Coal spontaneous combustion simulation test device during secondary mining of closed goaf

Abstract

The utility model discloses a coal spontaneous combustion simulation test device during closed goaf re-mining, which relates to the goaf coal fire disaster prevention and control theory and technical field, and comprises a top opening, a coal bearing furnace body used for laying a coal seam and a gravel layer, a ventilation pipeline, a heating device, a temperature detection device and a closed fire extinguishing device, a through hole is formed in one side of the coal bearing furnace body, a separation net is installed on the through hole, the ventilation pipeline is communicated with the coal bearing furnace body through the through hole, and the working ends of the heating device, the temperature detection device and the closed fire extinguishing device are all located in the coal seam. Therefore, the purpose of researching the formation evolution law of the high-temperature area during spontaneous combustion and fire extinguishing of the compound mining coal after goaf sealing treatment is achieved.

Description

Technical Field

[0001] The utility model relates to the theoretical and technical fields of goaf area coal fire disaster prevention and control, and in particular to a coal spontaneous combustion simulation test device during re-mining in a closed goaf area. Background Art

[0002] Spontaneous combustion of coal in goaf is one of the major disasters in coal mine production. When spontaneous combustion occurs, a large amount of toxic and harmful gases are released, threatening the life, health and safety of underground personnel. If the fire cannot be extinguished directly when a dangerous situation occurs, the fire area needs to be sealed to isolate the inflow of air, and mud or inert gas is injected into the closed fire area to extinguish the fire due to lack of oxygen. When the fire wall is removed for operation after the fire is extinguished, the loose coal body in the goaf still has residual heat, which can easily cause coal spontaneous combustion fire again. However, due to the conditions that the on-site environment of the goaf is invisible and the temperature is difficult to detect, it is impossible to accurately determine the dangerous area of ​​coal spontaneous combustion after re-mining, which brings huge difficulties to mine operations and seriously threatens the lives of workers.

[0003] In the prior art, the application number is CN201620364696.0, the invention name is "A Simulation Test Device for the Distribution Law of the Temperature Field in the Goaf of Coal Mine", and the application number is CN201810889050.8, the invention name is "Real-time Visual Monitoring Device, System and Method for the Temperature Field of Coal Spontaneous Combustion in the Goaf". They do not target the re-mining of closed goafs, but only simulate the inertia injection and fire extinguishing process of coal spontaneous combustion fires and the complex ventilation environment; at the same time, contact temperature measurement methods such as thermocouple temperature measurement are used to construct the temperature field, too many measuring points are arranged, and the temperature field changes discontinuously. The temperature field is constructed by traditional non-contact temperature measurement methods such as infrared thermal imaging methods, which cannot detect the internal temperature of the coal pile, resulting in inaccurate temperature field data. Therefore, it is urgent to invent a targeted test system to study the formation and evolution of the high-temperature area of ​​spontaneous combustion of coal after the goaf is closed, and provide theoretical support for the identification and determination of the dangerous area of ​​spontaneous combustion of coal in the goaf. Utility Model Content

[0004] The utility model provides a test device for simulating spontaneous combustion of coal during re-mining in a closed goaf, so as to achieve the purpose of studying the formation and evolution law of high temperature areas during spontaneous combustion and fire extinguishing of re-mined coal after the goaf is closed.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] A test device for simulating spontaneous combustion of coal during re-mining in a closed goaf, comprising a coal-bearing furnace body with an opening on the top for laying coal seams and sand and gravel layers, and also comprising a ventilation duct, a heating device, a temperature detection device and a closed fire extinguishing device. A through hole is opened on one side of the coal-bearing furnace body, an isolation net is installed on the through hole, the ventilation duct is connected to the coal-bearing furnace body through the through hole, and the working ends of the heating device, the temperature detection device and the closed fire extinguishing device are all located in the coal seam.

[0007] In the utility model, coal seams and gravel layers are laid in sequence on a coal-bearing furnace body to simulate a closed coal mine underground goaf, the ventilation duct simulates the entry of combustion-supporting air into the goaf during re-mining, the heating device simulates the heating and spontaneous combustion of the residual coal, the closed fire extinguishing device simulates fire extinguishing after spontaneous combustion, and a temperature detection device is used to detect the temperature change in the goaf during this process, so as to study the formation and evolution laws of the high-temperature area of ​​spontaneous combustion of re-coal mining after the goaf is closed, and provide theoretical support for the identification and judgment of the dangerous area of ​​spontaneous combustion of coal in the goaf.

[0008] Furthermore, the closed fire extinguishing device includes an inert gas source, a gas pipeline connected to the inert gas source, a plurality of fire extinguishing pipelines and a first flow meter installed on the gas pipeline. The upper ends of the fire extinguishing pipelines are connected to the gas pipeline, and the lower ends are inserted into the coal seam.

[0009] The air in the coal seam is discharged by introducing inert gas into the coal seam from an inert gas source, so that the coal seam lacks combustion-supporting air, thereby achieving the purpose of extinguishing the fire. This replicates the closed fire-extinguishing process of spontaneous combustion of coal in the goaf. At the same time, it will not damage the coal seam and the structure within the coal seam, and has better safety and reliability.

[0010] Furthermore, a number of fire extinguishing pipelines are evenly inserted into the coal seam, so that the inert gas can be evenly and quickly introduced to fill the coal seam, and the air can be discharged as quickly as possible to prevent the coal seam from excessive spontaneous combustion.

[0011] Furthermore, the heating device includes an electric heating controller and a high-temperature thermoelectric heating rod which are connected to each other, and the heating end of the high-temperature thermoelectric heating rod is inserted into the coal seam.

[0012] By inserting high-temperature thermoelectric heating rods into the coal seam to generate heat, local heating and spontaneous combustion in the coal seam are simulated, making the test closer to the actual situation.

[0013] Furthermore, the temperature detection device includes a plurality of temperature sensors and a thermocouple temperature data collector. The temperature sensors are evenly laid in the coal seam, and the temperature sensors are connected to the thermocouple temperature data collector.

[0014] By burying temperature sensors inside the coal seam to detect the temperature inside the coal seam, recording the temperature of the coal seam and its temperature changes, forming a usable data chain, and studying the formation and evolution of high-temperature areas of spontaneous combustion caused by re-mining after the goaf is closed, providing theoretical support for the identification and determination of dangerous areas of spontaneous combustion of coal in the goaf.

[0015] Furthermore, the temperature detection device also includes an acoustic non-contact temperature measuring device, which includes a number of transceiver acoustic wave transducers installed on the side walls of the coal-bearing furnace body, an acoustic signal data collector and an acoustic signal amplifier connected to the transceiver acoustic wave transducers, a acoustic wave transmitter connected to the acoustic signal amplifier, and an acoustic-to-electrical signal converter connected to both the acoustic signal data collector and the acoustic wave transmitter.

[0016] The transceiver acoustic transducer can send and receive sound waves. The sound waves are emitted by one or more transceiver acoustic transducers, pass through the coal seam, and are received by another one or more transceiver acoustic transducers. The sound waves after passing through the coal seam are collected by the acoustic signal data collector. The temperature of the coal sample in the furnace body is accurately measured by acoustic temperature measurement, and the coal sample temperature measured by thermocouple is used for verification, providing feasible conditions for visualizing the temperature of the coal sample in the coal-bearing furnace body.

[0017] Furthermore, the transceiver type sound wave transducer is evenly installed on two opposite side walls of the coal-bearing furnace body.

[0018] Since a through hole needs to be opened on one of the side walls of the coal-bearing furnace body, the two opposite side walls of the coal-bearing furnace body do not include the side wall with the through hole, and all the transceiver acoustic wave transducers on one side emit sound waves in turn, and all the transceiver acoustic wave transducers on the opposite side receive the sound waves, and then all the transceiver acoustic wave transducers on the opposite side emit sound waves in turn, and all the transceiver acoustic wave transducers on this side receive the sound waves, to obtain multiple sets of temperature data and a two-dimensional temperature distribution field of the coal sample temperature in the coal-bearing furnace body, to realize visualization of the temperature field, to facilitate analysis of the formation and evolution of high-temperature areas during the spontaneous combustion of coal after the goaf is closed, and to accurately test the characteristic parameters of coal spontaneous combustion at each stage.

[0019] Furthermore, the ventilation duct includes an air inlet pipeline and an air outlet pipeline, an air source is installed at the inlet end of the air inlet pipeline, a gas chromatograph is installed at the end of the air outlet pipeline, and a second flow meter and a valve are installed on both the air inlet pipeline and the air outlet pipeline.

[0020] Air is injected into the ventilation duct through an air source to simulate the ventilation conditions of re-mining in a closed goaf. A gas chromatograph is used to detect the gas composition and concentration of the return air duct during the spontaneous combustion and fire extinguishing process of the coal sample, and the progress of the spontaneous combustion and fire extinguishing of the coal sample is obtained.

[0021] Furthermore, a refractory insulation layer is laid on the outer wall of the coal-bearing furnace body. The refractory insulation layer is used to reduce the heat exchange between the inside and outside of the coal-bearing furnace body, reduce the flow rate of heat, and reduce the test error.

[0022] Furthermore, it also includes a soundproof box, in which the coal-bearing furnace body is installed, so as to reduce the influence of external sound on the device and reduce the test error.

[0023] One or more technical solutions provided by the utility model have at least the following technical effects or advantages:

[0024] (1) In the utility model, coal seams and gravel layers are laid on the coal-bearing furnace body to simulate the closed coal mine underground goaf, the ventilation duct simulates the entry of residual coal into the goaf during re-mining to support combustion, the heating device simulates the heating and spontaneous combustion of the residual coal, the closed fire extinguishing device simulates the extinguishing of the fire after spontaneous combustion, and the temperature detection device is used to detect the temperature change in the goaf during this process, so as to study the formation and evolution law of the high-temperature area of ​​spontaneous combustion of re-mining coal after the goaf is closed, and provide theoretical support for the identification and determination of the dangerous area of ​​spontaneous combustion of coal in the goaf;

[0025] (2) The air in the coal seam is discharged by introducing inert gas from an inert gas source into the coal seam to achieve the purpose of fire extinguishing, replicating the closed fire extinguishing process of spontaneous combustion of coal in the goaf. At the same time, the coal seam and the structure inside the coal seam will not be damaged, and it has better safety and reliability;

[0026] (3) The temperature inside the coal seam is detected by a temperature sensor and an acoustic non-contact temperature measuring device buried inside the coal seam, and the temperature and temperature changes of the coal seam are recorded to form a usable data link;

[0027] (4) Visualization of temperature field is achieved through acoustic non-contact temperature measurement device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of the present utility model, and do not constitute a limitation on the embodiments of the present utility model;

[0029] Figure 1 It is a top view of the test device in the utility model;

[0030] Figure 2 It is a cross-sectional view of the utility model;

[0031] Figure 3 It is the route map for transmitting and receiving the acoustic wave detection signal in the utility model;

[0032] Among them, 1-coal-bearing furnace body, 101-coal seam, 102-sand and gravel layer, 103-isolation net, 2-ventilation duct, 201-air inlet pipeline, 202-air outlet pipeline, 203-air source, 204-gas chromatograph, 205-second flowmeter, 206-valve, 3-heating device, 301-electric heating controller, 302-high-temperature thermoelectric heating rod, 401-temperature sensor, 402-thermocouple temperature data collector, 403-transceiver acoustic wave transducer, 404-acoustic signal data collector, 405-acoustic signal amplifier, 406-acoustic wave transmitter, 407-acoustic-electrical signal converter, 5-enclosed fire extinguishing device, 501-inert gas source, 502-gas pipeline, 503-fire extinguishing pipeline, 504-first flowmeter, 6-soundproof box. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those within the scope of this description. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0035] Embodiment 1

[0036] This embodiment provides a device for simulating the spontaneous combustion of coal during re-mining in a closed goaf. Figure 1-Figure 3 As shown, it includes a coal-bearing furnace body 1 with a top opening for laying a coal seam 101 and a gravel layer 102, a ventilation duct 2, a heating device 3, a temperature detection device and a closed fire extinguishing device 5. A through hole is opened on one side of the coal-bearing furnace body 1, and an isolation net 103 is installed on the through hole. The ventilation duct 2 is connected with the coal-bearing furnace body 1 through the through hole, and the working ends of the heating device 3, the temperature detection device and the closed fire extinguishing device 5 are all located in the coal seam 101.

[0037] The coal-bearing furnace body 1 is made of high-temperature resistant steel, with an upper opening and no hatch cover. The isolation net 103 is preferably a wire mesh of 2-100 meshes. The coal seam 101 is made of loose coal bodies of different particle sizes, and the thickness of the coal body is adjustable. The loose coal bodies of the particle sizes of 0.9mm-3mm, 3mm-5mm, 5mm-7mm, 7mm-10mm and 0.9mm-10mm mixed particle sizes are preferred. The gravel layer 102 is sandstone of different particle sizes, preferably 0.9mm-3mm, 3mm-5mm, 5mm-7mm, 7mm-10mm and 0.9mm-10mm mixed particle sizes. m, 7mm-10mm and 0.9mm-10mm mixed particle size sandstone, when laying the coal seam 101 and the gravel layer 102, the coal seam 101 is first laid on the bottom of the coal-bearing furnace body 1, and then the gravel layer 102 is laid above the coal seam 101 after leveling; preferably, the coal-bearing furnace body is 80cm long, 60cm wide, and 20cm high, the wire mesh is 80cm long, 20cm high, and 0.2cm thick, so the total thickness of the coal seam 101 and the gravel layer 102 is 20cm; the ventilation duct 2 is made of corrosion-resistant special steel.

[0038] In a more preferred embodiment, a soundproof box 6 is further included, and the coal-bearing furnace body 1 is installed in the soundproof box 6 .

[0039] Preferably, the soundproof box 6 is 90 cm long, 80 cm wide and 20 cm high.

[0040] In a more preferred embodiment, a refractory insulation layer is laid on the outer walls of the plurality of coal-bearing furnace bodies 1. The refractory insulation layer is made of refractory material, preferably high temperature resistant fiber wool.

[0041] In a more preferred embodiment, the ventilation duct 2 includes an air inlet pipeline 201 and an air outlet pipeline 202, an air source 203 is installed at the inlet end of the air inlet pipeline 201, a gas chromatograph 204 is installed at the end of the air outlet pipeline 202, and a second flow meter 205 and a valve 206 are installed on both the air inlet pipeline 201 and the air outlet pipeline 202.

[0042] The gas chromatograph 204 can detect gas components such as carbon monoxide, carbon dioxide, methane, and ethylene in the flue gas.

[0043] Embodiment 2

[0044] Based on Example 1, the closed fire extinguishing device 5 includes an inert gas source 501, a gas pipeline 502 connected to the inert gas source 501, a plurality of fire extinguishing pipelines 503 and a first flow meter 504 installed on the gas pipeline 502. The upper ends of the fire extinguishing pipelines 503 are connected to the gas pipeline 502, and the lower ends are inserted into the coal seam 101.

[0045] Among them, the inert gas source 501 provides nitrogen, the number of fire extinguishing pipelines 503 is preferably 3 or more, which are vertically inserted into the coal-bearing furnace body 1 from top to bottom, and maintain a certain distance from the bottom plate of the coal-bearing furnace body 1, preferably 5 cm, and the fire extinguishing pipeline 503 is preferably installed in the middle of the coal-bearing furnace body 1, that is, between the fire extinguishing pipeline 503 and the isolation net 103, between the fire extinguishing pipeline 503 and the fire extinguishing pipeline 503, and between the fire extinguishing pipeline 503 and the side wall away from the isolation net 103 are installed at equal intervals, and the fire extinguishing pipeline 503 on the front and rear sides of the coal-bearing furnace body 1 are equally spaced, preferably 30 cm.

[0046] In a more preferred embodiment, the fire extinguishing pipeline 503 is uniformly inserted into the coal seam 101 .

[0047] In a more preferred embodiment, the heating device 3 includes an electric heating controller 301 and a high-temperature thermoelectric heating rod 302 which are connected to each other, and the heating end of the high-temperature thermoelectric heating rod 302 is inserted into the coal seam 101 .

[0048] The high temperature thermoelectric heating rod 302 is vertically inserted into the coal-bearing furnace body 1 from top to bottom, and maintains a certain distance from the bottom plate of the coal-bearing furnace body 1, preferably 5 cm. The maximum heating temperature of the high temperature thermoelectric heating rod 302 is not less than 1000°C.

[0049] Embodiment 3

[0050] On the basis of the second embodiment, the temperature detection device includes a plurality of temperature sensors 401 and a thermocouple temperature data collector 402 . The temperature sensors 401 are evenly laid in the coal seam 101 , and the temperature sensors 401 are connected to the thermocouple temperature data collector 402 .

[0051] Among them, the number of temperature sensors 401 is determined according to the size of the coal-bearing furnace body 1, and preferably 6 are set, evenly arranged inside the coal-bearing furnace body 1. The temperature sensor 401 is preferably a temperature point sensor set, which can accommodate multiple-point thermocouple temperature sensors.

[0052] In a more preferred embodiment, the temperature detection device also includes an acoustic non-contact temperature measuring device, which includes a number of transceiver acoustic wave transducers 403 installed on the side walls of the coal-bearing furnace body 1, an acoustic signal data collector 404 and an acoustic signal amplifier 405 connected to the transceiver acoustic wave transducers 403, a sound wave transmitter 406 connected to the sound signal amplifier 405, and an acoustic-to-electrical signal converter 407 connected to both the acoustic signal data collector 404 and the sound wave transmitter 406.

[0053] The number of the transceiver sound wave transducers 403 is determined according to the size of the coal-bearing furnace body 1 , and preferably 6 are set, with 3 evenly set on the front and rear side walls of the coal-bearing furnace body 1 .

[0054] In a more preferred embodiment, the transceiver type acoustic wave transducer 403 is evenly installed on two opposite side walls of the coal-bearing furnace body 1. The two opposite side walls of the coal-bearing furnace body 1 are both adjacent to the side wall with the through hole.

[0055] Embodiment 4

[0056] On the basis of the above embodiments, the test principle of this test device is as follows:

[0057] The crushed and screened coal samples and sandstone are sequentially loaded into the coal-bearing furnace body 1, preferably to a thickness of 10 cm;

[0058] Open all valves 206 to allow air to flow into the coal-bearing furnace body 1 from the air source 203;

[0059] The electric heating controller 301 controls the heating rate of the high-temperature thermoelectric heating rod 302 to heat the coal sample to the ignition point, thus ending the heating;

[0060] During the heating process, the gas chromatograph 204 detects the gas component concentration in the air outlet duct 202, and the temperature sensor 401 detects the temperature of a specific measuring point of the coal sample. The feedback data from the temperature sensor 401 is uploaded to the data processing computer platform via the thermocouple temperature data collector 402 to record the temperature change during the oxidation and spontaneous combustion of the coal sample.

[0061] When the spontaneous combustion of the coal sample develops to the uncontrollable stage, that is, when the temperature of the coal sample reaches 600°C, the valve 206 on the air inlet pipeline 202 is closed, and the inert gas source 501 is operated to deliver inert gas to the coal sample to carry out the fire extinguishing process;

[0062] The gas chromatograph 204 detects the concentration of gas components in the air outlet pipeline 202 during the fire extinguishing process. When the oxygen concentration in the air outlet pipeline 202 is less than or equal to 5%, the inert gas injection is stopped and the valve 206 on the air outlet pipeline 202 is closed;

[0063] After the fire extinguishing process is completed, all valves 206 are opened for ventilation;

[0064] The acoustic wave transmitter 406 is turned on to emit an acoustic wave of a certain frequency, and the acoustic signal amplifier 405 amplifies the acoustic wave signal and transmits it to one of the transceiver acoustic wave transducers 403, which then emit an acoustic wave detection signal. The acoustic wave detection signal is received by the transceiver acoustic wave transducer 403 on the side wall of the coal-bearing furnace body 1 on the opposite side, and is collected by the acoustic signal data collector 404, and converted into an electrical signal by the acoustic-electrical signal converter 407 and transmitted to the data processing computer platform;

[0065] After the other five transceiver acoustic wave transducers 403 send and receive the acoustic wave detection signals in turn, the sending and receiving methods of the acoustic wave detection signals are as follows: Figure 3 As shown, the dotted line in the figure is the transmission and reception route of the acoustic wave detection signal, and the two-dimensional distribution temperature field of the coal sample temperature in the horizontal direction of the layer where the transceiver acoustic wave transducer 403 in the coal-bearing furnace body 1 is located is reconstructed, and the position of the high-temperature area and its formation and evolution process are determined, and the coal spontaneous combustion danger area is determined;

[0066] By changing parameters such as coal body thickness, airflow intensity, air leakage time, and coal body particle size, the experiment was repeated to study the relationship between the environmental factors of the goaf and the formation and evolution of the coal spontaneous combustion hazard area, and the formation and evolution law of the high-temperature area during spontaneous combustion and fire extinguishing after the goaf was closed was obtained.

[0067] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0068] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A test device for simulating spontaneous combustion of coal during re-mining in a closed goaf, characterized in that: The invention comprises a coal-bearing furnace body (1) with an opening at the top for laying a coal seam (101) and a gravel layer (102), and also comprises a ventilation duct (2), a heating device (3), a temperature detection device and a closed fire extinguishing device (5); a through hole is opened on one side of the coal-bearing furnace body (1), an isolation net (103) is installed on the through hole, the ventilation duct (2) is connected to the coal-bearing furnace body (1) through the through hole, and the working ends of the heating device (3), the temperature detection device and the closed fire extinguishing device (5) are all located in the coal seam (101).

2. The device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to claim 1 is characterized in that: The closed fire extinguishing device (5) comprises an inert gas source (501), a gas pipeline (502) connected to the inert gas source (501), a plurality of fire extinguishing pipelines (503) and a first flow meter (504) installed on the gas pipeline (502); the upper ends of the fire extinguishing pipelines (503) are connected to the gas pipeline (502), and the lower ends are inserted into the coal seam (101).

3. The device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to claim 2 is characterized in that: A plurality of fire extinguishing pipelines (503) are uniformly inserted into the coal seam (101).

4. The device for simulating spontaneous combustion of coal during re-mining of a closed goaf according to claim 1, characterized in that: The heating device (3) comprises an electric heating controller (301) and a high-temperature thermoelectric heating rod (302) which are connected to each other, and the heating end of the high-temperature thermoelectric heating rod (302) is inserted into the coal seam (101).

5. The device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to claim 1, characterized in that: The temperature detection device comprises a plurality of temperature sensors (401) and a thermocouple temperature data collector (402); the temperature sensors (401) are evenly laid in the coal seam (101); and the temperature sensors (401) are connected to the thermocouple temperature data collector (402).

6. The device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to claim 1, characterized in that: The temperature detection device also includes an acoustic non-contact temperature measurement device, which includes a plurality of transceiver acoustic wave transducers (403) installed on the side wall of the coal-bearing furnace body (1), an acoustic signal data collector (404) and an acoustic signal amplifier (405) connected to the transceiver acoustic wave transducers (403), a sound wave transmitter (406) connected to the sound signal amplifier (405), and an acoustic-to-electrical signal converter (407) connected to both the sound signal data collector (404) and the sound wave transmitter (406).

7. The device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to claim 6, characterized in that: The transceiver sound wave transducers (403) are evenly mounted on two opposite side walls of the coal-bearing furnace body (1).

8. The device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to claim 1, characterized in that: The ventilation duct (2) comprises an air inlet pipeline (201) and an air outlet pipeline (202); an air source (203) is installed at the inlet end of the air inlet pipeline (201); a gas chromatograph (204) is installed at the end of the air outlet pipeline (202); and a second flow meter (205) and a valve (206) are installed on both the air inlet pipeline (201) and the air outlet pipeline (202).

9. A test device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to any one of claims 1 to 8, characterized in that: The outer wall of the coal-bearing furnace body (1) is provided with a refractory insulation layer.

10. A test device for simulating spontaneous combustion of coal during re-mining in a closed goaf according to any one of claims 1 to 8, characterized in that: It also comprises a soundproof box (6), wherein the coal-bearing furnace body (1) is installed in the soundproof box (6).

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