CN120274276B - Flameless combustion furnace and control method - Google Patents
Flameless combustion furnace and control methodInfo
- Publication number
- CN120274276B CN120274276B CN202510772333.4A CN202510772333A CN120274276B CN 120274276 B CN120274276 B CN 120274276B CN 202510772333 A CN202510772333 A CN 202510772333A CN 120274276 B CN120274276 B CN 120274276B
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- temperature measuring
- combustion chamber
- ignition
- furnace body
- smoldering
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Incineration Of Waste (AREA)
Abstract
The invention discloses a flameless combustion furnace and a control method, and relates to the technical field of solid waste treatment, wherein the flameless combustion furnace comprises a furnace body, an oxygen supply unit, a plurality of ignition units and a detection unit; the device comprises a furnace body, an oxygen supply unit, an ignition unit, a detection unit and a detection unit, wherein a cavity is formed in the middle of the furnace body, an annular combustion chamber is formed between the outer surface of the cavity and the outer surface of the furnace body, a feeding port is formed in the upper end of the furnace body, a discharging port is formed in the lower end of the furnace body, the oxygen supply unit comprises a total flow pipe, one end of the total flow pipe is located on the central axis of the cavity, the other end of the total flow pipe is located outside the furnace body, one end of the ignition unit is connected with one end of the total flow pipe, the other end of the ignition unit is connected with the combustion chamber, a plurality of ignition units are located at the same height, and a plurality of ignition units are evenly distributed along the circumferential direction of the furnace body. The invention has the advantages of high smoldering efficiency and complete smoldering.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment, and particularly relates to a flameless combustion furnace and a control method.
Background
The smoldering organic solid waste treatment technology is an emerging solid waste treatment scheme and mainly aims at low-heat-value organic solid waste. The technology skillfully utilizes biomass fuel and porous heat storage medium materials to realize low-temperature flameless combustion and can enable the combustion process to be self-sustaining and spread. The method not only combines the advantages of quick reaction and complete harmlessness after ashing of the traditional incineration technology, but also has unique technical advantages that the method can directly treat the high-water-content organic solid waste without pre-drying. From the principle aspect, the technology greatly reduces the energy consumption of the traditional solid waste treatment technology, effectively reduces the investment and the operation cost, and shows extremely broad development prospect.
The furnace type currently used is cylindrical. In actual operation, the solid waste, the fuel and the heat storage material are mixed according to a specific proportion and then added into the furnace. And the material is directly heated by a heating device at the ignition position in the furnace until the ignition temperature is reached, and then air is supplied to ignite the material. However, due to the nature of the mixture itself, the layer of material exhibits a wavy shape and is unevenly distributed during the charging process. Furthermore, the heating rod needs to be inserted inside the material, which requires the provision of a protective device, which results in a somewhat inefficient heat transfer. Various factors are mutually interwoven, and finally, the phenomenon that partial waste cannot be completely combusted is caused. To solve such problems, a flameless combustion furnace and a control method are proposed.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art.
Therefore, the invention provides the flameless combustion furnace and the control method, and the flameless combustion furnace and the control method have the advantages of high smoldering efficiency and complete smoldering.
The flameless combustion furnace and the control method thereof comprise a furnace body, an oxygen supply unit, a plurality of ignition units and a detection unit, wherein a cavity is formed in the middle of the furnace body, the furnace body and the cavity are both cylindrical, the cavity and the furnace body are coaxially arranged in the height direction, an annular combustion chamber is formed between the outer surface of the cavity and the outer surface of the furnace body, a feeding port is formed at the upper end of the furnace body, a discharging port is formed at the lower end of the furnace body, the oxygen supply unit comprises a total flow pipe, one end of the total flow pipe is positioned on the central axis of the cavity, the other end of the total flow pipe is positioned outside the furnace body, one end of the ignition unit is connected with one end of the total flow pipe, the other end of the ignition unit is connected with the combustion chamber, the ignition units are positioned at the same height, the ignition units are uniformly distributed in the circumferential direction of the furnace body, and the detection unit is arranged on the inner wall of the combustion chamber and is used for detecting the smoldering state in the combustion chamber.
According to one embodiment of the invention, the ignition unit comprises a first branch pipe, a heater and a first temperature measuring point, wherein the first branch pipe is connected with a first control valve, two ends of the first branch pipe are respectively communicated with a total flow pipe and a combustion chamber so as to be used for transmitting oxygen in the total flow pipe to the combustion chamber, the heater and the first temperature measuring point are both arranged on the first branch pipe, the first temperature measuring point is positioned between the heater and the combustion chamber, the heater is used for heating gas in the first branch pipe, and the first temperature measuring point is used for detecting the temperature of the gas in the first branch pipe.
According to one embodiment of the invention, the oxygen supply unit further comprises a plurality of second branch pipes, the second branch pipes are connected with second control valves, two ends of each second branch pipe are respectively connected with the main flow pipe and the combustion chamber, the plurality of second branch pipes are uniformly arranged at intervals around the circumferential direction of the combustion chamber, the plurality of second branch pipes are positioned at the same height, and the second branch pipes are positioned below the ignition unit.
According to one embodiment of the invention, the detection unit comprises a first temperature measurement group, a second temperature measurement group, a third temperature measurement group and a fourth temperature measurement group, wherein the first temperature measurement group, the second temperature measurement group, the third temperature measurement group and the fourth temperature measurement group are arranged at intervals from bottom to top along the central axis direction of the combustion chamber, each of the first temperature measurement group, the second temperature measurement group, the third temperature measurement group and the fourth temperature measurement group comprises a plurality of second temperature measurement points, and a plurality of second temperature measurement points are arranged at intervals along the circumferential direction of the combustion chamber.
According to one embodiment of the present invention, the number of the second temperature measuring points of the first temperature measuring group, the second temperature measuring group, the third temperature measuring group and the fourth temperature measuring group is the same as the number of the ignition units, and corresponds to one another.
According to one embodiment of the invention, the top of the cavity is provided with a cone structure, and the feed inlet is positioned above the vertex of the cone structure.
A control method of a flameless combustion furnace, adopting any one of the above flameless combustion furnace, comprising the steps of:
s1, adding fuel into a combustion chamber to enable the fuel to cover and be higher than an ignition unit;
S2, adding a mixture mixed with a heat storage material, fuel and solid waste above the fuel in a staged manner;
S3, feeding high-temperature hot air into the combustion chamber by adopting an ignition unit so as to smoldering fuel and drying the mixture above the fuel;
s4, continuously supplying oxygen to the combustion chamber by the oxygen supply unit;
s5, detecting a smoldering state in the combustion chamber by the detection unit, and driving the corresponding ignition unit to start or increase the oxygen supply amount of the oxygen supply unit according to the detection result;
S6, discharging part of the material ash from the discharge hole according to the detection result of the detection unit.
According to one embodiment of the present invention, in S5, if the detecting unit detects that a part of the area is not smoldered, the ignition unit is controlled to ignite the area, and if it detects that the smoldering of a certain vertical area is slower, the oxygen supply amount of the area is increased.
The invention has the beneficial effects that the combustion chamber is in an annular structure, the plurality of ignition units are arranged in the combustion chamber, so that the cross section of the combustion chamber is dispersed into a plurality of small areas, the ignition uniformity is realized by respectively controlling the plurality of ignition units, the phenomenon of incomplete smoldering is avoided, and the ignition efficiency is improved;
The smoldering condition in the combustion chamber is detected by adopting the detection unit, and the ignition units at the corresponding positions are respectively controlled to perform secondary ignition operation according to the detection result, so that the situation that the discharged ash is not smoldered is avoided under the partial smoldering incomplete state and the completeness of smoldering is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic side sectional view of the overall structure of the present invention;
FIG. 2 is a schematic top view cross-sectional structure of the present invention;
Reference numerals:
1. A furnace body; 11, a feed inlet, 12, a discharge outlet, 2, a total flow pipe, 3, a first branch pipe, 31, a first temperature measuring point, 4, a second branch pipe, 5, a combustion chamber, 61, a first temperature measuring group, 62, a second temperature measuring group, 63, a third temperature measuring group, 64 and a fourth temperature measuring group.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
A flameless combustion furnace and a control method according to an embodiment of the present invention are specifically described below with reference to the accompanying drawings.
As shown in figures 1-2, the flameless combustion furnace and the control method according to the embodiment of the invention comprise a furnace body 1, an oxygen supply unit, a plurality of ignition units and a detection unit, wherein a cavity is formed in the middle of the furnace body 1, the furnace body 1 and the cavity are both cylindrical, the cavity and the furnace body 1 are coaxially arranged in the height direction, a combustion chamber 5 is formed between the outer surface of the cavity and the outer surface of the furnace body 1, a feed inlet 11 is formed at the upper end of the furnace body 1, a discharge outlet 12 is formed at the lower end of the furnace body 1, the oxygen supply unit comprises a total flow pipe 2, one end of the total flow pipe 2 is positioned in the cavity, the other end of the total flow pipe 2 is positioned outside the furnace body 1, one end of the ignition unit is connected with one end of the total flow pipe 2, the other end of the ignition unit is connected with the combustion chamber 5, the ignition units are positioned at the same height, the ignition units are uniformly arranged at intervals, the detection unit is arranged on the inner wall of the combustion chamber 5, and the detection unit is used for detecting the smoldering state in the combustion chamber 5.
In the embodiment, the combustion chamber 5 is of an annular structure, the plurality of ignition units are arranged in the combustion chamber 5, the cross section of the combustion chamber 5 is dispersed into a plurality of small areas, the ignition units are used for controlling, the ignition uniformity is realized, the phenomenon of incomplete smoldering combustion is avoided, and meanwhile, the ignition efficiency is improved. The smoldering condition in the combustion chamber 5 is detected by adopting the detection unit, and the ignition units at the corresponding positions are respectively controlled to perform secondary ignition operation according to the detection result, so that the situation that the discharged ash is not smoldered is avoided under the partial smoldering incomplete state and the completeness of smoldering is ensured.
The furnace body 1 and the cavity are both cylinders.
One end of the total flow pipe 2 is positioned on the central axis of the cavity, and a plurality of ignition units are uniformly distributed along the circumferential direction of the furnace body 1.
In this embodiment, the areas of the areas corresponding to the ignition units are the same, so that the time difference of complete smoldering of each area is reduced, and the overall working efficiency is improved.
The ignition unit comprises a first branch pipe 3, a heater and a first temperature measuring point 31, wherein the first branch pipe 3 is connected with a first control valve, two ends of the first branch pipe 3 are respectively communicated with the total flow pipe 2 and the combustion chamber 5 so as to be used for transmitting oxygen in the total flow pipe 2 to the combustion chamber 5, the heater and the first temperature measuring point 31 are both arranged on the first branch pipe 3, the first temperature measuring point 31 is positioned between the heater and the combustion chamber 5, the heater is used for heating gas in the first branch pipe 3, and the first temperature measuring point 31 is used for detecting the temperature of the gas in the first branch pipe 3.
In this embodiment, when ignition is required, the first control valve and the heater are turned on, so that the gas of the main flow pipe 2 is led to the combustion chamber 5, and is heated to realize the ignition function, and after the ignition is finished, the heater can be controlled to be turned off, oxygen supply is continuously performed in the combustion chamber 5, the heater is an electromagnetic heater, the first branch pipe 3 is heated by adopting an electromagnetic principle, the structure is simple, hot air can be directly acted on materials, the heating speed is high, the heating efficiency is improved, and the conditions of rapid ignition and subsequent rapid adjustment of partial burning are realized.
The oxygen supply unit still includes a plurality of second branch pipes 4, and second branch pipe 4 is connected with the second control valve, and total flow pipe 2 and combustion chamber 5 are connected respectively at the both ends of second branch pipe 4, and a plurality of second branch pipes 4 set up around the circumferencial direction uniform spacing of combustion chamber 5, and a plurality of second branch pipes 4 are located same height, and second branch pipe 4 is located the below of ignition unit, and the intake of second branch pipe 4 can be controlled to the second control valve.
In this embodiment, the second branch pipe 4 is used for supplying oxygen to the combustion chamber 5, and in the process of supplying oxygen, the ash material lower than the first branch pipe 3 is cooled, so that the discharged ash material is in a low-temperature state, and meanwhile, the heat carried by the ash material is blown upwards, the heat is utilized to smolder the material above the first branch pipe 3 and the material at the upper end of the combustion chamber 5, the requirement on the dryness of the material is reduced, and the step of pre-drying treatment is saved.
The detection unit comprises a first temperature measuring group 61, a second temperature measuring group 62, a third temperature measuring group 63 and a fourth temperature measuring group 64, wherein the first temperature measuring group 61, the second temperature measuring group 62, the third temperature measuring group 63 and the fourth temperature measuring group 64 are arranged at intervals from bottom to top along the central axis direction of the combustion chamber 5, and each of the first temperature measuring group 61, the second temperature measuring group 62, the third temperature measuring group 63 and the fourth temperature measuring group 64 comprises a plurality of second temperature measuring points which are arranged at intervals along the circumferential direction of the combustion chamber 5.
In the embodiment, the first branch pipes 3, the second branch pipes 4 and the second temperature measuring points correspond to each other in the vertical direction, and the number of the first branch pipes 3 is,The number of the first branch pipes 3 can be properly adjusted; Outer radius of combustion chamber 5 Unitless numerical value of units.
The second branch 4 is arranged about 0.2 from the combustion chamber 5The first branch pipe 3 is arranged at a distance of about 0.6 from the combustion chamber 5 to provide oxygen supply for normal smoldering combustion and cool ash materials for a normal air inletIs used for providing high-temperature hot air ignition during furnace starting and supplementing heat during poor working conditions.
From the radius and throughput of the combustion chamber 5, the required material height can be calculated as:
In the middle of Smoldering material height,Daily throughput of mixture,Radius of outer ring of smoldering furnace,Radius of inner ring of smoldering furnace,Density of the mixture。
Smoldering disposal rate;
In the middle ofSmoldering disposal rate,Daily throughput of mixture,Radius of outer ring of smoldering furnace,Radius of inner ring of smoldering furnace,Density of the mixture,Actual smoldering time of material,Is thatIs not a unit number.
The combustion chamber 5 is divided into a cooling section, a smoldering section and a drying section from bottom to top, the first branch pipe 3 is positioned at the lowest part of the smoldering section, wherein the first temperature measuring group 61 is positioned at 5-8 above the bottom of the cooling sectionPreferably, the second temperature measuring group 62 and the third temperature measuring group 63 are both positioned in the smoldering section, and the second temperature measuring group 62 is positioned above the first branch pipe 3 and 2The left and right positions are proper, the third temperature measuring group 63 is positioned above the second temperature measuring group 62 by 2The left and right positions are proper, i.e. the height of the smoldering section is controlled to be 2Left and right, for detecting smoldering area in smoldering section, evaluating smoldering layer position of material, timely finding out partial burning phenomenon, fourth temperature measuring group 64 is positioned in drying section, and is 5-8 above smoldering sectionAnd (3) detecting the pyrolysis effect and the dryness of the materials in the drying section at the position.
The number of second temperature measuring points of the first temperature measuring group 61, the second temperature measuring group 62, the third temperature measuring group 63 and the fourth temperature measuring group 64 is the same as the number of ignition units, and corresponds to one another.
In this embodiment, the specific offset firing positions are detected in a one-to-one correspondence manner, so that corresponding improvement measures can be quickly made.
The cavity is understood to be a tube which is the inner wall of the combustion chamber 5, the top of which cavity is formed with a cone structure which seals the upper end of the tube, and the feed inlet 11 is located above the apex of the cone structure.
In this embodiment, the material is convenient for disperse, makes the annular combustion chamber 5 in the cloth more even, and simple structure, area occupied is little, has reduced the volume of this flameless combustion furnace.
The control method of the flameless combustion furnace adopts the flameless combustion furnace and comprises the following steps:
S1, adding fuel into a combustion chamber 5 to enable the fuel to cover and be higher than an ignition unit, firstly adding a heat storage material to enable the height of the heat storage material to be flush with the lower surface of a first branch pipe 3, so that non-smoldering materials in the area below the first branch pipe 3 are avoided, the smoldering completeness is improved, then filling part of the fuel, and enabling the fuel to have a certain height to improve the ignition speed during initial ignition and dry the mixture above the former.
S2, adding a mixture mixed with a heat storage material, fuel and solid waste above the fuel in a staged manner, wherein the heat storage material can be sand and the fuel can be biomass.
S3, feeding high-temperature hot air into the combustion chamber 5 by adopting an ignition unit to smolder fuel, drying the mixture above the fuel, and closing the ignition unit after the ignition is finished, wherein in the process, the second branch pipe 4 is in a closed state. Specifically, the heater is turned on to control the temperature of the first branch pipe 3 to be about 200 ℃, when the temperature in the corresponding area of the second temperature measuring group 62 and the third temperature measuring group 63 reaches more than 100 ℃, the time of the step is controlled to be 30-60min to dry the fuel and the mixture, then the power of the heater is increased, the temperature of the first branch pipe 3 is controlled to be 600 ℃ within 30-60min, and the time is more than 500 ℃ and is not less than 10min, so that the fuel can be ignited (the biomass ignition point is generally 400-600 ℃), whether the fuel is ignited is judged according to the change of the temperature of the first temperature measuring point 31 in the heating process, the heater is turned off when the temperature of the first branch pipe 3 is controlled to be gradually reduced to 100 ℃ within 10min after the ignition, the air supply quantity of the first branch pipe 3 is gradually reduced to the working condition requirement, and the furnace is started.
S4, closing the first branch pipe 3, adopting the second branch pipe 4 to supply oxygen to the combustion chamber 5 so that gas passes through the cooling section, cooling ash materials after smoldering in the cooling section while supplying oxygen to the combustion chamber 5, and simultaneously driving the temperature of the ash materials to the mixture above, and drying the mixture.
S5, detecting smoldering states in the combustion chamber by the detection unit, driving the corresponding ignition unit to start or increase the oxygen supply of the oxygen supply unit according to the detection result, wherein when the second temperature measuring point of the smoldering section detects that the temperature of a corresponding area is reduced or the smoldering height is lower than that of an adjacent area, controlling the second branch pipe 4 of the corresponding area to increase the oxygen supply amount, if the increased oxygen supply amount is detected to have no obvious change, closing the corresponding second branch pipe 4, starting the corresponding ignition unit to perform re-ignition, quickly controlling the air supply temperature of the first branch pipe 3 to 600 ℃ to blow high-temperature air within 1-5 minutes, quickly supplementing the combustion speed, ensuring that the full smoldering of the area is reasonably switched to the second branch pipe 4, and when judging that the smoldering speed of a certain area is too high in the operation process, indicating that the smoldering area is moved upwards, reducing the air quantity of the second branch pipe 4, slowing down the combustion speed and reaching the normal smoldering area.
Specifically, all temperature point data of each layer are taken to calculate the mean value (calculation after eliminating dead points, namely, the temperature display is greatly different from other temperatures of the same layer and is regarded as the dead points)
Wherein the method comprises the steps ofRepresenting the average value of the temperature of a certain layer, corresponding to the layerThe number of effective temperature points (reject dead points).
Calculating standard deviation of temperature of a certain layer
Wherein the method comprises the steps ofThe standard deviation is indicated as such,Represent the firstA data point is provided for each of the data points,
Non-uniform (discrete) coefficients of a certain layerComparison of degree of data dispersion.
The data can show that the smaller the standard deviation and the non-uniformity coefficient, the more concentrated the data, that is, the smaller the fluctuation of the cooling section, the smoldering section and the drying section, the better the flatness of the horizontal plane, and the ideal working condition. The larger the standard deviation and the non-uniform (discrete) coefficient, the more dispersed the data, that is, the larger the fluctuation of the cooling section, the smoldering section and the drying section, the worse the working condition.
Difference d=between each temperature point of a certain layer;
Standard score;
Represent the firstThe standard fraction of the data points is used for representing the measurement of a certain number in a group of data relative positions, so that the measured values of each region of the four layers of temperatures can be compared together, and the working condition adjustment is facilitated.
The temperature data is periodically calculated once every N1min (N1 is more than or equal to 1, and the operator interface is set), so that the requirement can be met.
The calculation process comprises the following steps:
1. calculating a certain layer of non-uniformity (discrete) coefficients ;
2. Judging:
;
;
;
3. calculating standard fraction of each temperature point of a certain layer
;
;
;
4. Calculating an adjustment state value for each point of each layer
In the middle ofFirst, theLayer non-uniformity (discrete) coefficients,First, theLayer numberA standard score for a point;
5. calculating the sum of the regulating state values of the corresponding points of each temperature measuring point of the four layers 。
Because of the slow smoldering speed, the adjusting frequency of the working condition air door is periodically adjusted once every N2min (N2 is more than or equal to 5, and the operator interface is set), and only 4 second branch pipes 4 with the maximum, the secondary large, the secondary small and the minimum are adjusted each time.
The calculation process comprises the following steps:
1. Calculating the sum and the average value of the corresponding point adjustment state values in the period ;
2. By combining all pointsThe values are ordered by size;
3. Find out 4 Second branch pipes 4 corresponding to the largest, next smallest and smallest values;
4. adjusting the corresponding 4 second branch pipes 4 controls increasing or decreasing Values.
S6, discharging part of the material ash from the discharge hole 12 according to the detection result of the detection unit, and manually or automatically discharging the material ash from the bottom of the combustion chamber 5 when the second temperature measuring points in the cooling section show that the temperature of the area reaches the preset range.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (7)
1. A flameless combustion furnace, comprising:
The furnace comprises a furnace body (1), wherein a cavity is formed in the middle of the furnace body (1), the furnace body (1) and the cavity are both cylinders, the cavity and the furnace body (1) are coaxially arranged, an annular combustion chamber (5) is formed between the outer surface of the cavity and the outer surface of the furnace body (1), a feed inlet (11) is formed at the upper end of the furnace body (1), and a discharge outlet (12) is formed at the lower end of the furnace body (1);
The oxygen supply unit comprises a total flow pipe (2), one end of the total flow pipe (2) is positioned on the central axis of the cavity, and the other end of the total flow pipe (2) is positioned outside the furnace body (1);
a plurality of ignition units, one end of each ignition unit is connected with one end of the main flow pipe (2), the other end of each ignition unit is connected with the combustion chamber (5), the ignition units are positioned at the same height and are uniformly distributed along the circumferential direction of the furnace body (1);
The detecting unit is arranged on the inner wall of the combustion chamber (5) and used for detecting a smoldering state in the combustion chamber (5), the detecting unit comprises a first temperature measuring group (61), a second temperature measuring group (62), a third temperature measuring group (63) and a fourth temperature measuring group (64), the first temperature measuring group (61), the second temperature measuring group (62), the third temperature measuring group (63) and the fourth temperature measuring group (64) are arranged at intervals from bottom to top along the central axis direction of the combustion chamber (5), and the first temperature measuring group (61), the second temperature measuring group (62), the third temperature measuring group (63) and the fourth temperature measuring group (64) comprise a plurality of second temperature measuring points which are arranged at intervals along the circumferential direction of the combustion chamber (5).
2. The flameless combustion furnace according to claim 1, wherein the ignition unit comprises a first branch pipe (3), a heater and a first temperature measuring point (31), the first branch pipe (3) is connected with a first control valve, two ends of the first branch pipe (3) are respectively communicated with the total flow pipe (2) and the combustion chamber (5) for transmitting oxygen in the total flow pipe (2) to the combustion chamber (5), the heater and the first temperature measuring point (31) are both arranged on the first branch pipe (3), the first temperature measuring point (31) is arranged between the heater and the combustion chamber (5), the heater is used for heating gas in the first branch pipe (3), and the first temperature measuring point (31) is used for detecting the temperature of the gas in the first branch pipe (3).
3. Flameless combustion furnace according to claim 2, characterized in that the oxygen supply unit further comprises a plurality of second branch pipes (4), the second branch pipes (4) are connected with second control valves, both ends of the second branch pipes (4) are respectively connected with the main flow pipe (2) and the combustion chamber (5), the plurality of second branch pipes (4) are uniformly arranged at intervals around the circumferential direction of the combustion chamber (5), the plurality of second branch pipes (4) are positioned at the same height, and the second branch pipes (4) are positioned below the ignition unit.
4. A flameless combustion furnace according to claim 3, characterized in that the number of second temperature measuring points of the first temperature measuring group (61), the second temperature measuring group (62), the third temperature measuring group (63) and the fourth temperature measuring group (64) is the same as the number of ignition units and corresponds one to one.
5. Flameless combustion furnace according to claim 1, characterized in that the top of the cavity is provided with a cone structure, the feed opening (11) being located above the apex of the cone structure.
6. A method of controlling a flameless combustion furnace according to any one of claims 1 to 5, comprising the steps of:
s1, adding fuel into a combustion chamber (5) to enable the fuel to cover and be higher than an ignition unit;
S2, adding a mixture mixed with a heat storage material, fuel and solid waste above the fuel in a staged manner;
S3, feeding high-temperature hot air into the combustion chamber (5) by adopting an ignition unit so as to smoldering fuel and drying the mixture above the fuel;
s4, continuously supplying oxygen to the combustion chamber (5) by the oxygen supply unit;
s5, detecting a smoldering state in the combustion chamber by the detection unit, and driving the corresponding ignition unit to start or increase the oxygen supply amount of the oxygen supply unit according to the detection result;
S6, discharging part of the material ash from the discharge hole (12) according to the detection result of the detection unit.
7. The method according to claim 6, wherein in S5, the ignition unit is controlled to ignite the partial area if the detection unit detects that the partial area is not smoldering, and the oxygen supply amount of the area is increased if it is detected that the smoldering of the vertical area is slower.
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| CN202792005U (en) * | 2012-08-14 | 2013-03-13 | 徐州燃控科技股份有限公司 | Pulverized coal boiler weak breath ignition device |
| CN202757416U (en) * | 2012-08-16 | 2013-02-27 | 北京科技大学 | Novel shaft kiln |
| AT515859B1 (en) * | 2014-06-12 | 2019-10-15 | Innio Jenbacher Gmbh & Co Og | Internal combustion engine |
| CN109185891B (en) * | 2018-10-18 | 2025-04-15 | 浙江宜可欧环保科技有限公司 | Smoldering furnace and oily sludge treatment device containing the smoldering furnace |
| CN209819558U (en) * | 2019-03-05 | 2019-12-20 | 昆山市广进热处理有限公司 | Explosion-proof type hydrogen safety ignition device |
| US11937614B2 (en) * | 2021-05-14 | 2024-03-26 | Haier Us Appliance Solutions, Inc. | Smoke generating assembly for an indoor smoker |
| CN114857592B (en) * | 2022-04-27 | 2024-05-07 | 香港理工大学深圳研究院 | Super-enthalpy smoldering system and method based on tail gas flame backheating |
| CN114935614B (en) * | 2022-05-24 | 2024-02-23 | 安徽理工大学 | Simulation experiment device and method for analyzing coal afterburning characteristics |
| CN119103565A (en) * | 2024-09-04 | 2024-12-10 | 大唐清苑热电有限公司 | Boiler air distribution system and method |
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| CN2054868U (en) * | 1989-09-01 | 1990-03-21 | 程诗俊 | Double-empty type multi-purpose energy-saving coal stove |
| CN109185904A (en) * | 2018-10-30 | 2019-01-11 | 河南科技大学 | A kind of movable environmental protection stalk calciner |
| CN111781238A (en) * | 2019-04-04 | 2020-10-16 | 应急管理部化学品登记中心 | Dust layer smoldering simulation research device and its application |
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