CN219546915U - Coal gasifier with on-line detection function - Google Patents

Abstract

The utility model relates to the technical field of coal gasification furnaces, in particular to a coal gasification furnace with on-line detection function, comprising: a gasification furnace shell; a burner is arranged on the top of the gasification furnace shell; Gasification chamber, waste heat recovery chamber and slag water chamber; the shell of the gasification furnace is provided with a first water-cooled wall, the first water-cooled wall is arranged around the gasification chamber, and the inlet side pipeline of the first water-cooled wall is provided with a first flow meter and The first temperature sensor, the first water-cooled wall includes several first water-cooled pipes connected in parallel, and at least 1/2 of the first water-cooled pipes are provided with a second temperature sensor at the inlet and outlet; the exhaust heat recovery chamber is provided with a synthesis gas outlet And the radiation waste pot, the radiation waste pot includes several groups of water cooling screens, the cooling water inlet of the water cooling screen is provided with a second flowmeter and the third temperature sensor, and the cooling water outlet of the water cooling screen is provided with a fourth temperature sensor. Through the structural arrangement of the utility model, the overall and local temperature conditions can be detected in real time.

Description

Coal gasifier with online detection function

technical field

The utility model relates to the technical field of coal gasification furnaces, in particular to a coal gasification furnace with an online detection function.

Background technique

Coal gasification technology, as an advanced technology for clean coal utilization, is the basis of modern coal chemical industry. After years of technology research and development and industrial application, coal gasification has basically formed three forms: fixed bed, fluidized bed, and entrained bed. Among them, entrained bed has become the mainstream of coal gasification technology due to its advantages of high gasification efficiency, strong adaptability to coal types, and environmental friendliness.

For the gasification process of coal water slurry, the typical structure of the existing gasifier is as follows:

A coal gasification device with a waste pot, which includes: a gasification furnace, a gas scrubber, a steam drum, a coarse slag treatment device and a gray water treatment device, wherein the gasification furnace includes a gasification chamber, a radiation waste pot and A chilling chamber. The gasification furnace has an inner shell and an outer shell sleeved outside the inner shell. The gasification chamber is arranged on the upper part of the inner shell. The radiant waste pot is connected to the chill chamber arranged at the lower part of the shell; the radiant waste pot is respectively connected to the steam drum through the boiler water inlet and the boiler water outlet.

In the process of gas production, it is very necessary to monitor the working condition of the water wall, but there is no good solution at present.

At the same time, the ash accumulation and slagging on the heating surface of the water wall of the coal gasifier seriously threaten the safe and economical operation of the blast furnace. Ash accumulation and slagging on the water-cooled wall will not only reduce the heat transfer capacity of the heating surface, but also lead to corrosion of the heating surface, weakening of the heat transfer capacity of the water-cooled wall, abnormal shutdown of the coal gasifier, and an increase in the maintenance cost of the coal gasifier. There are almost no online measurement schemes for the form of ash deposits and slagging.

Utility model content

The purpose of the utility model is to overcome one or more of the above-mentioned existing technical problems and provide a coal gasifier with an online detection function.

In order to achieve the above purpose, the utility model provides a coal gasifier with online detection function, including:

Gasifier shell;

The top of the gasifier shell is provided with a burner;

The shell of the gasification furnace is provided with a gasification chamber, a waste heat recovery chamber and a slag water chamber;

The shell of the gasification furnace is provided with a first water-cooled wall, the first water-cooled wall is arranged around the gasification chamber, and the inlet side pipeline of the first water-cooled wall is provided with a first flow meter and a first temperature sensor , the first water-cooled wall includes several first water-cooled tubes connected in parallel, and at least 1/2 of the first water-cooled tubes are provided with second temperature sensors at the inlet and outlet;

The top of the waste heat recovery chamber is connected to the top of the gasification chamber, and the waste heat recovery chamber is provided with a synthesis gas outlet and a radiation waste pot, and the radiation waste pot includes several groups of water cooling panels, and the cooling water inlet of the water cooling panels A second flowmeter and a third temperature sensor are provided, and the cooling water outlet of the water cooling panel is provided with a fourth temperature sensor;

The bottom of the gasifier shell shrinks to form a slag outlet, the top of the slag water chamber is connected to the bottom of the waste heat recovery chamber, the bottom of the slag water chamber is connected to the slag outlet, and the liquid in the slag water chamber A fifth temperature sensor is arranged under the bit line.

Preferably, the second temperature sensors arranged on each of the first water-cooled tubes in the first water-cooled wall are arranged at equal intervals, and the interval is not greater than 0.5m.

Preferably, the distance between the second temperature sensors provided on each of the first water-cooled tubes in the first water-cooled wall decreases gradually along the flow direction of the cooling water.

Preferably, the second temperature sensor is a thermocouple;

The thermocouple is connected to the thermocouple server in a wired manner.

Preferably, the thermocouple is arranged in a jacket, and the measuring end of the thermocouple extends to the outside of the jacket, and the jacket is in contact with the outer wall of the first water-cooled tube or goes deep into the inside of the first water-cooled tube .

Preferably, the length of the jacket protruding into the inner wall of the first water-cooled tube is 2-5mm.

Preferably, the synthesis gas outlet is arranged at the middle of the side wall of the waste heat recovery chamber, or at the top of the slag water chamber.

Preferably, the radiant waste pot further includes a second water cooling wall, a thermometer and a flow meter are installed at the inlet of the second water cooling wall, and a thermometer is installed at the outlet of the second water cooling wall.

Preferably, there are two groups of the second water cooling wall, and each group of the inlet side pipelines of the second water cooling wall is provided with a third flow meter and a sixth temperature sensor, and the second water cooling wall includes several parallel connected The second water-cooled pipe, and at least 1/2 of the second water-cooled pipe is provided with a seventh temperature sensor at the inlet and outlet.

Preferably, the number of water-cooling panels is 8-12, and they are evenly distributed around the waste heat recovery chamber.

Based on this, the beneficial effects of the utility model are:

1. Through the solution of the utility model, by setting multiple temperature sensors on the water-cooled wall, the heat absorption and heat distribution of the water-cooled wall can be detected online, and the targeted sampling points of the water-cooled wall can be obtained, thereby indirectly obtaining the temperature distribution of the inner wall of the furnace ;

2. Through the scheme of the utility model, multiple temperature sensors are arranged, and are arranged at intervals on each cooling pipe of the water-cooled wall, which improves fault tolerance and reduces installation and maintenance costs. Even if some temperature sensors are offline, it will not affect Overall inspection;

3. Through the solution of the utility model, the temperature detected by the temperature sensor is indirectly related to the temperature distribution of the gasifier, so that the fouling condition in the pipeline in the water-cooled wall can be judged.

Description of drawings

Fig. 1 schematically shows the structural representation of a coal gasifier with on-line detection function according to an embodiment of the present invention;

2 and 3 schematically represent a schematic diagram of the arrangement of the second temperature sensor in an embodiment of the present invention;

Fig. 4 schematically shows a structural schematic view of multiple groups of water-cooled walls in an embodiment of the present invention;

Fig. 5 schematically shows a schematic diagram of a jacket extending into a water-cooled pipe according to an embodiment of the present invention.

Detailed ways

The content of the present utility model will now be discussed with reference to exemplary embodiments. It should be understood that the discussed embodiments are only intended to enable those of ordinary skill in the art to better understand and thus realize the content of the present utility model, rather than to imply any limitation to the present utility model. No restrictions on the scope of the new type.

As used herein, the term "comprising" and variations thereof are to be read as open-ended terms meaning "including but not limited to". The term "based on" is to be read as "based at least in part" and the terms "one embodiment" and "an embodiment" are to be read as "at least one embodiment".

Fig. 1 schematically shows a coal gasifier with on-line detection function of an embodiment of the utility model, and further, Fig. 2, 3 schematically shows the schematic diagram of the arrangement mode of the temperature sensor of the utility model, as Fig. 1, 2, 3 As shown, the coal gasifier with on-line detection function of the utility model includes:

Gasifier shell 10;

A burner 20 is provided on the top of the gasifier shell 10;

The gasifier shell 10 is provided with a gasification chamber 30 , a waste heat recovery chamber 40 and a slag water chamber 50 ;

A first water-cooled wall 301 is arranged inside the gasification furnace shell 10, and the first water-cooled wall 301 is arranged around the gasification chamber 30. The inlet side pipeline of the first water-cooled wall 301 is provided with a first flowmeter 302 and a first temperature sensor 303 , the first water-cooled wall 301 includes several first water-cooled pipes 3011 connected in parallel, and at least half of the inlet and outlet of the first water-cooled pipes 3011 are provided with a second temperature sensor 3012;

The top of the waste heat recovery chamber 40 is connected to the top of the gasification chamber 30. The waste heat recovery chamber 40 is provided with a synthesizer outlet 401 and a radiation waste pot 402. The radiation waste pot 402 includes several groups of water cooling panels 4021. The cooling water inlets of the water cooling panels 4021 are provided with The second flowmeter 4022 and the third temperature sensor 4023, the cooling water outlet of the water cooling screen 4021 is provided with a fourth temperature sensor 4024;

The bottom of the gasifier shell 10 shrinks to form a slag outlet 101, the top of the slag water chamber 50 is connected to the bottom of the waste heat recovery chamber 40, the bottom of the slag water chamber 50 is connected to the slag outlet 101, and the liquid level of the slag water chamber 50 is A fifth temperature sensor 501 is arranged offline.

Specifically, the coal gasifier of the present utility model is in the form of a Jinhua furnace, and as a whole includes a gasifier shell 10, a burner 20, a gasification chamber 30, a waste heat recovery chamber 40, and a slag water chamber 50. When the coal-water slurry After feeding, it is ejected from the burner 20 located at the top of the gasification furnace shell 10, and gasified in the gasification chamber 30. The coal-water slurry forms slag and synthesis gas, which is absorbed by the first water-cooled wall in the gasification chamber 30. 301 for heat exchange, and then enters the waste heat recovery chamber 40 at the bottom of the gasification chamber 30, where it is once again exchanged for heat by the radiant waste pot 402 in it, and the generated syngas is discharged through the syngas outlet 401, and the waste residue enters the slag water chamber 50, and is cooled The process recovers energy and discharges it from the slag outlet 101.

And the first water-cooled wall 301 is arranged around the gasification chamber 30, and the water flows through the first water-cooled wall 301 to perform heat exchange operation on the substances in the gasification chamber 30, and a first flowmeter is installed on the inlet side pipeline of the first water-cooled wall 302 and the first temperature sensor 303, capable of detecting the flow rate and temperature of the water flow;

The first water-cooled wall 301 includes several first water-cooled pipes 3011 connected in parallel, and a plurality of second temperature sensors 3012 are arranged on the first water-cooled pipes 3011, and the temperature of the first water-cooled pipes 3011 at each position is detected by the second temperature sensors 3012 , and then detect the temperature of the water flow in it, so as to obtain the temperature distribution of the gasifier indirectly.

At the same time, by obtaining the flow direction information of the first flow meter 302 on the inlet side pipeline of the first water-cooled wall 301, combined with the temperatures of the first temperature sensor 303 and the second temperature sensor 3011, a reference value of total heat can be obtained, which can be used to indicate gas Whether the furnace is working normally.

By arranging the fifth temperature sensor 501 under the liquid level line of the slag water chamber 50, the temperature of the liquid in the slag water chamber 50 after the gasified solid product is cooled can be obtained. When the cooling water inlet temperature is constant, the temperature The change can provide a reference value of the actual heat transfer.

Further, taking the second temperature sensor 3012 as an example, the second temperature sensor 3012 of the present invention has multiple implementation modes, as shown in FIG. 2 , in the first implementation mode:

The second temperature sensors 3012 on each of the first water-cooled tubes 3011 in the first water-cooled wall 301 are arranged at equal intervals, and the intervals are not greater than 0.5m.

In this way, since the cooling water in the first water-cooled tube 3011 is constantly exchanging heat, the temperature continues to rise, and a plurality of second temperature sensors 3012 are arranged at equal intervals on each of the first water-cooled tubes 3011, which can fully monitor the temperature of the first water-cooled tube 3011. The heat exchange of cooling water at different positions in a water-cooled pipe 3011 is detected, and the formation of scaling on the first water-cooled pipe 3011 can also be fully detected.

Further, as shown in Figure 3, in the second implementation manner:

The distance between the second temperature sensors 3012 provided on each first water-cooled tube 3011 in the first water-cooled wall 301 decreases gradually along the flow direction of the cooling water.

In this way, since the temperature of the cooling water in the first water-cooled pipe 3011 is constantly increasing, the spacing of the second temperature sensors 3012 can be set to gradually decrease along the flow direction, so that the second temperature sensors 3012 are gradually densely arranged. It better matches the temperature rise frequency of the cooling water in the first water-cooled pipe 3011, and can accurately detect the temperature in the gasifier. At the same time, when a very few second temperature sensors 3012 fail, it will not affect the overall detection, improving fault tolerance.

Further, in the application scene of the utility model, the coal-water slurry is pumped into the main inlet on the top of the furnace body by the high-pressure coal slurry pump and enters the furnace cavity, and a part of the external oxygen, such as 80%-100%, passes through the main process burner Enter the furnace cavity, and another part enters the furnace cavity through the secondary oxygen nozzle. Coal slurry, oxygen and water undergo complicated redox reactions in the gasification chamber 30 at a high temperature of 1,500 degrees Celsius and a pressure of normal pressure to 1.6 MPa to produce crude synthetic gas with CO, H ₂ and CO ₂ as main components. Gas, coal slurry is melted at high temperature to produce ash.

The high-temperature crude syngas in the gasification chamber 30 and the ash waste heat recovery chamber 40, at the same time, the heat carried by the ash and crude syngas passes through the radiant waste pot 402 to generate steam, and finally enters the cold water in the slag water chamber Black water and slag are obtained, and the synthesis gas is exported after entering the bottom.

For the first water cooling wall 301 , it is necessary to ensure that the area surrounding the gasification chamber 30 by the first water cooling wall 301 is not less than 30% of the entire area of the gasification chamber 30 .

Further, the first water-cooled wall 301 may be a membrane-type water-cooled wall. The membrane-type water-cooled wall refers to a water-cooled wall composed of airtight tube panels welded by flat steel and pipes, which can ensure that the furnace has good tightness , For negative pressure boilers, it can significantly reduce the air leakage coefficient of the furnace and improve the combustion conditions in the furnace. It can increase the effective radiation heating area, thereby saving steel consumption.

Further, in order to increase the heat exchange capacity of the first water-cooled wall 301, the first water-cooled wall 301 may include a main membrane water-cooled wall formed by a row of tubes and fins arranged between the tubes. One or more rows of tubes are added on the side of the heating surface, and the tubes of one or more rows of tubes are arranged correspondingly to the tubes of the main membrane water wall, and the corresponding tubes are connected by fins. This setting method is the form adopted in the early configuration of the gasifier for the difficult-to-gasify high-melting high-ash coal. This kind of high-strength membrane water-cooled wall is to add one or more rows of tubes on the heating surface side of the main membrane-type water-cooled wall. The main membrane-type water-cooled wall is composed of tubes and fins arranged between the tubes. An additional The tubes of one or more rows of tubes are arranged correspondingly to the tubes of the main membrane water wall, and the corresponding tubes are connected with fins to form an integral body with the membrane water wall. The connection between the tubes and the fins can be welded.

Fig. 4 schematically shows a schematic structural view of multiple sets of water-cooled walls in an embodiment of the present invention. As shown in Fig. 4, taking the first water-cooled wall 301 as an example, in the setting method of removing the above-mentioned first water-cooled wall 301, also Multi-stage partition cooling can be adopted, for example, two partitions are set for the gasification chamber 30, and each partition contains an independent water-cooled wall. Then, an array of multiple temperature sensors can be set at this time, and an inlet water temperature sensor and an outlet water temperature sensor are arranged for each array of temperature sensors, wherein the water inlet temperature sensor is arranged on the inlet pipeline and outlet pipeline of the cooling water of the water wall.

The corresponding setting interval can be determined according to the coal that needs to be gasified. If the coal quality is better (lower ash content, lower melting point), then a larger interval can be set; otherwise, a higher gasification temperature needs to be provided, and more For dense temperature sensor setup.

Further, the second temperature sensor 3012 is a thermocouple;

Thermocouples connect to the Thermocouple Server in limited ways.

The thermocouple is arranged in the jacket 30121 , and the measurement end of the thermocouple extends to the outside of the jacket 30121 , and the jacket 30121 and the outer wall of the first water-cooled tube 3011 contact or go deep into the inside of the first water-cooled tube 3011 .

The length of the jacket 30121 protruding into the inner wall of the first water cooling tube 3011 is 2-5mm.

In this way, the end of the thermocouple can be provided with a data line connected to the data acquisition and processing system, so that the temperature data detected by the thermocouple can be collected and stored, and the thermocouple can be placed in the jacket 30121 to protect it and prevent the thermocouple from Deformation occurs, through this setting method, the requirements of low measurement cost, high prediction accuracy, and easy installation and maintenance can be met.

Figure 5 schematically shows a schematic diagram of the jacket extending into the water-cooled pipe according to an embodiment of the present invention. Connection method, in the first method, as shown in the upper part of Figure 5, the jacket 30121 is in contact with the outer wall of the first water-cooled tube 3011 to achieve temperature measurement. Although this method can achieve temperature measurement, due to the thermocouple If the measuring end of the cooling water is not in direct contact with the cooling water, the accuracy of the measurement may not be guaranteed.

In the second embodiment, as shown in the lower part of Figure 5, the jacket 30121 extends into the first water-cooled tube 3011, and the measuring end of the thermocouple can directly contact the cooling water to achieve more accurate measurement, and the jacket The extension length of 30121 is limited so that the extension length ranges from 2-5mm.

In the actual experimental data, when the extension length of the jacket 30121 is 15mm, it can achieve temperature measurement with better accuracy, but this method will lead to the deposition of scale, cause blockage, and affect the flow of cooling water. When it is 2-5mm, it can effectively reduce the degree of scale deposition, and it can also have good reliability of working condition detection.

Further, the syngas outlet 401 is arranged at the middle of the side wall of the waste heat recovery chamber 40 , or at the top of the slag water chamber 50 .

As for the setting position of the synthesis gas outlet 401, it can be set in the middle of the side wall of the waste heat recovery chamber 40, the top of the slag water chamber 50, or on the upper part of the waste heat recovery chamber 40. When the setting position of the synthesis gas outlet 401 is different, The temperature of the outlet gas will also change. Therefore, the temperature of the obtained syngas can be used to indicate whether the same gasifier is working normally.

Further, as shown in Figure 4, the radiation waste pot 402 also includes a second water-cooled wall 4025, the inlet of the second water-cooled wall 4025 is provided with a sixth temperature sensor 4026 and a third flow meter 4027, and the outlet of the second water-cooled wall 4025 is provided with There is a seventh temperature sensor 4028 .

The second water cooling wall 4025 is divided into two groups, and the inlet side pipeline of each group of second water cooling wall 4025 is provided with the third flow meter 4027 and the sixth temperature sensor 4026 , and the outlet side pipeline is provided with the seventh temperature sensor 4027 .

The second water-cooled wall 4025 includes several second water-cooled pipes connected in parallel, and at least 1/2 of the second water-cooled pipes are provided with an eighth temperature sensor at the inlet and outlet.

The number of groups of water cooling screens 4021 is 8-12, and they are evenly distributed around the waste heat recovery chamber 40 .

Specifically, the radiant waste pot 402 can be a water-cooled screen 4021, with 8-12 groups, or a second water-cooled wall 4025, with one or two groups, both of which can realize the heat exchange effect of the syngas, while the second flow meter 4022, the setting of the third temperature sensor 4023, the fourth temperature sensor 4024, the third flow meter 4027, the sixth temperature sensor 4026, and the seventh temperature sensor 4027 can detect the flow of cooling water and the temperature at the inlet and outlet, To obtain the overall heat transfer information.

At the same time, the eighth temperature sensor provided on the second water-cooled tube can obtain the specific temperature distribution of different positions in the tube.

The second water cooling wall 2025 has the same structure as the first water cooling wall 301;

The structure of the eighth temperature sensor is the same as that of the second temperature sensor 3012, and they can be arranged at equal or unequal intervals.

To sum up, the utility model provides a coal gasification furnace with an online detection function. Temperature sensors and flowmeters are installed at the inlet and outlet of the water-cooled wall or water-cooled screen in the gasification chamber 30 and the waste heat recovery chamber 40, which can obtain water cooling. The actual heat transfer effect of the wall or water-cooled panel, by setting multiple temperature sensors on each water-cooled tube in the water-cooled wall or water-cooled panel, the heat exchange capacity of different regions and positions can be obtained, and the temperature distribution of the inner wall of the furnace can be obtained indirectly , to achieve a better monitoring effect on the gasifier, and at the same time, according to the temperature detection, it can also judge the fouling in the water-cooled tube, effectively ensuring the normal operation of the gasifier.

Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the devices and equipment described above can refer to the corresponding process in the foregoing method embodiments, and details are not repeated here.

The above description is only a description of the preferred embodiments of the present invention and the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this utility model is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but should also cover the technical solutions made by the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of features or equivalent features. For example, a technical solution formed by replacing the above-mentioned features with the technical features disclosed in the present invention (but not limited to) having similar functions.

Claims (11)

1. A coal gasifier with an online detection function, characterized in that it comprises: Gasifier shell; The top of the gasifier shell is provided with a burner; The shell of the gasification furnace is provided with a gasification chamber, a waste heat recovery chamber and a slag water chamber; The shell of the gasification furnace is provided with a first water-cooled wall, the first water-cooled wall is arranged around the gasification chamber, and the inlet side pipeline of the first water-cooled wall is provided with a first flow meter and a first temperature sensor , the first water-cooled wall includes several first water-cooled tubes connected in parallel, and at least 1/2 of the first water-cooled tubes are provided with second temperature sensors at the inlet and outlet; The top of the waste heat recovery chamber is connected to the top of the gasification chamber, and the waste heat recovery chamber is provided with a synthesis gas outlet and a radiation waste pot, and the radiation waste pot includes several groups of water cooling panels, and the cooling water inlet of the water cooling panels A second flowmeter and a third temperature sensor are provided, and the cooling water outlet of the water cooling panel is provided with a fourth temperature sensor; The bottom of the gasifier shell shrinks to form a slag outlet, the top of the slag water chamber is connected to the bottom of the waste heat recovery chamber, the bottom of the slag water chamber is connected to the slag outlet, and the liquid in the slag water chamber A fifth temperature sensor is arranged under the bit line. 2. The coal gasifier with online detection function according to claim 1, characterized in that, the second temperature sensors arranged on each of the first water-cooled tubes in the first water-cooled wall are arranged at equal intervals , and the spacing is not greater than 0.5m. 3. The coal gasifier with online detection function according to claim 1, characterized in that the distance between the second temperature sensors set on each of the first water-cooled tubes in the first water-cooled wall is Decrease gradually along the flow direction of cooling water. 4. The coal gasifier with online detection function according to claim 1, wherein the second temperature sensor is a thermocouple; The thermocouple is connected to the thermocouple server in a wired manner. 5. The coal gasifier with online detection function according to claim 4, wherein the thermocouple is arranged in the jacket, and the measuring end of the thermocouple extends to the outside of the jacket, and the jacket Contact with the outer wall of the first water-cooled tube or go deep into the inside of the first water-cooled tube. 6 . The coal gasifier with online detection function according to claim 5 , wherein the length of the jacket extending into the inner wall of the first water-cooled tube is 2-5 mm. 7. The coal gasifier with on-line detection function according to claim 1, characterized in that, the synthesis gas outlet is arranged in the middle of the side wall of the waste heat recovery chamber, or on the top of the slag water chamber. 8. The coal gasifier with online detection function according to claim 1, characterized in that, the radiant waste pot also includes a second water-cooled wall, and the entrance of the second water-cooled wall is provided with a sixth temperature sensor and a second water-cooled wall. Three flow meters, the outlet of the second water wall is provided with a seventh temperature sensor. 9. The coal gasifier with online detection function according to claim 8, characterized in that, the second water-cooled wall is divided into two groups, and each group of the second water-cooled wall inlet side pipeline is provided with the first Three flowmeters and the sixth temperature sensor, the outlet side pipeline is provided with the seventh temperature sensor. 10. The coal gasifier with online detection function according to claim 9, characterized in that, the second water-cooled wall includes several second water-cooled pipes connected in parallel, and at least 1/2 of the second water-cooled pipes The eighth temperature sensor is arranged at the inlet and outlet of the inlet. 11. The coal gasifier with online detection function according to claim 1, characterized in that, the number of said water-cooled panels is 8-12, and they are evenly distributed around said waste heat recovery chamber.