A self-igniting type heat recovery device and system for coal gangue tunnel kiln

Abstract

The present invention provides a self-igniting coal gangue tunnel kiln heat recovery device and system, including: a modular kiln boiler arranged in the cooling section of the tunnel brick kiln, the modular kiln boiler including a top wall and side walls, the top wall and side walls being an integrated structure, a superheater heating module, a convection tube bundle heating module and an economizer heating module being sequentially installed in the modular kiln boiler, the superheater heating module, the convection tube bundle heating module and the economizer heating module being respectively connected to a boiler drum arranged outside the tunnel brick kiln, the boiler drum being arranged on the ground, and a plurality of tunnel brick kilns can share one boiler drum; the present invention completely abandons the traditional design idea of adding a heating surface to a tunnel brick kiln as the basis of a waste heat boiler, and manufactures a modular kiln boiler separately, with low overall air leakage rate, reasonable layout, high heat utilization efficiency and low cost; it is applicable to the technical field of kiln waste heat recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of kiln waste heat recovery, and in particular to a heat recovery device and system for a self-igniting coal gangue tunnel kiln. Background Art

[0002] The structure of a tunnel brick kiln is a long, straight tunnel with fixed walls and an arch or suspended ceiling on both sides and on the top. The kiln car runs on tracks laid at the bottom, and the combustion section is located in the middle of the tunnel brick kiln, consisting of four fixed sections: preheating section, high-temperature section, firing section, and cooling section. In existing brick kiln waste heat utilization devices, the boiler drum is placed on the kiln roof, and then the kiln roof is opened and pipes are laid on the kiln roof, that is, the kiln roof is converted into a boiler. During the conversion process, the kiln roof must be opened, which affects the sealing of the entire kiln, increases the overall air leakage rate of the kiln, and affects the production capacity of the kiln. At the same time, traditional brick kiln waste heat utilization devices only modify the kiln roof and ignore the modification of the kiln walls. There is still much room for improvement in heat utilization efficiency. On the other hand, the layout of the heating surface of traditional brick kiln waste heat utilization devices is unreasonable, resulting in waste of resources and suboptimal heat exchange effect. Summary of the Invention

[0003] In view of the deficiencies in the relevant technologies, the technical problem to be solved by the present invention is to provide a self-igniting coal gangue tunnel kiln heat recovery device and system, which can greatly reduce the air leakage rate of the tunnel brick kiln. At the same time, a modular kiln boiler arrangement is carried out in the cooling section of the tunnel brick kiln according to the changes in the quality of the waste heat in the kiln, thereby improving the waste heat utilization rate of the cooling section of the tunnel brick kiln.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a self-igniting coal gangue tunnel kiln heat recovery device, comprising: a modular kiln boiler arranged in the cooling section of the tunnel brick kiln, the modular kiln boiler comprising a top wall and side walls, the top wall and side walls being an integral structure, the overall shape and size of the top wall and side walls being respectively adapted to the shape and size of the kiln wall of the tunnel brick kiln, the modular kiln boiler being manufactured separately, the burner head and the furnace tail of the modular kiln boiler being respectively sealedly connected to the tunnel brick kiln and the gaps being filled with sealing material, the modular kiln boiler being sequentially installed with a superheater heating module, a convection tube bundle heating module and an economizer heating module from the burner head to the furnace tail, the superheater heating module, the convection tube bundle heating module and the economizer heating module being respectively connected to a boiler drum arranged outside the tunnel brick kiln;

[0005] The superheater heating module includes a membrane wall heat exchange tube bundle installed close to the top wall and the side wall, and an inter-row heat exchange tube bundle is arranged below the membrane wall heat exchange tube bundle. The membrane wall heat exchange tube bundle and the inter-row heat exchange tube bundle are both arched;

[0006] The convection tube bundle heating module includes a membrane wall heat exchange tube bundle installed closely against the top wall and the side wall, an inter-row heat exchange tube bundle is arranged below the membrane wall heat exchange tube bundle, and a spiral fin heat exchange tube bundle is arranged below the inter-row heat exchange tube bundle, and the membrane wall heat exchange tube bundle, the inter-row heat exchange tube bundle and the spiral fin heat exchange tube bundle are all arched;

[0007] The economizer heating module includes a membrane wall heat exchange tube bundle installed close to the top wall and side walls, and a double-layer spiral fin heat exchange tube bundle is arranged below the membrane wall heat exchange tube bundle. The membrane wall heat exchange tube bundle and the spiral fin heat exchange tube bundle are both arched.

[0008] Preferably, a riser is provided at the top of the top wall, and a downcomer is provided at the bottom of each of the two side walls. One end of the membrane wall heat exchange tube bundle, the inter-row heat exchange tube bundle and the spiral fin heat exchange tube bundle are all connected to the riser, and the other end of the membrane wall heat exchange tube bundle, the inter-row heat exchange tube bundle and the spiral fin heat exchange tube bundle are all connected to the downcomer. The riser and downcomer are respectively connected to the boiler drum.

[0009] Preferably, the superheater heating module, convection tube bundle heating module, and economizer heating module are all coated with insulation material. A self-igniting coal gangue tunnel kiln heat recovery system comprises: a plurality of tunnel kilns arranged side by side and a tunnel kiln waste heat recovery device, wherein the boiler drum is arranged on the ground, and the plurality of tunnel kilns share a common boiler drum.

[0010] The beneficial technical effects of the present invention are:

[0011] 1. The heat recovery device for a self-igniting coal gangue tunnel kiln shown in the present invention replaces the cooling section of the tunnel brick kiln with a modular kiln boiler, and sequentially arranges a superheater heating module, a convection tube bundle heating module and an economizer heating module in the modular kiln boiler according to the changes in the temperature quality in the kiln, and connects them respectively to the boiler drum arranged outside the tunnel brick kiln.

[0012] The present invention completely abandons the traditional design idea of adding a heating surface to a tunnel brick kiln as the basis of a waste heat boiler. In each part of the cooling section, various types of suitable heating modules are reasonably arranged according to the changes in the quality of the waste heat, which greatly improves the efficiency of waste heat recovery in the tunnel brick kiln. At the same time, it avoids the use of the same heating surface in different temperature ranges of the cooling section, which causes problems such as insufficient waste heat absorption in different temperature ranges, unreasonable layout, and excessively high cost.

[0013] 2. The present invention discloses a heat recovery device for a self-igniting coal gangue tunnel kiln. The membrane wall heat exchange tube bundle is designed to effectively address oxygen corrosion and reduce oxygen erosion on the tube bundle. It also serves as a supporting structure for the boiler furnace wall, providing a seal and extending the boiler's service life. The interspaced heat exchange tube bundle utilizes an interspaced structure to create a certain amount of turbulence in the high-temperature gas, effectively increasing the boiler's heat exchange output. The spiral fin heat exchange tube bundle primarily partitions the high-temperature gas within the boiler, slowing its flow rate, facilitating uniform cooling of the bricks and increasing convective heat exchange intensity.

[0014] 3. The heat recovery device for a self-igniting coal gangue tunnel kiln disclosed in this invention utilizes risers and downcomers to connect each heating module to the boiler drum. During operation, condensate or feedwater is first pumped into the economizer heating module. After absorbing some heat, the condensate or feedwater reaches the designed temperature before entering the boiler drum and mixing with saturated water. The saturated water in the boiler drum then flows through the downcomer into the convection tube bundle heating module for heat exchange. The convection tube bundle heating module absorbs waste heat from the sintered bricks in the cooling section, heating the feedwater to saturated water before entering the boiler drum through the riser. Saturated steam generated in the boiler drum enters the superheater heating module through the steam outlet, where it is heated to superheated steam and then enters the steam turbine for power generation or heating. This achieves waste heat recovery from the cooling section of the tunnel kiln.

[0015] 4. The present invention shows a self-igniting coal gangue tunnel kiln heat recovery system, which includes multiple tunnel brick kilns arranged side by side and a tunnel brick kiln waste heat recovery device. The modular kiln boiler is manufactured separately, and the front and rear of the modular kiln boiler are sealed with the tunnel brick kiln and the gap is filled with sealing material; the boiler drum is set on the ground, and the multiple tunnel brick kilns share one boiler drum.

[0016] In the traditional brick kiln waste heat utilization device, the boiler drum is set on the kiln roof, and then the kiln roof of the brick kiln is opened, and the exhaust pipes are arranged on the kiln roof, that is, the kiln roof is converted into a boiler. During the conversion process, the kiln roof must be opened, which affects the sealing of the entire brick kiln, increases the overall air leakage rate of the brick kiln, and also affects the production capacity of the brick kiln. At the same time, the traditional brick kiln waste heat utilization device usually only converts the kiln roof and ignores the conversion of the kiln wall. The heat utilization efficiency still has a lot of room for improvement. The present invention shows a self-igniting coal gangue tunnel kiln heat recovery system. During the construction of the brick kiln, the five parking spaces originally used for boiler conversion after the high-temperature zone are vacated, and the mold is replaced. The block kiln boiler is manufactured separately, and the top and side walls of the separately manufactured modular kiln boiler are an integrated structure, and both the top and side walls are provided with multi-layer heat exchange tube bundles. After the manufacture is completed, the front and rear of the modular kiln boiler are sealed to the brick kiln respectively, and the gap is filled with sealing material; since the modular kiln boiler is manufactured separately, it is not necessary to limit the boiler drum to be set up on the top of the tunnel brick kiln. The boiler drum can also be set on the ground, saving the cost of setting the boiler drum on the top of the kiln, and multiple tunnel brick kiln production lines can share one boiler drum, which further saves costs. At the same time, the steam generated by the waste heat recovery device can be centrally managed to make the generated steam use pressure constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a heat recovery device for a self-igniting coal gangue tunnel kiln provided by an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the installation structure of a self-ignition coal gangue tunnel kiln heat recovery device provided by an embodiment of the present invention;

[0019] Figure 3 1 is a schematic structural diagram of a superheater heating module provided by an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the structure of the convection tube bundle heating module provided by an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of the structure of the economizer heating module provided by an embodiment of the present invention;

[0022] In the figure: 10 is a modular kiln boiler, 101 is a top wall, 102 is a side wall, 103 is a riser, 104 is a downcomer, 105 is insulation material, 20 is a superheater heating surface module, 30 is a convection tube bundle heating module, 40 is an economizer heating module, 50 is a heat exchange tube bundle, 501 is a membrane wall heat exchange tube bundle, 502 is an inter-row heat exchange tube bundle, 503 is a spiral fin heat exchange tube bundle, and 60 is a boiler drum. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, these schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0025] The following is combined with Figure 1-5 An embodiment of the heat recovery device and system for a self-igniting coal gangue tunnel kiln is described in detail.

[0026] like Figure 1-5 As shown, a heat recovery device for a self-igniting coal gangue tunnel kiln may include: a modular kiln boiler 10 arranged in the cooling section of the tunnel brick kiln, the modular kiln boiler 10 may include a top wall 101 and a side wall 102, the top wall 101 and the side wall 102 are an integrated structure, the overall shape and size of the top wall 101 and the side wall 102 are respectively adapted to the shape and size of the kiln wall of the tunnel brick kiln, the modular kiln boiler 10 is sequentially installed with a superheater heating module 20, a convection tube bundle heating module 30 and an economizer heating module 40 from the furnace head to the furnace tail, the superheater heating module 20, the convection tube bundle heating module 30 and the economizer heating module 40 all include a plurality of different heat exchange tube bundles 50, the superheater heating module 20, the convection tube bundle heating module 30 and the economizer heating module 40 are respectively connected to a boiler drum 60 arranged outside the tunnel brick kiln.

[0027] The present embodiment shows a self-igniting coal gangue tunnel kiln heat recovery device, which uses a modular kiln boiler 10 to replace the tunnel brick kiln cooling section, and sequentially arranges a superheater heating module 20, a convection tube bundle heating module 30 and an economizer heating module 40 in the modular kiln boiler 10 according to the changes in the temperature quality in the kiln, and respectively connects them to the boiler drum 60 arranged outside the tunnel brick kiln.

[0028] The present invention completely abandons the traditional design idea of adding a heating surface to a tunnel brick kiln as the basis of a waste heat boiler. In each part of the cooling section, various types of suitable heating modules are reasonably arranged according to the changes in the quality of the waste heat, which greatly improves the efficiency of waste heat recovery in the tunnel brick kiln. At the same time, it avoids the use of the same heating surface in different temperature ranges of the cooling section, which causes problems such as insufficient waste heat absorption in different temperature ranges, unreasonable layout, and excessively high cost.

[0029] Furthermore, the superheater heating module 20 may include a membrane wall heat exchange tube bundle 501 installed close to the top wall 101 and the side wall 102, and an inter-row heat exchange tube bundle 502 is arranged below the membrane wall heat exchange tube bundle 501. The membrane wall heat exchange tube bundle 501 and the inter-row heat exchange tube bundle 502 are both arched.

[0030] Furthermore, the convection tube bundle heating module 30 may include a membrane wall heat exchange tube bundle 501 installed close to the top wall 101 and the side wall 102, an inter-row heat exchange tube bundle 502 is arranged below the membrane wall heat exchange tube bundle 501, and a spiral fin heat exchange tube bundle 503 is arranged below the inter-row heat exchange tube bundle 502. The membrane wall heat exchange tube bundle 501, the inter-row heat exchange tube bundle 502 and the spiral fin heat exchange tube bundle 503 are all arched.

[0031] Furthermore, the economizer heating module 40 may include a membrane wall heat exchange tube bundle 501 installed close to the top wall 101 and the side wall 102, and a double-layer spiral fin heat exchange tube bundle 503 is arranged below the membrane wall heat exchange tube bundle 501. The membrane wall heat exchange tube bundle 501 and the spiral fin heat exchange tube bundle 503 are both arched.

[0032] In the present invention, the membrane wall heat exchange tube bundle 501 is designed to effectively solve oxygen corrosion and reduce oxygen erosion of the tube bundle. At the same time, it also serves as the supporting structure of the boiler furnace wall, plays a sealing role, and extends the service life of the boiler; the inter-row heat exchange tube bundle 502 uses the inter-row structure to make the high-temperature gas produce a certain turbulence, which can effectively increase the heat exchange output of the boiler; the spiral fin heat exchange tube bundle 503 mainly forms a partition in the high-temperature gas in the boiler, slows down the flow rate of the high-temperature gas, is conducive to the uniform cooling of the bricks, and increases the convective heat exchange intensity. The present invention adopts a variety of heat exchange tube bundles 50 with different functions, and according to the changes in the quality of the waste heat of each part of the cooling section, these heat exchange tube bundles 50 are reasonably matched to form heat exchange modules with different functions. While ensuring the waste heat recovery rate in each different temperature range of the cooling section, the layout cost of the heated module is reduced as much as possible to achieve a reasonable layout.

[0033] Furthermore, a riser 103 may be provided at the top of the top wall 101, and a downcomer 104 may be provided at the bottom of each of the two side walls 102. One end of the membrane wall heat exchange tube bundle 501, the inter-row heat exchange tube bundle 502 and the spiral fin heat exchange tube bundle 503 are all connected to the riser 103, and the other end of the membrane wall heat exchange tube bundle 501, the inter-row heat exchange tube bundle 502 and the spiral fin heat exchange tube bundle 503 are all connected to the downcomer 104. The riser 103 and the downcomer 104 are respectively connected to the boiler drum 60.

[0034] This embodiment utilizes riser pipes 103 and downcomers 104 to connect each heating module to the boiler drum 60. During operation, condensate or feedwater is first pumped into the economizer heating module 40. After absorbing some heat, the condensate or feedwater is raised to the designed temperature before entering the boiler drum 60 and mixing with saturated water. The saturated water in the boiler drum 60 then flows through the downcomers into the convection tube bundle heating module 30 for heat exchange. The convection tube bundle heating module 30 absorbs waste heat from the sintered bricks in the cooling section, heating the feedwater to saturated water before entering the boiler drum 60 through the riser pipes. The saturated steam generated in the boiler drum 60 flows through the steam outlet into the superheater heating module 20, where it is heated to superheated steam before entering the steam turbine for power generation or heating. This achieves waste heat recovery and utilization in the cooling section of the tunnel brick kiln.

[0035] Furthermore, the exteriors of the superheater heating module 20 , the convection tube bundle heating module 30 , and the economizer heating module 40 are all coated with a thermal insulation material 105 .

[0036] This embodiment also provides a self-igniting coal gangue tunnel kiln heat recovery system, including: multiple tunnel brick kilns arranged side by side and a tunnel brick kiln waste heat recovery device. The modular kiln boiler 10 is made separately, and the modular kiln boiler 10 is sealedly connected to the tunnel brick kiln at the front and back, and the gap is filled with sealing material.

[0037] Furthermore, the boiler drum 60 is arranged on the ground, and a plurality of tunnel brick kilns can share one boiler drum 60.

[0038] In the traditional tunnel brick kiln waste heat recovery process, the boiler drum 60 is set on the kiln roof, and then the kiln roof of the brick kiln is opened, and the drainage pipes are laid on the kiln roof, that is, the kiln roof is converted into a boiler. During the conversion process, opening the kiln roof will inevitably affect the sealing of the entire brick kiln, increase the overall air leakage rate of the brick kiln, and affect the production capacity of the brick kiln. At the same time, the traditional brick kiln waste heat recovery device usually only converts the kiln roof and ignores the conversion of the kiln wall. The heat utilization efficiency still has a lot of room for improvement. The self-igniting coal gangue tunnel kiln heat recovery system shown in the present invention, during the construction of the brick kiln, first vacates the five parking spaces originally used for boiler conversion after the high-temperature zone, and makes the modular kiln boiler 10 separately. The top wall 101 and side wall 102 of the separately manufactured modular kiln boiler 10 are an integrated structure, and both the top wall 101 and the side wall 102 are provided with multi-layer heat exchange tube bundles. After the production is completed, the modular kiln boiler 10 is sealed to the brick kiln at the front and rear, and the gap is filled with sealing material. Since the modular kiln boiler 10 is manufactured separately, it is not necessary to limit the boiler drum 60 to be set on the top of the tunnel brick kiln. The boiler drum can also be set on the ground, saving the cost of setting the boiler drum 60 on the top of the kiln. Moreover, a boiler drum 60 can be shared by multiple tunnel brick kiln production lines, further saving costs. At the same time, the steam generated by the waste heat recovery device can be centrally managed to make the generated steam use pressure constant.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present invention, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] In the description of this specification, reference to the term "one embodiment" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without conflict.

[0044] It can be understood that the relevant features in the above devices and systems can refer to each other.

[0045] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and modules can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0046] In the embodiments provided herein, it should be understood that the disclosed devices and systems may be implemented in other ways. The system embodiments described above are merely illustrative. For example, the module division is merely a logical functional division, and actual implementations may employ other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not implemented.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-ignition coal gangue tunnel kiln heat recovery device, characterized in that: include: A modular kiln-type boiler (10) is provided in a cooling section of a tunnel brick kiln. The modular kiln-type boiler (10) includes a top wall (101) and a side wall (102). The top wall (101) and the side wall (102) are an integrated structure. The overall shape and size of the top wall (101) and the side wall (102) are respectively adapted to the shape and size of the kiln wall of the tunnel brick kiln. The modular kiln-type boiler (10) is manufactured separately. The burner head and the furnace tail of the modular kiln-type boiler (10) are respectively sealed and connected to the tunnel brick kiln, and the gaps are filled with sealing materials. A superheater heating module (20), a convection tube bundle heating module (30), and an economizer heating module (40) are sequentially installed in the modular kiln-type boiler (10) from the burner head to the furnace tail. The superheater heating module (20), the convection tube bundle heating module (30), and the economizer heating module (40) are respectively connected to a boiler drum (60) provided outside the tunnel brick kiln. The superheater heating module (20) comprises a membrane wall heat exchange tube bundle (501) installed closely against the top wall (101) and the side wall (102), an inter-row heat exchange tube bundle (502) is provided below the membrane wall heat exchange tube bundle (501), and both the membrane wall heat exchange tube bundle (501) and the inter-row heat exchange tube bundle (502) are arched; The convection tube bundle heating module (30) comprises a membrane wall heat exchange tube bundle (501) installed closely against the top wall (101) and the side wall (102); an inter-row heat exchange tube bundle (502) is provided below the membrane wall heat exchange tube bundle (501); a spiral fin heat exchange tube bundle (503) is provided below the inter-row heat exchange tube bundle (502); the membrane wall heat exchange tube bundle (501), the inter-row heat exchange tube bundle (502) and the spiral fin heat exchange tube bundle (503) are all arched; The economizer heating module (40) comprises a membrane wall heat exchange tube bundle (501) installed closely against the top wall (101) and the side wall (102), a double-layer spiral fin heat exchange tube bundle (503) is arranged below the membrane wall heat exchange tube bundle (501), and both the membrane wall heat exchange tube bundle (501) and the spiral fin heat exchange tube bundle (503) are arched.

2. A heat recovery device for a spontaneous combustion coal gangue tunnel kiln according to claim 1, characterized in that: A rising tube (103) is provided at the top of the top wall (101), and a downcomer (104) is provided at the bottom of each of the two side walls (102). One end of each of the membrane wall heat exchange tube bundle (501), the inter-row heat exchange tube bundle (502), and the spiral fin heat exchange tube bundle (503) is connected to the rising tube (103), and the other end of each of the membrane wall heat exchange tube bundle (501), the inter-row heat exchange tube bundle (502), and the spiral fin heat exchange tube bundle (503) is connected to the downcomer (104). The rising tube (103) and the downcomer (104) are respectively connected to the boiler drum (60).

3. The heat recovery device for a spontaneous combustion coal gangue tunnel kiln according to claim 1, characterized in that: The superheater heating module (20), the convection tube bundle heating module (30), and the economizer heating module (40) are all coated with thermal insulation material (105) on their exteriors.

4. A self-ignition coal gangue tunnel kiln heat recovery system, characterized in that: include: A plurality of tunnel brick kilns arranged side by side and a tunnel brick kiln waste heat recovery device, wherein the tunnel brick kiln waste heat recovery device is any one of the self-igniting coal gangue tunnel kiln heat recovery devices described in claims 1-3, the boiler drum (60) is arranged on the ground, and the plurality of tunnel brick kilns share one boiler drum (60).

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