CN116334331A - A blast furnace tuyere device and its small tuyere cover, tuyere middle cover and energy-saving method - Google Patents

Abstract

The invention relates to a blast furnace tuyere device, a tuyere small sleeve, a tuyere medium sleeve and an energy-saving method thereof, wherein the outer peripheral surface of the tuyere small sleeve extending into a blast furnace and the end surface of an outlet are provided with a first rare earth tantalate ceramic thermal barrier coating, or the outer peripheral surface of the tuyere small sleeve extending into the blast furnace and the end surface of the outlet are sequentially provided with the first rare earth tantalate ceramic thermal barrier coating and an ultrahigh temperature wear-resistant coating; through setting up the thermal barrier coating at the outer peripheral face and the export terminal surface of wind gap cover, can separate the heat and give circulating cooling water through the body conduction of wind gap cover to reduce the heat loss, the output heat of wind gap cover reduces under the separation of thermal barrier coating simultaneously, required cooling water volume and water supply pressure also reduce, consequently can reduce the heat that the wind gap cover cooling water took away and the power consumption of wind gap cover high pressure water supply, realize energy-conservation, reduce cost, reduce the probability that the wind gap cover was ablated, extension wind gap cover life avoids the unplanned damping down.

Description

A blast furnace tuyere device and its small tuyere cover, tuyere middle cover and energy-saving method

technical field

The invention relates to the technical field of blast furnace smelting, in particular to a blast furnace tuyere device, a small tuyere cover, a middle tuyere cover and an energy-saving method.

Background technique

Existing ironmaking blast furnaces use the tuyere to deliver hot air into the furnace. Since the installation and fixing points of the blast furnace tuyere are outside the furnace shell and the furnace wall is relatively thick, it is necessary to install three-layer tuyere sleeves to extend from the outside of the furnace shell to the furnace. The three-layer tuyere From the outside to the inside, the sleeves are respectively the large tuyere cover, the middle tuyere cover and the small tuyere cover. The large sleeve of the tuyere is in the shape of a conical tube, which is fixedly connected with the furnace body. The middle sleeve of the tuyere is in the shape of a conical tube, and the seal is set in the large hole of the tuyere. Part of it extends into the furnace body of the blast furnace. The middle tuyere and the small tuyere are equipped with cooling water chambers, and each has an independent water supply cooling system. The function of the blast furnace tuyere is to send hot air into the blast furnace. The front end of the small tuyere has a theoretical combustion temperature as high as 2000°C, and the melt temperature of the reaction product (slag iron) in the blast furnace is above 1500°C. Iron-phase contact, because the small tuyere sleeve of the blast furnace is "inserted" into the furnace, it needs to withstand the high temperature in the furnace, and the outlet end of the tuyere middle sleeve is also in direct contact with the high temperature in the furnace. Therefore, the small tuyere sleeve and the tuyere sleeve are designed with cooling The water cavity is cooled by water. In order to improve the cooling strength and cooling effect, the middle sleeve and the small sleeve of the general tuyere are made of pure copper. The area of the small tuyere jacket that directly contacts the high temperature in the furnace is relatively large, the cooling water required for the small tuyere jacket is larger, and the heat energy taken away is huge, and the cooling water in the tuyere jacket also takes away a lot of heat.

At the same time, the temperature of the hot air heated from the hot blast stove reaches 1100 ℃ ~ 1400 ℃. It is directly connected to the small tuyere sleeve through the direct blowing pipe. Walk.

Due to the large amount of high-pressure industrial pure cooling water required for the small tuyeres, the driving energy consumed by the water supply is also large.

When the small tuyere cover is inserted into the high-temperature furnace, slag and iron accumulate in front of the tuyere, which may easily cause the small tuyere cover to be burned. Or dripping high-temperature slag iron falls on the shell of the small tuyere sleeve, and burns or burns the small tuyere sleeve. In addition, the coal powder scouring is easy to wear the outlet section of the inner hole of the small sleeve. The effect of these factors causes the small sleeve to be damaged before it reaches the service life, and unplanned wind shutdown is a taboo in blast furnace production. Therefore, it is of great significance to reduce the damage of the tuyeres major.

At present, in order to reduce the burning loss of the tuyere sleeve, there is a plan to use ZrO ₂ type thermal barrier coating to spray 0.05mm to 0.1mm on the tuyere sleeve, and its thermal conductivity is about 2.0W/(m·K). It prevents the heat transfer from the high-temperature slag and iron dripping on the tuyere casing to the surface of the tuyere small casing copper, and greatly slows down, so as to achieve the purpose of preventing burning. However, the most widely used thermal barrier coating material is zirconia-based materials. When the high temperature reaches about 1200 degrees Celsius, a phase transition will occur, causing the coating to fall off and fail. Therefore, it is difficult for ZrO ₂ type thermal barrier coatings to continue to work stably under the working conditions of 1400-1600 degrees Celsius. It will completely peel off and fail. In addition, ZrO ₂ ceramics with a thickness of more than 0.1mm will peel off quickly in this working condition. The too thin thermal barrier layer prevents heat conduction from being limited, and it is difficult to continue to work stably. ZrO ₂ ceramics are not suitable as an energy-saving solution. A small set of coatings is used for the middle air outlet.

Taking a 3200m ³ blast furnace as an example, the blast furnace is equipped with 32 sets of blast furnace tuyere devices, the cooling water volume of each of the 32 small tuyere sets is 35t/h, and the normal temperature difference between the inlet and outlet of the cooling water chamber of the small tuyere sets is 6℃～ 8°C, based on an average of 7°C, when the cooling water rises by 1°C, the absorbed heat is 1000kcal/t, the heat value of blast furnace metallurgical coke is 8000×10 ³ kcal/t, and the combustion completion rate of blast furnace coke is 70%, then one The heat taken away by cooling water in a year is equivalent to the energy of 12,000 tons of metallurgical coke. The price of metallurgical coke is calculated at 3,000 yuan/t. ℃×1000kcal/t×360d×32 pcs ÷8000× ¹⁰³ kcal/t÷70%=12096t, 12096t×03,000 yuan/t=36.28 million yuan), in addition, the cooling water supply system of the tuyere small set is high-pressure water supply, The power of the motor is 1250kVA, the load rate is 75%, the annual power consumption is 8.1 million kWh, the electricity price is 0.5 yuan/kWh, and the value is 4 million yuan, (ie 1250kVA×75%×24h×360d/10000=8.1 million kWh , 8.1 million degrees × 0.5 yuan/degree = 4 million yuan).

The cooling water volume of each of the 32 tuyere jackets is 20t/h, and the normal temperature difference between the inlet and outlet of the tuyere jackets is 2°C to 4°C. Calculated on an average of 3°C, the heat taken away by the cooling water in a year is equivalent to about 3000t of metallurgical coke Energy, the value of heat taken away by cooling water in one year is about 9 million yuan, that is (20t/h×24h×3℃×1000kcal/t×360d×32 ÷8000×10 ³ kcal/t÷70%=2962t, 2962t ×0.3 million yuan/t=8.886 million yuan), different from the small tuyere casing, the cooling water supply system of the tuyere middle casing is a low-pressure water supply, and the motor power is small and has no energy-saving value.

It can be seen that the energy value of the heat energy taken away by the cooling water in the small tuyere and the middle tuyere and the energy value of the power consumption of the high-pressure water supply in the small tuyere are relatively high. It is an important technical problem to be solved urgently by those skilled in the art to reduce the cost of heat energy and the power consumption of high-pressure water supply in the small tuyere sleeve, and at the same time solve the problems of ablation and short life of the small tuyere sleeve and the tuyere middle sleeve, and avoid unplanned wind shutdown. .

Contents of the invention

The first object of the present invention is to provide a small tuyere sleeve to reduce the heat energy taken away by the cooling water of the small tuyere sleeve and the power consumption of the high-pressure water supply of the small tuyere sleeve, reduce the cost, and solve the ablation and life of the small tuyere sleeve at the same time Short questions to avoid unplanned breaks.

The second object of the present invention is to provide a jacket in the tuyere to reduce the heat energy taken away by the cooling water in the jacket in the tuyere, reduce the cost, and at the same time solve the problems of ablation and short life of the small jacket in the tuyere, and avoid unplanned wind shutdown .

The third object of the present invention is to provide a blast furnace tuyere device based on the above-mentioned small tuyere sleeve and tuyere middle sleeve.

The fourth object of the present invention is to provide an energy-saving method based on the blast furnace tuyere device.

To achieve the above object, the present invention provides the following technical solutions:

A small tuyere sleeve, the outer peripheral surface of the small tuyere sleeve extending into the blast furnace and the first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1 mm are provided on the outer peripheral surface of the blast furnace, or the small tuyere sleeve extends into A first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm and a first ultra-high temperature wear-resistant coating with a thickness of not less than 0.1mm are provided in sequence on the outer peripheral surface and the outlet end surface of the blast furnace.

Optionally, a second rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1 mm is provided on the wall surface of the air supply channel of the small tuyere sleeve, or, the wall surface of the air supply channel of the small tuyere sleeve is sequentially provided with a thickness not less than A 0.1mm second rare earth tantalate ceramic thermal barrier coating and a second ultra-high temperature wear-resistant coating with a thickness not less than 0.1mm.

Optionally, a transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the outer peripheral surface of the small tuyere sleeve, the outlet end surface and the first rare earth tantalate ceramic thermal barrier coating, and the supply of the small tuyere sleeve A transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the wall surface of the wind channel and the second rare earth tantalate ceramic thermal barrier coating.

Optionally, a base coating is provided between the first rare earth tantalate ceramic thermal barrier coating and the transition layer, and the base coating includes at least one layer of yttria-stabilized zirconia coating;

And/or, a base coating is provided between the second rare earth tantalate ceramic thermal barrier coating and the transition layer, and the base coating includes at least one layer of yttria-stabilized zirconia coating.

Optionally, the base coating includes a multi-layer yttria-stabilized zirconia coating and a multi-layer third rare earth tantalate ceramic thermal barrier coating, each of the yttria-stabilized zirconia coatings and each of the third Rare earth tantalate ceramic thermal barrier coatings are alternately stacked one on top of the other.

Optionally, a transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the first rare earth tantalate ceramic thermal barrier coating and the first ultra-high temperature wear-resistant coating;

And/or, a transition layer with a thickness of 0.1mm-0.2mm is provided between the second rare earth tantalate ceramic thermal barrier coating and the second ultra-high temperature wear-resistant coating.

Optionally, the first rare earth tantalate ceramic thermal barrier coating is a rare earth tantalate RETaO ₄ single-layer coating, a rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ double-layer coating, and a rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ three-layer coating; the second rare earth tantalate ceramic thermal barrier coating is a rare earth tantalate RETaO ₄ single layer coating, rare earth tantalum double-layer coating of RE ₃ TaO ₇ +RETaO ₄ and rare earth tantalate

One of the three RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ three-layer coatings.

Optionally, the first ultra-high temperature wear-resistant coating is one of SiC coating, SiN coating and Ni-based WC coating; the second ultra-high temperature wear-resistant coating is SiC coating , SiN coating and Ni-based WC coating one of the three.

A tuyere middle sleeve, the outlet end face of the tuyere middle sleeve is provided with a fourth rare earth tantalate ceramic thermal barrier coating with a thickness not less than 0.1 mm, or, the outlet end face of the tuyere middle sleeve is sequentially provided with a thickness not less than 0.1 mm The fourth rare earth tantalate ceramic thermal barrier coating and the third ultra-high temperature wear-resistant coating with a thickness of not less than 0.1 mm.

Optionally, a transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the outlet end face of the tuyere middle sleeve and the fourth rare earth tantalate ceramic thermal barrier coating.

Optionally, a base coating is provided between the fourth rare earth tantalate ceramic thermal barrier coating and the transition layer, and the base coating includes at least one layer of yttria-stabilized zirconia coating.

Optionally, the base coating includes a multi-layer yttria-stabilized zirconia coating and a multi-layer fifth rare earth tantalate ceramic thermal barrier coating, each of the yttria-stabilized zirconia coatings and each of the fifth Rare earth tantalate ceramic thermal barrier coatings are alternately stacked one on top of the other.

Optionally, a transition layer with a thickness of 0.1mm-0.2mm is provided between the fourth rare earth tantalate ceramic thermal barrier coating and the ultra-high temperature wear-resistant coating.

Optionally, the fourth rare earth tantalate ceramic thermal barrier coating is a rare earth tantalate RETaO ₄ single-layer coating, a rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ double-layer coating, and a rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ three-layer coating One of the three.

Optionally, the third ultra-high temperature wear-resistant coating is one of SiC coating, SiN coating and Ni-based WC coating.

A blast furnace tuyere device, comprising a large tuyere cover, a middle tuyere cover and a small tuyere cover connected in sequence, the small tuyere cover is the small tuyere cover as described in any one of the above, and the middle tuyere cover is the one described in any one of the above items. The above-mentioned tuyere is set in the middle.

An energy-saving method for a blast furnace tuyere device, comprising the steps of:

The first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1 mm is provided on the outer peripheral surface and the outlet end surface of the tuyere device of the blast furnace tuyere device, or the small tuyere device of the blast furnace device extends into The first rare-earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm and the first ultra-high temperature wear-resistant coating with a thickness of not less than 0.1mm are sequentially provided on the outer peripheral surface and the outlet end surface of the blast furnace;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere sleeve, and measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve in real time during use And obtain the real-time temperature difference of the cooling water at the inlet and outlet of the small tuyere, if the difference between the real-time temperature difference between the inlet and outlet of the cooling water of the small tuyere and the initial temperature difference between the cooling water at the inlet and outlet of the small tuyere is greater than the preset value, replace the small tuyere .

An energy-saving method for a blast furnace tuyere device, comprising the steps of:

Set the first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm on the outer peripheral surface and the outlet end surface of the tuyere of the blast furnace tuyere device and the air supply channel of the tuyere small sleeve of the blast furnace tuyere device The second rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm is installed on the wall, or the outer peripheral surface and the outlet end surface of the tuyere of the blast furnace tuyere device are installed in turn with a thickness of not less than 0.1mm. A rare-earth tantalate ceramic thermal barrier coating and the first ultra-high temperature wear-resistant coating with a thickness of not less than 0.1mm, and a second rare-earth coating with a thickness of not less than 0.1mm is sequentially arranged on the wall of the air supply channel of the tuyere small sleeve of the blast furnace tuyere device Tantalate ceramic thermal barrier coating and a second ultra-high temperature wear-resistant coating with a thickness of not less than 0.1 mm;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere sleeve, and measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve in real time during use And obtain the real-time temperature difference of the cooling water at the inlet and outlet of the small tuyere, if the difference between the real-time temperature difference between the inlet and outlet of the cooling water of the small tuyere and the initial temperature difference between the cooling water at the inlet and outlet of the small tuyere is greater than the preset value, replace the small tuyere .

An energy-saving method for a blast furnace tuyere device, comprising the steps of:

The fourth rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm is installed on the outlet end face of the tuyere middle sleeve of the blast furnace tuyere device, or the outlet end face of the tuyere middle sleeve of the blast furnace tuyere device is sequentially provided with a thickness not less than 0.1mm The fourth rare earth tantalate ceramic thermal barrier coating and the third ultra-high temperature wear-resistant coating with a thickness of not less than 0.1 mm;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the tuyere jacket in the initial stage of use and obtain the initial temperature difference between the inlet and outlet cooling water of the tuyere jacket, and measure the temperature of the inlet and outlet cooling water of the cooling water chamber of the tuyere jacket in real time during use And obtain the real-time temperature difference of the inlet and outlet cooling water of the tuyere jacket, if the difference between the real-time temperature difference of the inlet and outlet cooling water of the tuyere jacket and the initial temperature difference of the inlet and outlet cooling water of the tuyere jacket is greater than the preset value, replace the tuyere jacket .

An energy-saving method for a blast furnace tuyere device, comprising the steps of:

The first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1 mm is provided on the outer peripheral surface and the outlet end surface of the tuyere device of the blast furnace tuyere device, or the small tuyere device of the blast furnace device extends into The first rare-earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm and the first ultra-high temperature wear-resistant coating with a thickness of not less than 0.1mm are sequentially provided on the outer peripheral surface and the outlet end surface of the blast furnace;

The fourth rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm is installed on the outlet end face of the tuyere middle sleeve of the blast furnace tuyere device, or the outlet end face of the tuyere middle sleeve of the blast furnace tuyere device is sequentially provided with a thickness not less than 0.1mm The fourth rare earth tantalate ceramic thermal barrier coating and the third ultra-high temperature wear-resistant coating with a thickness of not less than 0.1 mm;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere sleeve, and measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve in real time during use And obtain the real-time temperature difference of the cooling water at the inlet and outlet of the small tuyere, if the difference between the real-time temperature difference between the inlet and outlet of the cooling water of the small tuyere and the initial temperature difference between the cooling water at the inlet and outlet of the small tuyere is greater than the preset value, replace the small tuyere ;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the tuyere jacket in the initial stage of use and obtain the initial temperature difference between the inlet and outlet cooling water of the tuyere jacket, and measure the temperature of the inlet and outlet cooling water of the cooling water chamber of the tuyere jacket in real time during use And obtain the real-time temperature difference of the inlet and outlet cooling water of the tuyere jacket, if the difference between the real-time temperature difference of the inlet and outlet cooling water of the tuyere jacket and the initial temperature difference of the inlet and outlet cooling water of the tuyere jacket is greater than the preset value, replace the tuyere jacket .

An energy-saving method for a blast furnace tuyere device, comprising the steps of:

Set the first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm on the outer peripheral surface and the outlet end surface of the tuyere of the blast furnace tuyere device and the air supply channel of the tuyere small sleeve of the blast furnace tuyere device The second rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm is installed on the wall, or the outer peripheral surface and the outlet end surface of the tuyere of the blast furnace tuyere device are installed in turn with a thickness of not less than 0.1mm. A rare-earth tantalate ceramic thermal barrier coating and an ultra-high temperature wear-resistant coating with a thickness of not less than 0.1mm, and a second rare-earth tantalate with a thickness of not less than 0.1mm is sequentially arranged on the wall of the air supply channel of the tuyere small sleeve of the blast furnace tuyere device Salt ceramic thermal barrier coating and the second ultra-high temperature wear-resistant coating with a thickness of not less than 0.1 mm;

The fourth rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm is installed on the outlet end face of the tuyere middle sleeve of the blast furnace tuyere device, or the outlet end face of the tuyere middle sleeve of the blast furnace tuyere device is sequentially provided with a thickness not less than 0.1mm The fourth rare earth tantalate ceramic thermal barrier coating and the third ultra-high temperature wear-resistant coating with a thickness of not less than 0.1 mm;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere sleeve, and measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere sleeve in real time during use And obtain the real-time temperature difference of the cooling water at the inlet and outlet of the small tuyere, if the difference between the real-time temperature difference between the inlet and outlet of the cooling water of the small tuyere and the initial temperature difference between the cooling water at the inlet and outlet of the small tuyere is greater than the preset value, replace the small tuyere ;

Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the tuyere jacket in the initial stage of use and obtain the initial temperature difference between the inlet and outlet cooling water of the tuyere jacket, and measure the temperature of the inlet and outlet cooling water of the cooling water chamber of the tuyere jacket in real time during use And obtain the real-time temperature difference of the inlet and outlet cooling water of the tuyere jacket, if the difference between the real-time temperature difference of the inlet and outlet cooling water of the tuyere jacket and the initial temperature difference of the inlet and outlet cooling water of the tuyere jacket is greater than the preset value, replace the tuyere jacket .

It can be seen from the above technical solutions that the present invention discloses a small tuyere sleeve, which is provided with a first rare earth tantalate ceramic thermal barrier with a thickness of not less than 0.1mm on the outer peripheral surface and the outlet end surface of the small tuyere sleeve extending into the blast furnace. coating, or, the outer peripheral surface of the tuyere sleeve extending into the blast furnace and the outlet end surface are sequentially provided with the first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1mm and the first ultra-high temperature resistant coating with a thickness of not less than 0.1mm. Grinding coating; the outer peripheral surface of the tuyere sleeve and the outlet end surface are the main contact surfaces that extend into the blast furnace, and are also the main heat-absorbing surfaces. It is a durable and stable ultra-high temperature thermal barrier coating, which has the performance of working stably above 2600°C for a short time (1h) and above 1600°C for a long time (12000h-16000h). The end face is equipped with the first rare earth tantalate ceramic thermal barrier coating, which can prevent heat from being transmitted from the blast furnace at 1400 ° C to 1600 ° C to the circulating cooling water through the body of the tuyere sleeve, thereby greatly reducing heat loss, and at the same time the output of the tuyere sleeve The heat is greatly reduced by the barrier of the first rare earth tantalate ceramic thermal barrier coating, the required cooling water volume is also greatly reduced, and the required water supply pressure is also reduced, so the heat energy taken away by the cooling water of the tuyere small set can be reduced and The power consumption of the high-pressure water supply in the tuyere small set can save energy and reduce the cost. It is foreseeable that the first rare earth tantalate ceramic thermal barrier coating is susceptible to wear in the dusty air supply operation, and its wear will make its heat barrier ability Decrease, in order to make the first rare earth tantalate ceramic thermal barrier coating have a certain wear resistance, the thickness of the rare earth tantalate ceramic thermal barrier coating can be increased to more than 0.6mm. Grind to 0.2mm and replace it, and obtain the wear condition of the first rare earth tantalate ceramic thermal barrier coating by detecting the temperature difference between the inlet and outlet cooling water under the same working condition; or on the first rare earth tantalate ceramic thermal barrier coating The first ultra-high temperature wear-resistant coating is added to protect the first rare earth tantalate ceramic thermal barrier coating to maintain its long-lasting and efficient heat barrier performance. It can be seen that when the tuyere small sleeve is replaced, the first rare earth tantalate ceramic thermal barrier coating The barrier coating is still 0.2mm, and the probability of the small tuyere sleeve being ablated is extremely low, thereby prolonging the service life of the small tuyere sleeve and avoiding unplanned wind shutdown.

The present invention also provides a tuyere jacket, a blast furnace tuyere device and an energy-saving method thereof. The technical effects of the tuyere middle jacket, blast furnace tuyere device and the energy-saving method are similar to those of the above-mentioned small tuyere jacket, and will not be repeated here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a cross-sectional view of a small tuyere cover provided by an embodiment of the present invention;

Fig. 2 is the partially enlarged schematic diagram of place A in Fig. 1;

Fig. 3 is a cross-sectional view of a small tuyere cover provided by another embodiment of the present invention;

Fig. 4 is the partially enlarged schematic diagram of place B in Fig. 3;

Fig. 5 is a cross-sectional view of a small tuyere cover provided by another embodiment of the present invention;

Fig. 6 is a partially enlarged schematic diagram of place C in Fig. 5;

Fig. 7 is a cross-sectional view of a sleeve in the tuyere provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a blast furnace tuyere device provided by an embodiment of the present invention.

In the picture:

1 is the small tuyere cover; 101 is the outer peripheral surface of the small tuyere cover; 102 is the outlet end face of the small tuyere cover; 103 is the wall surface of the air supply channel of the small tuyere cover; 2a is the first rare earth tantalate ceramic thermal barrier coating; 2b is the second rare earth tantalate ceramic thermal barrier coating; 2c is the fourth rare earth tantalate ceramic thermal barrier coating; 3a is the first ultra-high temperature wear-resistant coating; 3b is the second ultra-high temperature wear-resistant coating; 3c 4 is the tuyere middle cover; 401 is the outlet end face of the tuyere middle cover; 402 is the outer peripheral surface of the tuyere middle cover; 5 is the tuyere large cover.

Detailed ways

The first core of the present invention is to provide a small tuyere cover, the structure design of the small tuyere can reduce the waste of water resources, and recover the waste heat in the slag, improve the energy utilization rate, reduce the amount of slag produced, and facilitate the subsequent treatment and transportation, while facilitating the separation of slag and metal.

The second core of the present invention is to provide a jacket in the tuyere to reduce the heat energy taken away by the cooling water in the jacket in the tuyere, reduce the cost, and at the same time solve the problems of ablation and short life of the small jacket in the tuyere, and avoid unplanned wind shutdown.

The third core of the present invention is to provide a blast furnace tuyere device based on the above-mentioned small tuyere sleeve and tuyere middle sleeve.

The fourth core of the present invention is to provide an energy-saving method based on the blast furnace tuyere device.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1 and Fig. 2, Fig. 1 is a cross-sectional view of a small tuyere cover provided by an embodiment of the present invention, Fig. 2 is a partially enlarged schematic diagram of A in Fig. 1, and Fig. 3 is provided by another embodiment of the present invention The cross-sectional view of the small tuyere sleeve, Fig. 4 is a partial enlarged schematic diagram of B in Fig. 3 .

The embodiment of the present invention discloses a small tuyere sleeve 1, the outer peripheral surface 101 and the outlet end surface 102 of the small tuyere sleeve 1 extending into the blast furnace are provided with a first rare earth tantalate ceramic thermal barrier coating with a thickness not less than 0.1 mm 2a, or, the outer peripheral surface 101 and the outlet end surface 102 of the small tuyere sleeve 1 protruding into the blast furnace are sequentially provided with a first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1 mm and a first rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1 mm. Ultra-high temperature wear-resistant coating 3a.

In order to improve the cooling strength and cooling effect, the general small tuyere 1 is made of pure copper. The outer peripheral surface 101 and the outlet end surface 102 of the small tuyere 1 are the main contact surfaces extending into the blast furnace and also the main heat-absorbing surface. Rare earth tantalum Salt ceramic coating is currently the only thermal barrier coating that can work stably for a long time at a temperature of 1400°C to 1600°C. work performance.

The wall thickness of the small tuyere 1 made of red copper is about 15mm, and it will be thinner during use. The temperature difference between the inlet and outlet of the cooling water chamber of the small tuyere 1 is generally 6°C to 8°C when the temperature is normal, and the thermal conductivity of red copper is 407W/ (m K), and the thermal conductivity of the first rare earth tantalate ceramic thermal barrier coating 2a is 1.2W/(m K), when the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a is 0.02mm When the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a is 0.05mm, it can theoretically prevent the heat loss of this part from being reduced by 53%. When the tantalate ceramic thermal barrier coating 2a is 0.1mm, it can theoretically prevent the heat loss of this part from reducing by 69%. From the following calculation formula, we can see that the first rare earth tantalate ceramic With the increase of thermal barrier coating 2a, the amount of influence is getting smaller and smaller. We choose 0.2mm as the base thickness of the scheme, which is also the lower limit thickness of the residual thermal barrier coating of the energy-saving tuyere. The preferred 0.6mm is the first rare earth tantalum acid for the energy-saving tuyere. The prepared thickness of the salt ceramic thermal barrier coating 2a. During operation, the coating will be washed by steel slag and dust, and will gradually wear out. When the wear reaches around 0.2mm, the energy-saving effect will decline, and it can be replaced in time. The tuyere.

【0.6mm×407W/(m·K)÷1.2W/(m·K)】/【0.6mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝93%

【0.5mm×407W/(m·K)÷1.2W/(m·K)】/【0.5mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝0.92%

【0.4mm×407W/(m·K)÷1.2W/(m·K)】/【0.4mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝90%

【0.3mm×407W/(m·K)÷1.2W/(m·K)】/【0.3mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝87%

【0.2mm×407W/(m·K)÷1.2W/(m·K)】/【0.2mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝82%

【0.1mm×407W/(m·K)÷1.2W/(m·K)】/【0.1mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝69%

【0.05mm×407W/(m·K)÷1.2W/(m·K)】/【0.05mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝53%

【0.02mm×407W/(m·K)÷1.2W/(m·K)】/【0.02mm×407W/(m·K)÷1.2W/(m·K)+15mm】＝31%

Because the heat absorption of the outer peripheral surface 101 and the outlet end face 102 of the small tuyere 1 extending into the blast furnace furnace accounts for 70% of the small tuyere 1, the inner wall 103 of the air supply channel accounts for 25%, and the remaining 5%. 1 The outer peripheral surface 101 and the outlet end surface 102 extending into the blast furnace are sprayed with the above-mentioned first rare earth tantalate ceramic thermal barrier coating 2a and kept above 0.2mm, which can reduce the energy loss of the small tuyere 1 by 82%×70 % = 57.4%, wear from 0.6mm to 0.2mm, during which the average reduction of heat loss in this part is roughly calculated as (82% + 87% + 90% + 92% + 93%) / 5 = 88.8%, then the small tuyere can be reduced 62% of the energy loss of cover 1 (i.e. 88.8%×70%=62%), as adding the air supply passage wall 103, theoretically can reduce 84% of the energy loss of the tuyere small set 1 (i.e. 88.8%×95%= 84%), other factors adjustment correction data, the implementation of this program can reduce 70% of the energy loss of tuyere small set 1 (promptly 84% * 85% = 71.4%).

The water supply volume of the small tuyere 1 is large, the cross-sectional area of the cooling pipe of the small tuyere 1 is small, the flow rate is large, and high-pressure water supply is required, and the power consumption of the water supply also increases accordingly. When the cooling water of the small tuyere 1 absorbs heat greatly When the reduction is calculated by 70%, when using the small tuyere 1 provided by the embodiment of the present invention, if the temperature difference between the inlet and outlet of the cooling water is still controlled at 6°C to 8°C, the water supply can be reduced by 70%, and the flow rate of the cooling water can be reduced by 70%. %, theoretically the water supply power can be reduced by 90%. Taking the 3200m ³ blast furnace as an example, the water supply motor of the original tuyere small set 1 is 1250kVA, and the load rate is calculated as 75%. The hourly power saving can be 1250kVA×0.75%×90%= 843.7Kw.

The energy saving estimate of the present invention, taking a 3200m ³ blast furnace as an example, can reduce the heat loss of cooling water throughout the year, and the cost of energy saving can reach 36 million yuan × 70% + 4 million yuan × 90% + 9 million yuan × 57% = 3393 10,000 yuan/year, considering that the uncontrollable factors on site cannot fully realize the state of high efficiency and energy saving, the energy-saving funds can reach 25-30 million yuan/year.

In summary, compared with the prior art, the tuyere cover 1 provided by the embodiment of the present invention can block heat from 1400°C to The inside of the 1600°C blast furnace is conducted to the circulating cooling water through the body of the small tuyere 1, thereby greatly reducing heat loss. At the same time, the output heat of the small tuyere 1 is greatly reduced under the barrier of the first rare earth tantalate ceramic thermal barrier coating 2a , the amount of cooling water required is also greatly reduced, and the required water supply pressure is also reduced. Therefore, the heat energy taken away by the cooling water of the small tuyere 1 and the power consumption of the high-pressure water supply of the small tuyere 1 can be reduced, energy saving and cost reduction can be achieved. It is foreseeable that the first rare earth tantalate ceramic thermal barrier coating 2a is susceptible to wear in the dusty air supply operation, and its wear will reduce its heat barrier ability. This scheme is to make the first rare earth tantalate ceramic thermal barrier The coating 2a has a certain wear resistance, and the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a can be increased to more than 0.6mm by increasing the thickness, and it can be replaced when it is ground to 0.2mm; The first ultra-high temperature wear-resistant coating 3a is added to the rare earth tantalate ceramic thermal barrier coating 2a to protect the first rare earth tantalate ceramic thermal barrier coating 2a so as to maintain its long-lasting and efficient heat barrier performance. The temperature difference between the inlet and outlet cooling water under the condition can obtain the first rare earth tantalate ceramic thermal barrier coating 2a or the wear condition of the first rare earth tantalate ceramic thermal barrier coating 2a and the first ultra-high temperature wear-resistant coating 3a, which can be seen when When the small tuyere cover 1 is replaced, the first rare earth tantalate ceramic thermal barrier coating 2a is still 0.2mm, so that the thickness of the first rare earth tantalate ceramic thermal barrier coating 2a to block heat can be guaranteed within a certain period of time. (for example, the preferred minimum of 6 months, preferably more than 12 months) is sufficient to maintain long-term energy-saving and high efficiency. Unplanned break.

In addition to the outer surface of the small tuyere 1, hot air at 1100°C to 1400°C is blown into the blast furnace through the wall 103 of the air supply channel of the small tuyere 1, and the high-temperature hot air meets the holes on the wall 103 of the air supply channel of the small tuyere 1 wall contact, the heat is transferred to the circulating cooling water through the small tuyere 1 and is lost. The heat absorbed by the outer peripheral surface and the outlet end surface of the small tuyere 1 extending into the blast furnace accounts for 70% of the heat absorbed by the small tuyere 1, and the wall surface 103 of the air supply channel accounts for 25%, and the remaining 5%. Therefore, in another embodiment of the present invention, the second rare earth tantalate ceramic thermal barrier coating 2b with a thickness of not less than 0.1 mm is provided on the wall surface 103 of the air supply channel of the tuyere sleeve 1, or The wall surface 103 of the air supply channel of the small tuyere 1 is sequentially provided with a second rare earth tantalate ceramic thermal barrier coating 2b with a thickness of not less than 0.1mm and a second ultra-high temperature wear-resistant coating 3b with a thickness of not less than 0.1mm.

Preferably, in the embodiment of the present invention, as shown in Fig. 5 and Fig. 6, a thickness of The transition layer is 0.1 mm to 0.2 mm, and the thickness is set to 0.1 mm between the wall surface 103 of the air supply channel of the small tuyere sleeve and the second rare earth tantalate ceramic thermal barrier coating 2b

~0.2mm transition layer, the transition layer is Al, Cr, Ni, Co, Y component materials, in addition, in order to prevent the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic The thermal barrier coating 2b fails, and the total thickness of the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating 2b is increased to 0.6mm, and because the first rare earth tantalum The salt ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating 2b is easy to peel off, so the first rare earth tantalate ceramic thermal barrier coating 2a or the second rare earth tantalate ceramic thermal barrier coating can be used Layer 2b is coated alternately with the transition layer, that is, the rare earth tantalate ceramic thermal barrier coating layer (0.1mm) + transition layer (0.1mm) is superimposed and thickened, and the apparent total thickness is 1.2mm. The thickness of the transition layer is not included in the thickness of the rare earth tantalate ceramic thermal barrier coating.

Preferably, in the embodiment of the present invention, in order to reduce the cost, a basic coating is provided between the first rare earth tantalate ceramic thermal barrier coating 2a and the transition layer, and the basic coating includes at least one layer of yttria stabilized zirconia coating. layer; and/or, a base coating is provided between the second rare earth tantalate ceramic thermal barrier coating 2b and the transition layer, and the base coating includes at least one layer of yttria-stabilized zirconia coating.

Further, the above basic coating includes a multilayer yttria stabilized zirconia coating and a multilayer third rare earth tantalate ceramic thermal barrier coating, each yttria stabilized zirconia coating and each third rare earth tantalate ceramic thermal barrier coating The barrier coatings are alternately stacked one on top of the other.

To further optimize the above technical solution, in the embodiment of the present invention, a transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the first rare earth tantalate ceramic thermal barrier coating 2a and the first ultra-high temperature wear-resistant coating 3a, And/or, a transition layer with a thickness of 0.1mm-0.2mm is provided between the second rare earth tantalate ceramic thermal barrier coating 2b and the second ultra-high temperature wear-resistant coating 3b.

The above-mentioned first rare earth tantalate ceramic thermal barrier coating 2a and the second rare earth tantalate ceramic thermal barrier coating 2b include but are not limited to rare earth tantalate RETaO ₄ single-layer coating, rare earth tantalate RE ₃ TaO ₇ + RETaO ₄ double layer coating and rare earth tantalate

RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ three-layer coating, the above three rare earth tantalate ceramic thermal barrier coatings can withstand high temperatures above 2000℃～2400℃ for a short time (3h), and can withstand high temperatures above 2000℃～2400℃ for a long time (12000h～ 16000h) can work stably in a high-temperature environment of 1500°C to 1600°C, and has anti-corrosion performance under high-temperature redox and multiple environments, as well as anti-stripping and certain high-temperature anti-wear capabilities.

Preferably, in the embodiment of the present invention, the above-mentioned first ultra-high temperature wear-resistant coating 3a includes but not limited to SiC coating, SiN coating and Ni-based WC coating, and the above-mentioned second ultra-high temperature wear-resistant coating 3b includes But not limited to SiC coating, SiN coating and Ni-based WC coating.

The embodiment of the present invention also provides a jacket 4 in the tuyere. As shown in FIG. The end face 401 is provided with a fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness of not less than 0.1 mm, or the outlet end face of the tuyere middle sleeve 4 is sequentially provided with a fourth rare earth tantalate ceramic thermal barrier coating with a thickness of not less than 0.1 mm 2c and the third ultra-high temperature wear-resistant coating 3c with a thickness of not less than 0.1mm, so as to maintain the performance of the fourth rare earth tantalate ceramic thermal barrier coating 2c to block heat transmission efficiently and permanently.

The outlet end surface 401 of the tuyere middle sleeve 4 accounts for 75% of the total heat absorption of the tuyere middle sleeve 4, and the heat absorption of the gap between the tuyere middle sleeve 4 outer peripheral surface 402 and the steel brick of the furnace wall accounts for about 75% of the tuyere middle sleeve 4’s total heat absorption. 20%, but the thermal barrier coating shall not be used in this gap, because the steel slag flows into the gap, rapidly cools and solidifies, and plays the role of fixing the middle sleeve 4 of the tuyere. If the gap is provided with a rare earth tantalate ceramic thermal barrier coating , will affect the solidification of steel slag. When the furnace collapses, a large amount of steel slag will impact the tuyere, and the sleeve 4 in the tuyere will shift if it is unstable, resulting in a change in the direction of the tuyere. Therefore, the theoretical energy saving of the sleeve 4 in the tuyere is about 67 %(88.8%×75%=67%), other factors adjustment and correction data, the implementation of this scheme can reduce 57% (67%×85%=57%) of the energy loss of cover 4 in the tuyere.

Preferably, in the embodiment of the present invention, a transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the outlet end face 401 of the tuyere middle sleeve 4 and the fourth rare earth tantalate ceramic thermal barrier coating 2c, and the transition layer is Al , Cr, Ni, Co, Y component materials.

Preferably, in the embodiment of the present invention, a transition layer with a thickness of 0.1 mm to 0.2 mm is provided between the fourth rare earth tantalate ceramic thermal barrier coating 2c and the third ultra-high temperature wear-resistant coating 3c, when the fourth When the required thickness of the rare earth tantalate ceramic thermal barrier coating 2c is relatively thick, the fourth rare earth tantalate ceramic thermal barrier coating 2c can be divided into multiple layers and multi-layer transition layers alternately stacked to avoid excessive thickness The fourth rare earth tantalate ceramic thermal barrier coating 2c is easy to peel off.

Preferably, in order to reduce costs, in the embodiment of the present invention, a basic coating is provided between the fourth rare earth tantalate ceramic thermal barrier coating 2c and the transition layer, and the basic coating includes at least one layer of yttria-stabilized zirconia coating. layer.

Specifically, the above basic coating includes a multilayer yttria stabilized zirconia coating and a multilayer fifth rare earth tantalate ceramic thermal barrier coating, each yttria stabilized zirconia coating and each fifth rare earth tantalate ceramic thermal barrier coating The barrier coatings are alternately stacked one on top of the other.

The above fourth rare earth tantalate ceramic thermal barrier coating 2c includes but not limited to rare earth tantalate RETaO ₄ single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ double layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ three-layer coating, the above three rare earth tantalate ceramic thermal barrier coatings can withstand high temperatures above 2000℃～2400℃ for a short time (3h), and can withstand high temperatures for a long time (12000h～16000h) It can work stably in a high-temperature environment of 1500°C to 1600°C, and has anti-corrosion performance under high-temperature redox environments, as well as anti-stripping and certain high-temperature anti-wear capabilities.

Preferably, in the embodiment of the present invention, the third ultra-high temperature wear-resistant coating 3c includes but not limited to SiC coating, SiN coating and Ni-based WC coating.

The embodiment of the present invention also provides a blast furnace tuyere device, the blast furnace tuyere device includes a tuyere large cover 5, a tuyere middle cover 4 and a tuyere small cover 1 connected in sequence, wherein the tuyere small cover 1 is as described in the above embodiment The small tuyere cover 1 and the middle cover 4 of the tuyere are the middle cover 4 of the tuyere as described in the above-mentioned embodiment, so please refer to the above-mentioned embodiment for the technical effect of the blast furnace tuyere device.

In one embodiment of the present invention, a method for energy saving of a blast furnace tuyere device is provided, comprising the steps of:

S101: Install the first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1 mm on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere device 1 of the blast furnace tuyere device, or, on the tuyere device of the blast furnace The outer peripheral surface 101 and the outlet end surface 102 of the small tuyere sleeve 1 extending into the blast furnace are provided with the first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1mm and the first ultra-high temperature resistant coating with a thickness of not less than 0.1mm. Grinding coating 3a;

The above-mentioned first rare earth tantalate ceramic thermal barrier coating 2a includes but not limited to rare earth tantalate RETaO ₄ single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ double layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ three-layer coating, when the thickness of the above-mentioned rare earth tantalate ceramic thermal barrier coating is 0.3mm, it can show a very ideal heat insulation effect, and the coal powder and slag iron in the furnace Under the action of turbulence, the dust scours the outer peripheral surface 101 and the outlet end surface 102 of the small tuyere 1. The effect of these factors makes the first rare earth tantalate ceramic thermal barrier coating 2a at this position of the small tuyere 1 wear and tear. The energy-saving efficiency decreases. Therefore, with the help of the first rare earth tantalate ceramic thermal barrier coating 2a, which has ultra-high temperature wear resistance, the coating is increased from the effective 0.3mm thickness to 0.6mm-1mm thick, and the coating is replaced by 0.2mm. The allowable wear amount is increased from 0.1mm to 0.4mm to 0.8mm to ensure long-lasting and efficient savings.

It can be understood that when the small tuyere 1 is inserted into the blast furnace, slag and iron accumulate in front of the tuyere, which may easily cause the small tuyere 1 to be burned, or drip high-temperature slag and iron to fall on the upper part of the tuyere 1 casing, causing burning or Burn out the small set of tuyere 1. The first rare earth tantalate ceramic thermal barrier coating 2a can effectively prevent the small tuyere 1 from being burned, but in addition, the coal powder and slag iron dust in the furnace will wash the outer peripheral surface 101 of the tuyere 1 under the action of turbulent flow and the outlet end face, the effect of these factors makes the first rare earth tantalate ceramic thermal barrier coating 2a at this position of the small tuyere 1 easy to wear and fail, and the body of the small tuyere 1 is damaged in advance before reaching the end of its service life. Therefore, in an embodiment of the present invention, on the basis of the first rare earth tantalate ceramic thermal barrier coating 2a of the tuyere small sleeve 1, a first ultra-high temperature wear-resistant coating is added Coating 3a, the first rare earth tantalate ceramic thermal barrier coating 2a is protected from rapid wear by the first ultra-high temperature wear-resistant coating 3a, so that the heat insulation effect of the first rare earth tantalate ceramic thermal barrier coating 2a remains In order to be efficient and durable, it also prolongs the service life of the small tuyere cover 1.

S102: Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere 1 at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere 1, and measure the inlet and outlet cooling water chamber of the small tuyere 1 in real time during use The outlet cooling water temperature and obtain the real-time temperature difference between the inlet and outlet cooling water of the small tuyere 1. If the value is set, replace the air outlet cover 1.

The heat output of the small tuyere 1 is mainly due to the contact of the outer peripheral surface 101 and the outlet end surface 102 with the high temperature inside the blast furnace, and the heat output of the outer peripheral surface 101 and the outlet end surface 102 of the tuyere 1 accounts for 80% of the total heat output of the tuyere 1 , taking a 3200m ³ blast furnace as an example to conduct heat conduction energy-saving evaluation and calculation: the thickness of rare earth tantalate ceramic thermal barrier coating 2a is 0.6mm, and the thermal conductivity is equivalent to the thickness of copper 0.6mm×407W/(m·K)÷1.2 W/(m·K)=203.5mm thick, and the wall thickness of the cooling cavity of the small tuyere 1 is 15mm, then the theoretical reduction of heat conduction is 203.5mm/(203.5mm+15mm)×70%=0.65%, and the difference is adjusted according to the heat conduction An average reduction of 50% to 55% can reduce the cooling water temperature difference by about 3°C (the actual water temperature difference is generally between 6°C and 8°C).

Taking a 3200m ³ blast furnace as an example, the normal water volume of the cooling water channel of each small tuyere 1 is about 35t/h, and there are 32 channels. The cooling water volume of the small tuyere 1 is about 1120t/h, and the energy saving is about 1120t based on a temperature difference of 3°C /h×1000kcal/t×3℃＝3360× ¹⁰³ kcal/h, the calorific value of blast furnace metallurgical coke is 8000× ¹⁰³ kcal/t, the combustion completion rate of coke is 70%, and coke is saved by 3360 ×10 ³ kcal/h÷(8000×10 ³ kcal/t×70%)＝0.6t/h, then a 3200m ³ blast furnace’s annual metallurgical coke is about 0.6t/h×24h×360d＝ 5184t.

The outlet water temperature of each tuyere 1 is measured separately, and the temperature difference between it and the inlet water is recorded. 2°C～4°C), if the outlet water temperature of a small tuyere 1 rises abnormally, exceeding the average temperature difference of 1°C from the original outlet (for example, if the average water temperature difference from the original outlet is 0.8°C, When the temperature difference is 1.8°C, and it shows an upward trend), then the energy saving of the small tuyere cover 1 is considered to be significantly reduced, and the small tuyere cover 1 should be replaced at this time.

It should be noted that in order to ensure the energy-saving and high efficiency of the small tuyere 1, the small tuyere 1 that is energy-saving in the low-efficiency state should be replaced in time, but the replacement timing of the small tuyere 1 needs to be consistent with the planned shutdown of the blast furnace. Therefore, timely Accurately know the status of the small tuyere cover 1, appropriately advance or delay the replacement of the small tuyere cover 1 synchronously with the planned wind break.

In another embodiment of the present invention, another energy-saving method for a blast furnace tuyere device is provided, comprising the steps of:

S201: Install the first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1mm on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 of the blast furnace tuyere device extending into the blast furnace, and on the wall surface 103 of the air supply channel Install the second rare earth tantalate ceramic thermal barrier coating 2b with a thickness of not less than 0.1 mm, or set the thickness of not less than 0.1 mm of the first rare earth tantalate ceramic thermal barrier coating 2a and the first ultra-high temperature wear-resistant coating 3a with a thickness of not less than 0.1 mm, the wall surface 103 of the air supply channel of the tuyere small sleeve 1 of the blast furnace tuyere device is sequentially provided with a thickness of not less than 0.1 mm. A second rare earth tantalate ceramic thermal barrier coating 2b less than 0.1mm in thickness and a second ultra-high temperature wear-resistant coating 3b with a thickness not less than 0.1mm.

The difference from the above embodiments is that the wall surface 103 of the air supply channel is provided with the second rare earth tantalate ceramic thermal barrier coating 2b, because when the hot air at 1100°C-1400°C passes through the air supply channel, a large amount of heat will pass through the wall surface of the air supply channel 103 exchanges heat with the cooling water, and is taken away by the circulating cooling water in the tuyere small cover 1 (the tuyere small cover 1 takes away 25% of the total amount of heat). By adding a second rare earth tantalate ceramic thermal barrier coating 2b on the wall surface 103 of the air supply channel of the small tuyere 1, the heat output through the surface of the inner hole of the air supply channel is blocked, and the second ultra-high temperature wear-resistant coating 3b can Protect the second rare earth tantalate ceramic thermal barrier coating 2b from abrasion.

S202: Measure the temperature of the cooling water at the inlet and outlet of the cooling water cavity of the small tuyere 1 at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere 1, and measure the inlet and outlet cooling water of the small tuyere 1 in real time during use The outlet cooling water temperature and obtain the real-time temperature difference between the inlet and outlet cooling water of the small tuyere 1. If the value is set, replace the air outlet cover 1.

Compared with the previous embodiment, by setting the second rare earth tantalate ceramic thermal barrier coating 2b on the wall of the air supply channel of the small tuyere 1, the small tuyere 1 can increase the thermal resistance of the heated part by another 20%, with the same In terms of performance, compared with the previous embodiment, taking a 3200m ³ blast furnace as an example, 5184t×20%÷80%=1296t, which can increase the energy saving of metallurgical coke by about 1300t throughout the year.

In the tuyere 1 part of this embodiment, taking a 3200m ³ blast furnace as an example, about 6500t (5184t+1296t) of metallurgical coke can be saved throughout the year.

In yet another embodiment of the present invention, a method for energy saving of a blast furnace tuyere device is provided, comprising the steps of:

S301: Install a fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness not less than 0.1mm on the outlet end face 401 of the middle sleeve 4 of the tuyere device of the blast furnace, or, on the outlet end face of the middle sleeve 4 of the tuyere device of the blast furnace in sequence Install the fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness not less than 0.1mm and the third ultra-high temperature wear-resistant coating 3c with a thickness not less than 0.1mm;

Different from the above-mentioned embodiment, in this embodiment, the fourth rare earth tantalate ceramic thermal barrier coating 2c is provided on the outlet end face of the tuyere middle sleeve 4. It can be understood that the outlet end face 401 of the tuyere middle sleeve 4 also directly faces the furnace Inside, this is the largest heating surface of the tuyere jacket 4, accounting for about 80% of the total heat received by the tuyere jacket 4, so the fourth rare earth tantalate ceramic thermal barrier coating is also added to the outlet end face 401 of the tuyere jacket 4 2c, while the third ultra-high temperature wear-resistant coating 3c can protect the fourth rare earth tantalate ceramic thermal barrier coating 2c, and keep the thermal barrier coating's performance of blocking heat transmission efficient and durable.

S302: Measure the temperature of the cooling water at the inlet and outlet of the cooling water cavity of the jacket 4 in the tuyere at the initial stage of use and obtain the initial temperature difference between the inlet and outlet cooling water of the jacket 4 in the tuyere, and measure the inlet and outlet cooling water chamber of the jacket 4 in the tuyere in real time during use The outlet cooling water temperature and the real-time temperature difference between the inlet and outlet cooling water of tuyere jacket 4 are obtained. Set the value, then change the cover 4 in the tuyere.

Taking a 3200m ³ blast furnace as an example, the cooling water volume of each of the 32 tuyeres 4 is 20t/h. After using the rare earth tantalate ceramic thermal barrier coating 2c, the temperature difference between the inlet and outlet of the cooling water drops by 1°C in the whole cycle, 32 x 20t/h×1000kcal/t=640× ¹⁰³ kcal/h, the calorific value of blast furnace metallurgical coke is 8000× ¹⁰³ kcal/t, and the completion rate of coke combustion in blast furnace is 70%, saving 640×10 coke ³ kcal/h÷(8000×10 ³ kcal/t×60%)=0.133t/h, then the annual coke savings of a 3200m ³ blast furnace is 0.133t/h×24h×360d=1150t.

In yet another embodiment of the present invention, a method for energy saving of a blast furnace tuyere device is provided, which is different from the above embodiment in that this embodiment is provided with a The first rare-earth tantalate ceramic thermal barrier coating 2a and the fourth rare-earth tantalate ceramic thermal barrier coating 2c are provided on the outlet end face 401 of the tuyere middle sleeve 4, including steps:

S401: Install the first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1mm on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere device 1 of the blast furnace tuyere device, or on the tuyere device of the blast furnace The outer peripheral surface 101 and the outlet end surface 102 of the small tuyere sleeve 1 extending into the blast furnace are provided with the first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1mm and the first ultra-high temperature resistant coating with a thickness of not less than 0.1mm. Grinding coating 3a;

S402: Install the fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness not less than 0.1 mm on the outlet end face 401 of the middle sleeve 4 of the blast furnace tuyere device, or, on the outlet end face 401 of the middle sleeve 4 of the blast furnace tuyere device The fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness of not less than 0.1mm and the third ultra-high temperature wear-resistant coating 3c with a thickness of not less than 0.1mm are provided in sequence;

S403: Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere 1 at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere 1, and measure the inlet and outlet cooling water chamber of the small tuyere 1 in real time during use The outlet cooling water temperature and obtain the real-time temperature difference between the inlet and outlet cooling water of the small tuyere 1. If the value is set, replace the air outlet cover 1;

S404: Measure the temperature of the cooling water at the inlet and outlet of the cooling water cavity of the jacket 4 in the tuyere at the initial stage of use and obtain the initial temperature difference between the inlet and outlet cooling water of the jacket 4 in the tuyere, and measure the inlet and outlet cooling water chamber of the jacket 4 in the tuyere in real time during use The outlet cooling water temperature and the real-time temperature difference between the inlet and outlet cooling water of tuyere jacket 4 are obtained. Set the value, then change the cover 4 in the tuyere.

In the last embodiment of the present invention, a method for energy saving of blast furnace tuyere device is provided, which is different from the above embodiments in that the first rare earth tantalum is provided on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere sleeve 1 Salt ceramic thermal barrier coating 2a, the second rare earth tantalate ceramic thermal barrier coating 2b is set on the wall surface 103 of the air supply channel of the tuyere small sleeve 1 and the fourth rare earth tantalum tantalum is set on the outlet end face 401 of the tuyere middle sleeve 4 Salt ceramic thermal barrier coating 2c, including steps:

S501: Install the first rare-earth tantalate ceramic thermal barrier coating 2a with a thickness not less than 0.1mm on the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 of the blast furnace tuyere device, which extends into the blast furnace The wall surface 103 of the air supply channel is provided with a second rare earth tantalate ceramic thermal barrier coating 2b with a thickness of not less than 0.1mm, or the outer peripheral surface 101 and the outlet end surface 102 of the tuyere small sleeve 1 of the blast furnace tuyere device extending into the blast furnace Install the first rare earth tantalate ceramic thermal barrier coating 2a with a thickness of not less than 0.1mm and the first ultra-high temperature wear-resistant coating 3a with a thickness of not less than 0.1mm, and set the thickness on the wall surface 103 of the air supply channel of the small tuyere 1 in sequence A second rare earth tantalate ceramic thermal barrier coating 2b not less than 0.1mm in thickness and a second ultra-high temperature wear-resistant coating 3b not less than 0.1mm in thickness;

S502: Install a fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness not less than 0.1 mm on the outlet end face 401 of the middle sleeve 4 of the tuyere device of the blast furnace, or, on the outlet end face of the middle sleeve 4 of the tuyere device of the blast furnace in sequence Install the fourth rare earth tantalate ceramic thermal barrier coating 2c with a thickness not less than 0.1mm and the third ultra-high temperature wear-resistant coating 3c with a thickness not less than 0.1mm;

S503: Measure the temperature of the cooling water at the inlet and outlet of the cooling water chamber of the small tuyere 1 at the initial stage of use and obtain the initial temperature difference between the inlet and outlet of the cooling water of the small tuyere 1, and measure the inlet and outlet cooling water of the small tuyere 1 in real time during use The outlet cooling water temperature and obtain the real-time temperature difference between the inlet and outlet cooling water of the small tuyere 1. If the value is set, replace the air outlet cover 1;

S504: Measure the temperature of the cooling water at the inlet and outlet of the cooling water cavity of the jacket 4 in the tuyere at the initial stage of use and obtain the initial temperature difference between the inlet and outlet cooling water of the jacket 4 in the tuyere, and measure the inlet and outlet cooling water chamber of the jacket 4 in the tuyere in real time during use The outlet cooling water temperature and the real-time temperature difference between the inlet and outlet cooling water of tuyere jacket 4 are obtained. Set the value, then change the cover 4 in the tuyere.

Based on the above-mentioned first, second, fourth and fifth embodiments, the water supply of the small tuyere 1 is reduced during use, and the small tuyere 1 with the rare earth tantalate ceramic thermal barrier coating in the embodiment of the present invention is The temperature difference between the inlet and outlet water during normal operation is adjusted to be basically the same as the water temperature difference between the inlet and outlet of the small tuyere 1 that does not have a rare earth tantalate ceramic thermal barrier coating;

The output heat of the small tuyere 1 is greatly reduced under the barrier, and the required cooling water is also greatly reduced. Because the small tuyere 1 is small in size, high-pressure water supply is used for a large amount of water supply. Taking a 3200m ³ blast furnace as an example, the water supply pressure is 1.6MPa, reducing The water supply volume of the small tuyere 1 is adjusted to the temperature difference between the inlet and outlet of the small tuyere 1 with the rare earth tantalate ceramic thermal barrier coating in the embodiment of the present invention when it is working normally, to the same value as that without the rare earth tantalate ceramic thermal barrier coating. When the water temperature difference between the inlet and outlet of the tuyere small sleeve 1 of the layer is basically the same, the water supply can drop by 1/2.

According to the reduced water supply, calculate the reduced energy of the water supply motor for water supply and cooling with pure water for circulation. Taking the 3200m ³ blast furnace as an example, the corresponding motor for the water supply of tuyere 1 is 750kVA. When the water supply is reduced by 1/2 , the water supply quality and flow rate are both reduced by 1/2, and the corresponding water supply power is reduced by more than 75%. The annual energy saving is estimated to be 750kVA×75%×24h×360d/10000=4.86 million Kw.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (21)

1. The utility model provides a wind gap cover, its characterized in that, the wind gap cover stretches into the outer peripheral face in the blast furnace and the export terminal surface sets up the first rare earth tantalate ceramic thermal barrier coating of thickness not less than 0.1mm, or, the wind gap cover stretches into the outer peripheral face in the blast furnace and the export terminal surface sets gradually the first rare earth tantalate ceramic thermal barrier coating of thickness not less than 0.1mm and the first super high temperature wear-resisting coating of thickness not less than 0.1 mm.

2. The tuyere small sleeve according to claim 1, wherein a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the wall surface of the air supply channel of the tuyere small sleeve, or a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a second ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the wall surface of the air supply channel of the tuyere small sleeve.

3. The tuyere small sleeve as claimed in claim 2, wherein a transition layer with a thickness of 0.1 mm-0.2 mm is arranged between the outer peripheral surface and the outlet end surface of the tuyere small sleeve and the first rare earth tantalate ceramic thermal barrier coating, and a transition layer with a thickness of 0.1 mm-0.2 mm is arranged between the wall surface of the air supply channel of the tuyere small sleeve and the second rare earth tantalate ceramic thermal barrier coating.

4. A tuyere small sleeve as claimed in claim 3, wherein a basic coating is arranged between the first rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating;

and/or a basic coating is arranged between the second rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

5. The tuyere small sleeve of claim 4, wherein the basic coating comprises a plurality of layers of yttria-stabilized zirconia coatings and a plurality of layers of third rare earth tantalate ceramic thermal barrier coatings, and each of the yttria-stabilized zirconia coatings and each of the third rare earth tantalate ceramic thermal barrier coatings are alternately arranged in sequence.

6. The tuyere small sleeve of any one of claims 2-5, wherein a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the first rare earth tantalate ceramic thermal barrier coating and the first ultra-high temperature wear-resistant coating;

and/or a transition layer with the thickness of 0.1-0.2 mm is arranged between the second rare earth tantalate ceramic thermal barrier coating and the second ultrahigh temperature wear-resistant coating.

7. Tuyere small sleeve according to any of the claims 1-5, characterized in that the first rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating; the second rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate

RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating.

8. The tuyere small sleeve of any of claims 1-5, wherein the first ultra-high temperature wear resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating; the second ultra-high temperature wear-resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating.

9. The utility model provides a cover in wind gap, its characterized in that, the export terminal surface of cover sets up the fourth rare earth tantalate ceramic thermal barrier coating that thickness is not less than 0.1mm in the wind gap, perhaps, the export terminal surface of cover sets up the fourth rare earth tantalate ceramic thermal barrier coating that thickness is not less than 0.1mm and the third superhigh temperature wear-resisting coating that thickness is not less than 0.1mm in proper order in the wind gap.

10. The tuyere medium sleeve of claim 7, wherein a transition layer with the thickness of 0.1 mm-0.2 mm is arranged between the outlet end face of the tuyere medium sleeve and the fourth rare earth tantalate ceramic thermal barrier coating.

11. The tuyere medium sleeve of claim 10, wherein a basic coating is arranged between the fourth rare earth tantalate ceramic thermal barrier coating and the transition layer, and the basic coating at least comprises a yttria-stabilized zirconia coating.

12. The tuyere medium sleeve of claim 11, wherein the base coating comprises a plurality of yttria-stabilized zirconia coatings and a plurality of fifth rare earth tantalate ceramic thermal barrier coatings, each of the yttria-stabilized zirconia coatings and each of the fifth rare earth tantalate ceramic thermal barrier coatings being alternately disposed in sequence.

13. The tuyere medium sleeve of any of claims 9-12, wherein a transition layer with a thickness of 0.1-0.2 mm is arranged between the fourth rare earth tantalate ceramic thermal barrier coating and the ultra-high temperature wear resistant coating.

14. Tuyere medium sleeve according to any of the claims 9-12, characterized in that the fourth rare earth tantalate ceramic thermal barrier coating is rare earth tantalate RETaO ₄ Single layer coating, rare earth tantalate RE ₃ TaO ₇ +RETaO ₄ Double-layer coating and rare earth tantalate RE ₃ TaO ₇ +RETa ₃ O ₉ +RETaO ₄ One of the three layers of coating.

15. The tuyere medium sleeve of any of claims 9-12, wherein the third ultra-high temperature wear resistant coating is one of a SiC coating, a SiN coating and a Ni-based WC coating.

16. A blast furnace tuyere device comprising a tuyere large sleeve, a tuyere medium sleeve and a tuyere small sleeve which are sequentially connected, wherein the tuyere small sleeve is the tuyere small sleeve according to any one of claims 1 to 8, and the tuyere medium sleeve is the tuyere medium sleeve according to any one of claims 9 to 15.

17. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and on the end face of an outlet, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and on the end face of the outlet;

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve at the initial stage and obtaining the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve in real time in the use process and obtaining the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, and replacing the tuyere small sleeve if the difference between the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve and the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve is larger than a preset value under the same working condition.

18. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the wall surface of an air supply channel of the tuyere small sleeve of the blast furnace tuyere device, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and a second ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm is sequentially arranged on the wall surface of the air supply channel of the tuyere small sleeve of the blast furnace tuyere device;

Measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve at the initial stage and obtaining the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve in real time in the use process and obtaining the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, and replacing the tuyere small sleeve if the difference between the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve and the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve is larger than a preset value under the same working condition.

19. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

the method comprises the steps that a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outlet end face of a tuyere medium sleeve of a blast furnace tuyere device, or a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a third ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outlet end face of the tuyere medium sleeve of the blast furnace tuyere device;

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere at the initial stage, and obtaining the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere in real time in the use process, and obtaining the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, wherein if the difference of the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere and the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere is larger than a preset value under the same working condition, the middle sleeve of the tuyere is replaced.

20. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and on the end face of an outlet, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a first ultrahigh-temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and on the end face of the outlet;

the method comprises the steps that a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outlet end face of a tuyere medium sleeve of a blast furnace tuyere device, or a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a third ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outlet end face of the tuyere medium sleeve of the blast furnace tuyere device;

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve at the initial stage and obtaining the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve in real time and obtaining the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve in the use process, and if the difference value between the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve and the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve is larger than a preset value under the same working condition, replacing the tuyere small sleeve;

Measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere at the initial stage, and obtaining the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere in real time in the use process, and obtaining the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, wherein if the difference of the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere and the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere is larger than a preset value under the same working condition, the middle sleeve of the tuyere is replaced.

21. An energy-saving method for a blast furnace tuyere device is characterized by comprising the following steps:

the method comprises the steps that a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outer peripheral surface of a tuyere small sleeve of a blast furnace tuyere device, which stretches into a blast furnace, and a second rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the wall surface of an air supply channel of the tuyere small sleeve of the blast furnace tuyere device, or a first rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and an ultra-high temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outer peripheral surface of the tuyere small sleeve of the blast furnace tuyere device, which stretches into the blast furnace, and an ultra-high temperature wear-resistant coating with the thickness not smaller than 0.1mm is sequentially arranged on the wall surface of the air supply channel of the tuyere small sleeve of the blast furnace tuyere device;

The method comprises the steps that a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm is arranged on the outlet end face of a tuyere medium sleeve of a blast furnace tuyere device, or a fourth rare earth tantalate ceramic thermal barrier coating with the thickness not smaller than 0.1mm and a third ultrahigh temperature wear-resistant coating with the thickness not smaller than 0.1mm are sequentially arranged on the outlet end face of the tuyere medium sleeve of the blast furnace tuyere device;

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve at the initial stage and obtaining the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the tuyere small sleeve in real time and obtaining the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve in the use process, and if the difference value between the real-time temperature difference of the inlet and outlet cooling water of the tuyere small sleeve and the initial temperature difference of the inlet and outlet cooling water of the tuyere small sleeve is larger than a preset value under the same working condition, replacing the tuyere small sleeve;

measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere at the initial stage, and obtaining the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, measuring the temperature of the inlet and outlet cooling water of the cooling water cavity of the middle sleeve of the tuyere in real time in the use process, and obtaining the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere, wherein if the difference of the real-time temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere and the initial temperature difference of the inlet and outlet cooling water of the middle sleeve of the tuyere is larger than a preset value under the same working condition, the middle sleeve of the tuyere is replaced.

Images