Combustion furnace

Abstract

The utility model relates to the technical field of combustion furnaces, and discloses a combustion furnace which comprises a shell and a flue gas conveying pipe, a cavity chamber is formed in the shell and comprises a combustion chamber and a ventilation chamber, the combustion chamber is located above the ventilation chamber, an operation cover is formed on the shell and provided with a first open end and a second open end which are opposite, and the first open end and the second open end are communicated with each other. In the direction from the first open end to the second open end, the area of the cross section of the operation cover is gradually increased, the operation cover is provided with a feeding cavity and a ventilation cavity which are communicated with the first open end, a discharging port of the feeding cavity is communicated with a feeding port of the combustion chamber, and an air outlet of the ventilation cavity is communicated with an air inlet of the ventilation chamber; a smoke outlet communicated with the combustion chamber is formed in the shell, one end of the smoke conveying pipe is communicated with the smoke outlet, and the other end of the smoke conveying pipe is used for being communicated with the heat dissipation assembly. Through the arrangement of the operation cover, the feeding cavity and the ventilation cavity are independently arranged, so that fuel is more fully mixed with oxygen and combusted, and meanwhile, the fuel is convenient to add, and the combustion condition is convenient to check.

Description

Technical Field

[0001] This disclosure relates to the field of combustion furnace technology, and more specifically, to a combustion furnace. Background Technology

[0002] Combustion furnaces, as core equipment for converting the chemical energy of fuel into thermal energy, are widely used in industrial heating, power generation, and waste treatment. With increasingly stringent modern energy and environmental protection requirements, higher standards are being set for combustion efficiency, pollutant emission control, and operational safety of combustion furnaces. While traditional combustion furnaces possess basic combustion functions, they still have many shortcomings in areas such as fuel supply, air-fuel ratio regulation, combustion stability, and operation and maintenance.

[0003] Currently, traditional combustion furnaces have the following shortcomings: (1) Uneven mixing of fuel and air. Most traditional combustion furnaces use simple feed inlets and air duct structures, lacking effective guidance and control methods, which makes it difficult for fuel and air to be fully mixed, affecting combustion efficiency and easily producing harmful gases such as carbon monoxide. (2) Limited operating space and inconvenient maintenance. The operating area structure of conventional combustion furnaces is simple and lacks reasonable channel design, making it inconvenient to add fuel, observe the combustion status and clean the interior, increasing the intensity of manual labor and reducing operating efficiency. (3) Unstable combustion process. Due to the lack of good airflow organization design, combustion fluctuations or even flameout are likely to occur under low load or variable operating conditions, affecting the continuity and safety of equipment operation. Utility Model Content

[0004] The purpose of this disclosure is to provide a combustion furnace to solve the technical problems existing in the related art.

[0005] To achieve the above objectives, this disclosure provides a combustion furnace, including a shell and a flue gas conveying pipe;

[0006] The housing has an internal cavity, which includes a combustion chamber and a ventilation chamber, with the combustion chamber located above the ventilation chamber.

[0007] An operating cover is formed on the housing. The operating cover has a first open end and a second open end that are opposite to each other. The cross-sectional area of ​​the operating cover gradually increases along the direction from the first open end to the second open end. The operating cover has a feeding chamber and a ventilation chamber that are respectively connected to the first open end. The discharge port of the feeding chamber is connected to the inlet of the combustion chamber. The air outlet of the ventilation chamber is connected to the air inlet of the ventilation chamber.

[0008] The housing has a flue gas outlet that communicates with the combustion chamber. One end of the flue gas delivery pipe is connected to the flue gas outlet, and the other end of the flue gas delivery pipe is used to communicate with the heat dissipation component.

[0009] Optionally, the operating cover includes a cover body and a first partition;

[0010] The cover is formed as a hollow frustum structure, and the first partition is located inside the cover to separate the feed chamber and the ventilation chamber;

[0011] The first open end includes a first sub-open end communicating with the feed chamber and a second sub-open end communicating with the ventilation chamber, and the first sub-open end and the second sub-open end are separated by the first partition.

[0012] Optionally, the first partition is configured to be inclinedly arranged within the enclosure, the first partition having a first end near the first open end and a second end near the second open end, the height of the first end of the first partition being less than the height of the second end of the first partition.

[0013] Optionally, the operating cover further includes a gate and a baffle;

[0014] The gate is rotatably connected to the cover and can expose or cover the feed chamber;

[0015] The gate is provided with an observation hole, and the baffle is rotatably connected to the gate and can expose or cover the observation hole.

[0016] Optionally, the combustion furnace further includes a second baffle;

[0017] A support portion is formed on the inner wall of the housing. The support portion is an annular protrusion extending circumferentially along the cavity to separate the combustion chamber and the ventilation chamber.

[0018] The second partition is configured to overlap the top surface of the support portion;

[0019] The second partition is a perforated plate.

[0020] Optionally, the combustion furnace further includes a reinforcing rod;

[0021] There are multiple reinforcing rods, and the multiple reinforcing rods are spaced apart at the bottom of the support part along the radial direction of the support part.

[0022] Optionally, the diameter of the second partition is larger than the inner diameter of the support portion;

[0023] The length of the reinforcing rod is greater than the inner diameter of the support.

[0024] Optionally, the housing includes a housing body and a smoke collection hood;

[0025] The top of the housing body has an opening;

[0026] Along the direction from top to bottom, the cross-sectional area of ​​the smoke hood gradually increases. The top of the smoke hood has the exhaust port, and the bottom of the smoke hood has the connection port, which is used to communicate with the opening. The smoke hood and the housing body together define the cavity.

[0027] Optionally, the combustion furnace further includes a plurality of refractory bricks, which are arranged at circumferential intervals along the combustion chamber to form a refractory brick group.

[0028] Optionally, there are multiple refractory brick groups, and the multiple refractory brick groups are spaced apart along the axial direction of the combustion chamber;

[0029] The top surface of the refractory brick group located at the first end of the plurality of refractory brick groups is flush with the plane where the opening is located, and the bottom surface of the refractory brick group located at the last end of the plurality of refractory brick groups is in contact with the top surface of the support.

[0030] Through the aforementioned technical solution, the operating hood allows for independent configuration of the feed chamber and ventilation chamber, each leading to the combustion chamber and ventilation chamber respectively. This design enables more precise regulation of fuel and oxygen supply, thereby improving combustion efficiency. Furthermore, the gradually increasing cross-sectional area of ​​the operating hood from the first open end to the second open end helps to create an optimized airflow pattern during combustion, allowing the fuel in the combustion chamber to mix more thoroughly with oxygen and burn more completely, reducing the formation of incomplete combustion products. On the other hand, it facilitates adding fuel to the combustion chamber, checking the fuel combustion status, and performing maintenance work on the combustion furnace. For example, the larger opening facilitates cleaning or replacing components inside the combustion chamber. Additionally, the installed flue gas delivery pipe not only guides the high-temperature flue gas generated during combustion from the combustion chamber to the heat dissipation components for effective heat utilization, but also directs the flue gas to a safe location for discharge, thus avoiding damage to the surrounding environment and equipment.

[0031] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of a combustion furnace provided in an exemplary embodiment of the present disclosure;

[0034] Figure 2 This is a cross-sectional schematic diagram of a combustion furnace provided in an exemplary embodiment of this disclosure.

[0035] Explanation of reference numerals in the attached figures

[0036] 10. Shell; 11. Cavity; 111. Combustion chamber; 1111. Feed inlet; 112. Ventilation chamber; 1121. Air inlet; 12. Smoke outlet; 13. Shell body; 131. Opening; 14. Smoke hood; 141. Connection port; 20. Smoke conveying pipe; 30. Operating hood; 31. Feed chamber; 311. Discharge port; 32. Ventilation chamber; 321. Air outlet; 33. Cover body; 34. First partition; 35. Gate; 351. Observation hole; 36. Baffle; 40. Second partition; 50. Support part; 60. Reinforcing rod; 70. Refractory brick; 80. Handle. Detailed Implementation

[0037] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0038] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation, and therefore should not be construed as a limitation of this disclosure. For example, see [link to relevant documentation]. Figure 1 , Figure 1 The area above the plane of the image is considered "above". Figure 1 The direction above the drawing is "below," and "inside" and "outside" refer to the inside and outside of the corresponding structural outline. Furthermore, terms such as "first" and "second" are used only for descriptive distinction and should not be interpreted as indicating or implying relative importance.

[0039] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0040] like Figures 1 to 2As shown, this disclosure provides a combustion furnace, including a shell 10 and a flue gas conveying pipe 20. The shell 10 has an internal cavity 11, which includes a combustion chamber 111 and a ventilation chamber 112. The combustion chamber 111 is located above the ventilation chamber 112. An operating hood 30 is formed on the shell 10. The operating hood 30 has a first open end and a second open end, which are opposite to each other. The cross-sectional area of ​​the operating hood 30 gradually increases along the direction from the first open end to the second open end. The operating hood 30 has a feed chamber 31 and a ventilation chamber 32, which are respectively connected to the first open end. The discharge port 311 of the feed chamber 31 is connected to the feed port 1111 of the combustion chamber 111. The air outlet 321 of the ventilation chamber 32 is connected to the air inlet 1121 of the ventilation chamber 112. A flue gas outlet 12 is formed on the shell 10, which is connected to the combustion chamber 111. One end of the flue gas conveying pipe 20 is connected to the flue gas outlet 12, and the other end of the flue gas conveying pipe 20 is used to connect to a heat dissipation component.

[0041] Combustion chamber 111 is used for fuel combustion.

[0042] The ventilation chamber 112 is located below the combustion chamber 111 and is used for air circulation to support combustion.

[0043] Through the above technical solution, the operating hood 30 allows the feed chamber 31 and ventilation chamber 32 to be independently configured, each leading to the combustion chamber 111 and ventilation chamber 112 respectively. This design allows for more precise regulation of fuel and oxygen supply, thereby improving combustion efficiency. Furthermore, since the cross-sectional area of ​​the operating hood 30 gradually increases from the first open end to the second open end, it helps to create an optimized airflow pattern during combustion, allowing the fuel in the combustion chamber 111 to mix more fully with oxygen and burn, reducing the generation of incomplete combustion products. On the other hand, it facilitates adding fuel to the combustion chamber 111, checking the fuel combustion status, and performing maintenance work on the combustion furnace. For example, the larger opening 131 facilitates cleaning or replacing components inside the combustion chamber 111. In addition, the flue gas delivery pipe 20 not only guides the high-temperature flue gas generated during combustion from the combustion chamber 111 to the heat dissipation components for effective heat utilization, but also directs the flue gas to a safe location for discharge, thus avoiding damage to the surrounding environment and equipment.

[0044] As one embodiment of the operating cover 30, such as Figures 1 to 2 As shown, the operating cover 30 includes a cover body 33 and a first partition 34. The cover body 33 is formed into a hollow frustum structure. The first partition 34 is located inside the cover body 33 to separate the feeding chamber 31 and the ventilation chamber 32. The first open end includes a first sub-open end communicating with the feeding chamber 31 and a second sub-open end communicating with the ventilation chamber 32. The first sub-open end and the second sub-open end are separated by the first partition 34.

[0045] The first partition 34 separates the interior of the enclosure 33 into two independent spaces: the feed chamber 31 and the ventilation chamber 32. This allows fuel and air to enter the combustion chamber 111 through different paths. This design, on the one hand, allows for better control of the fuel-air mixing ratio, improving combustion efficiency and reducing the generation of incomplete combustion products, thereby reducing the release of harmful emissions and benefiting environmental protection. On the other hand, it reduces safety hazards caused by improper mixing, such as the risk of explosion. Furthermore, the separation of the feed chamber 31 and the ventilation chamber 32 facilitates individual inspection, maintenance, and cleaning of each chamber by personnel.

[0046] The first sub-open end can also be understood as the discharge port 311 of the feed chamber 31. The second sub-open end can also be understood as the air outlet 321 of the ventilation chamber 32.

[0047] As one implementation method, such as Figure 2 As shown, the first partition 34 is configured to be inclinedly arranged inside the cover 33. The first partition 34 has a first end near the first open end and a second end near the second open end. The height of the first end of the first partition 34 is less than the height of the second end of the first partition 34.

[0048] The inclined first baffle 34 forms a channel with a certain slope in the feed chamber 31, which can guide the fuel entering the combustion chamber 111. Specifically, when the fuel enters the feed chamber 31 from the second open end, the fuel can fall more smoothly into the bottom of the combustion chamber 111 under its own gravity along the surface of the inclined first baffle 34, thereby reducing the risk of blockage or accumulation.

[0049] Furthermore, since the fuel in the combustion chamber 111 may generate a certain positive pressure or airflow disturbance during combustion, the guide structure formed by the inclined baffle can block the flue gas from flowing back to the feed chamber 31 to a certain extent, which can prevent backfire. That is, by controlling the airflow velocity difference between the feed chamber 31 and the ventilation chamber 32, the risk of flame backflashing along the feed direction can be effectively reduced.

[0050] In addition, the tilt angle of the first baffle 34 can also create a synergistic effect with the airflow direction of the ventilation cavity 32. When air enters the ventilation chamber 112 from the ventilation cavity 32, it can form a better contact angle with the fuel sliding down the baffle, promoting initial mixing and improving ignition efficiency and combustion stability.

[0051] As one implementation method, such as Figure 1As shown, the operating cover 30 also includes a gate 35 and a baffle 36. The gate 35 is rotatably connected to the cover body 33 and can expose or cover the feed chamber 31. An observation hole 351 is provided on the gate 35. The baffle 36 is rotatably connected to the gate 35 and can expose or cover the observation hole 351.

[0052] The gate 35 can be opened when needed (exposing the feed chamber 31) to add fuel; it can also be closed (covering the feed chamber 31) to control airflow and heat loss during combustion.

[0053] With the observation hole 351 and baffle 36 provided, the observation hole 351 can be opened and closed by rotating the baffle 36. This design allows the staff to view the inside of the feed chamber 31 and the combustion chamber 111 without opening the gate 35, which can reduce the potential risks to the staff caused by high temperature, smoke and other hazardous substances.

[0054] As one implementation method, such as Figure 2 As shown, the combustion furnace also includes a second partition 40. A support portion 50 is formed on the inner side wall of the shell 10. The support portion 50 is an annular protrusion extending circumferentially along the cavity 11 to separate the combustion chamber 111 and the ventilation chamber 112. The second partition 40 is configured to overlap the top surface of the support portion 50. The second partition 40 is constructed as a perforated plate.

[0055] The support portion 50 is used to separate the combustion chamber 111 and the ventilation chamber 112, and to provide support for the second partition 40.

[0056] The second baffle 40 supports the fuel within the combustion chamber 111. Its perforated structure allows air to flow upwards from the ventilation chamber 112 into the combustion chamber 111, while effectively preventing large pieces of unburned fuel or ash from falling directly into the ventilation chamber 112, thus avoiding blockage of the ventilation channels and maintaining good air intake efficiency in the ventilation chamber 112. Furthermore, the second baffle 40 is installed on the support 50 in an overlapping manner for easy disassembly and replacement.

[0057] As one implementation method, such as Figure 2 As shown, the combustion furnace also includes reinforcing rods 60, and there are multiple reinforcing rods 60, which are spaced apart at the bottom of the support 50 along the radial direction of the support 50.

[0058] Since multiple reinforcing rods 60 are spaced apart at the bottom of the support portion 50 along the radial direction of the support portion 50, the multiple reinforcing rods 60 can help distribute the load applied to the support portion 50 (including the weight of fuel in the combustion chamber 111 and various forces generated during combustion, such as thermal stress)). That is, by transferring the load to a wider area of ​​the combustion furnace shell 10, the phenomenon of local stress concentration can be reduced, thereby reducing the risk of deformation or damage to the support portion 50.

[0059] To achieve the goal of overlapping the second partition 40 with the support 50, as one implementation method, such as... Figure 2 As shown, the diameter of the second partition 40 is greater than the inner diameter of the support 50, and the length of the reinforcing rod 60 is greater than the inner diameter of the support 50.

[0060] Since the length of the reinforcing rod 60 is greater than the inner diameter of the support part 50, this setting can not only increase the support area of ​​the entire support part 50 and provide additional support force, thereby enhancing the stability of the overall structure, but also effectively reduce the risk of deformation of the support part 50 due to high temperature or gravitational stress.

[0061] As one implementation method, such as Figures 1 to 2 As shown, the housing 10 includes a housing body 13 and a smoke hood 14. The top of the housing body 13 has an opening 131. The cross-sectional area of ​​the smoke hood 14 gradually increases from top to bottom. A smoke exhaust port 12 is formed at the top of the smoke hood 14, and a connection port 141 is formed at the bottom of the smoke hood 14. The connection port 141 is used to communicate with the opening 131. The smoke hood 14 and the housing body 13 together define a cavity 11.

[0062] The cross-sectional area of ​​the smoke hood 14 gradually increases from top to bottom, forming a funnel-like effect. This design effectively guides and concentrates the flue gas generated during combustion, allowing it to be smoothly collected and discharged through the exhaust port 12. Furthermore, it reduces the possibility of flue gas flowing back into the combustion chamber 111, helping to maintain the stability and efficiency of the combustion process.

[0063] As one implementation method, such as Figure 2 As shown, the combustion furnace also includes a plurality of refractory bricks 70, which are arranged at intervals along the circumference of the combustion chamber 111 to form a group of refractory bricks 70.

[0064] The arrangement of 70 refractory bricks effectively protects the furnace structure from direct erosion by high-temperature flames and gases, thus extending the furnace's service life. It also allows for a certain degree of thermal expansion and contraction, reducing stress concentration caused by temperature changes and preventing cracking or damage to the refractory bricks. Furthermore, the spacing of the refractory bricks limits crack propagation; even if a crack appears in one brick, it won't easily affect adjacent bricks, helping to maintain the integrity of the entire refractory layer.

[0065] Optionally, the surface of the refractory brick 70 can be designed to have a certain reflectivity to help reflect heat back to the combustion zone, which can increase combustion efficiency while reducing heat loss.

[0066] As one implementation method, such as Figure 2 As shown, there are multiple refractory brick groups 70, which are spaced apart along the axial direction of the combustion chamber 111. The top surface of the refractory brick group 70 located at the first end of the multiple refractory brick groups 70 is flush with the plane where the opening 131 is located, and the bottom surface of the refractory brick group 70 located at the last end of the multiple refractory brick groups 70 is in contact with the top surface of the support part 50.

[0067] The axial multi-layer arrangement allows for appropriate expansion gaps between the 70 sets of refractory bricks in each layer, which can alleviate stress concentration caused by temperature differences.

[0068] Each set of refractory bricks 70 adopts a modular design and is installed in layers along the axial direction, which facilitates the inspection and replacement of damaged refractory bricks 70 layer by layer without removing the entire combustion chamber 111 lining.

[0069] The number of refractory brick layers can be increased or decreased by 70 depending on the key parts of the combustion chamber 111 (such as the flame zone and high-temperature zone), which helps to save costs.

[0070] To facilitate the transportation of the combustion furnace to the designated location, optionally, such as Figure 1 As shown, handles 80 can be provided on opposite sides of the housing 10, so that workers can use the handles 80 to move the entire combustion furnace to a designated location.

[0071] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0072] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0073] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A combustion furnace, characterized in that, Includes a housing (10) and a flue gas delivery pipe (20); The housing (10) has an interior cavity (11) which includes a combustion chamber (111) and a ventilation chamber (112), with the combustion chamber (111) located above the ventilation chamber (112). An operating cover (30) is formed on the housing (10). The operating cover (30) has a first open end and a second open end opposite to each other. The cross-sectional area of ​​the operating cover (30) gradually increases along the direction from the first open end to the second open end. The operating cover (30) has a feeding chamber (31) and a ventilation chamber (32) respectively connected to the first open end. The discharge port (311) of the feeding chamber (31) is connected to the inlet port (1111) of the combustion chamber (111). The air outlet (321) of the ventilation chamber (32) is connected to the air inlet port (1121) of the ventilation chamber (112). The housing (10) has a smoke exhaust port (12) that communicates with the combustion chamber (111). One end of the flue gas conveying pipe (20) is connected to the smoke exhaust port (12), and the other end of the flue gas conveying pipe (20) is used to communicate with the heat dissipation component.

2. The combustion furnace according to claim 1, characterized in that, The operating cover (30) includes a cover body (33) and a first partition (34); The cover (33) is formed as a hollow frustum structure, and the first partition (34) is located inside the cover (33) to separate the feed chamber (31) and the ventilation chamber (32). The first open end includes a first sub-open end communicating with the feed chamber (31) and a second sub-open end communicating with the ventilation chamber (32), and the first sub-open end and the second sub-open end are separated by the first partition (34).

3. The combustion furnace according to claim 2, characterized in that, The first partition (34) is configured to be tilted inside the cover (33). The first partition (34) has a first end near the first open end and a second end near the second open end. The height of the first end of the first partition (34) is less than the height of the second end of the first partition (34).

4. The combustion furnace according to claim 2, characterized in that, The operating cover (30) also includes a gate (35) and a baffle (36); The gate (35) is rotatably connected to the cover (33) and can expose or cover the feed chamber (31). The gate (35) is provided with an observation hole (351), and the baffle (36) is rotatably connected to the gate (35) and can expose or cover the observation hole (351).

5. The combustion furnace according to claim 1, characterized in that, The combustion furnace also includes a second baffle (40); A support portion (50) is formed on the inner wall of the housing (10). The support portion (50) is an annular protrusion extending circumferentially along the cavity (11) to separate the combustion chamber (111) and the ventilation chamber (112). The second partition (40) is configured to overlap the top surface of the support (50); The second partition (40) is constructed as a perforated plate.

6. The combustion furnace according to claim 5, characterized in that, The combustion furnace also includes a reinforcing rod (60). There are multiple reinforcing rods (60), and the multiple reinforcing rods (60) are spaced apart at the bottom of the support (50) along the radial direction of the support (50).

7. The combustion furnace according to claim 6, characterized in that, The diameter of the second partition (40) is larger than the inner diameter of the support (50); The length of the reinforcing rod (60) is greater than the inner diameter of the support (50).

8. The combustion furnace according to any one of claims 4-7, characterized in that, The housing (10) includes a housing body (13) and a smoke hood (14). The top of the housing body (13) has an opening (131). Along the direction from top to bottom, the cross-sectional area of ​​the smoke hood (14) gradually increases. The top of the smoke hood (14) is formed with the smoke exhaust port (12), and the bottom of the smoke hood (14) is formed with the connection port (141). The connection port (141) is used to communicate with the opening (131). The smoke hood (14) and the shell body (13) together define the cavity (11).

9. The combustion furnace according to claim 8, characterized in that, The combustion furnace also includes a plurality of refractory bricks (70), which are arranged at intervals along the circumference of the combustion chamber (111) and form a group of refractory bricks (70).

10. The combustion furnace according to claim 9, characterized in that, There are multiple groups of refractory bricks (70), and the multiple groups of refractory bricks (70) are arranged at intervals along the axial direction of the combustion chamber (111); Among them, the top surface of the refractory brick (70) group located at the first end of the plurality of refractory brick (70) groups is flush with the plane where the opening (131) is located, and the bottom surface of the refractory brick (70) group located at the last end of the plurality of refractory brick (70) groups is in contact with the top surface of the support (50).

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