Simulation experiment system and method for residual coal spontaneous combustion and gas symbiosis disasters in goaf

Abstract

The invention discloses a goaf residual coal spontaneous combustion and gas symbiosis disaster simulation experiment system and method, and belongs to the field of coal mine residual coal spontaneous combustion and gas symbiosis disaster. According to the invention, evolution laws of mass, temperature, pressure, gas components and content in the spontaneous combustion and gas explosion process of the residual coal are explored. The residual coal combustion chamber in the simulation experiment system provided by the invention can be independently used, and is provided with a plurality of interfaces for being connected with monitoring equipment, so that the residual coal combustion process can be independently researched, and the evolution of residual coal spontaneous combustion and gas symbiosis disasters in a goaf can be comprehensively researched; and a necessary basis is provided for prevention and control of residual coal spontaneous combustion and gas symbiosis disasters in the mine goaf while the experiment cost is reduced.

Description

Technical Field

[0001] The invention relates to a simulation experiment system and method for spontaneous combustion of coal residue and gas symbiosis disaster in goaf areas, belonging to the field of spontaneous combustion of coal residue and gas symbiosis disaster in coal mines. Background Art

[0002] With the depletion of shallow coal resources, deeper mining is creating a complex mechanical environment characterized by "three highs and one disturbance." More and more mines are facing the threat of spontaneous combustion of coal and gas co-existence. High-pressure extraction lanes and gas tail lanes used for gas extraction can fracture the overlying rock mass. The extraction process traverses large goafs, increasing air leakage and expanding the risk zone for spontaneous combustion of coal within the goaf. Simultaneously, spontaneous combustion of coal provides a ignition source for gas explosions. The combined effects of these two factors pose a serious threat to mine safety and the lives of the people. Therefore, it is necessary to clarify the evolution of the spontaneous combustion of coal within goafs and the co-existence of gas.

[0003] Numerous simulation experimental devices have been developed to investigate the process and mechanism of spontaneous combustion of coal and gas co-existence in goafs. However, these devices are all rectangular, pressure-resistant, and explosion-proof (e.g., Chinese Patent CN112415052A). These devices are prone to localized stress concentrations and, if they fail during an explosion, can shatter and produce fragments, posing a high risk. Analysis of the composition and content of gases generated during experiments typically uses gas chromatographs (e.g., Chinese Patents CN106770897A, CN110006947A, and CN117368414A), which lack real-time, multi-component gas analysis and incur high maintenance costs. Furthermore, these devices lack the ability to replay the experimental process, failing to capture critical changes in spontaneous combustion of coal and gas co-existence. Furthermore, the gas composition and content fluctuate constantly during the experiment, resulting in a low-representation gas sample.

[0004] In summary, providing a more systematic, comprehensive and safer simulation experimental system and method for spontaneous combustion of coal and gas co-existence disasters in goafs is of great significance for further clarifying the disaster-causing process and mechanism of spontaneous combustion of coal and gas co-existence disasters in goafs. Summary of the Invention

[0005] In response to the above-mentioned deficiencies in the existing technology, the present invention provides a simulation experimental system and method for spontaneous combustion of coal and gas symbiosis disasters in goaf areas, which explores the evolution laws of mass, temperature, pressure, gas components and content during spontaneous combustion of coal and gas explosion, and provides the necessary basis for the prevention and control of spontaneous combustion of coal and gas symbiosis disasters in mine goaf areas.

[0006] The experimental system provided by the present invention can not only simulate the spontaneous combustion process of coal residue in goaf alone, but also comprehensively study the evolution of spontaneous combustion of coal residue in goaf and gas symbiosis disasters.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows: The present invention provides a goaf coal spontaneous combustion simulation experimental system, comprising a computer control device, a coal combustion chamber, an infrared thermal imaging device, a camera device, an exhaust gas treatment device, a Fourier smoke toxicity analysis device, a fire extinguishing gas cylinder and an air gas cylinder; The computer control device is mainly composed of a control cabinet and a display, wherein the control cabinet can be connected to the coal combustion chamber through a cable. The control cabinet has a built-in temperature and humidity controller for controlling the temperature, humidity and switch status of the coal combustion chamber, and can record the temperature, humidity and pressure data in the coal combustion chamber in real time.

[0008] The coal combustion chamber includes an observation window A, a fully automatic electronic scale, a circulation fan, a smoke exhaust fan, a shut-off valve, a temperature sensor A and a pressure sensor A; the observation window A is made of high-temperature resistant glass and is located in the center of the coal combustion chamber; the fully automatic electronic scale is located at the center position of the bottom end of the observation window A, and its data is recorded in real time by a computer control device; the coal is laid directly above the fully automatic electronic scale; the circulation fan is fixed to the center position of the inner wall of the coal combustion chamber by bolts; a shut-off valve and a smoke exhaust fan are provided at the top of the coal combustion chamber, and the discharge of smoke is controlled by the shut-off valve. The top of the smoke exhaust fan is provided with a first interface adapted to the exhaust gas treatment device, which can be connected to the exhaust gas treatment device to timely process the discharged smoke; the data of the temperature sensor A and the pressure sensor A are recorded in real time by the computer control device; at the same time, the coal combustion chamber body is provided with a second interface, a third interface and a fourth interface, which can be connected to the Fourier smoke toxicity analysis device, an air cylinder and a fire extinguishing cylinder respectively.

[0009] The infrared thermal imaging device and the camera device are both independent devices that can record and save experimental images and videos in real time. When used to monitor the spontaneous combustion process of coal residue in the goaf, both are placed directly in front of the observation window A; the exhaust gas treatment device can promptly post-process the flue gas / gas generated during the experiment; the Fourier smoke toxicity analysis device is a fully automatic continuous measurement device that can continuously test and store the components and content of flue gas / gas for a long time, and can also play back historical data.

[0010] The fire extinguishing gas cylinder is connected to the fourth interface of the residual coal combustion chamber through a pipeline, and a flow control valve B and a stop valve B are provided on the pipeline. The flow control valve B is used to adjust the fire extinguishing rate, and the stop valve B is used to control the fire extinguishing time of the residual coal combustion chamber; the air cylinder is connected to the third interface of the residual coal combustion chamber through a pipeline, and a flow control valve D and a stop valve D are provided on the pipeline. The flow control valve D is used to adjust the air rate entering the residual coal combustion chamber from the air cylinder, and the stop valve D is used to control the on-off status of the air in the residual coal combustion chamber.

[0011] The present invention provides a method for simulating spontaneous combustion of coal in goaf, comprising the following steps: S1: Connect the Fourier smoke toxicity analysis device, air cylinder and fire extinguishing cylinder to the coal combustion chamber through the second interface, third interface and fourth interface respectively, connect the smoke exhaust fan and exhaust gas treatment device through the first interface, and check whether the contact of each cable is good and the air tightness of the device. At the same time, place the infrared thermal imaging device and camera device directly in front of the observation window A.

[0012] S2: Weigh the residual coal according to the set mass and place it on the fully automatic electronic scale in the residual coal combustion chamber; S3: Open the stop valve D and adjust the rate of air entering the coal combustion chamber through the flow control valve D. When the set pressure is reached, close the stop valve D; S4: The humidity, temperature rise range and temperature rise rate in the coal combustion chamber are set by the computer control device, and the infrared thermal imaging device and the camera device are turned on to capture experimental images and videos in real time; S5: Observe the temperature and pressure values ​​in the coal combustion chamber displayed on the computer control device. When the temperature and pressure rise sharply, the coal begins to spontaneously combust. Stop heating and start the Fourier smoke toxicity analysis device. When the temperature and pressure tend to stabilize, the coal spontaneous combustion ends. Open the stop valve B and extinguish the open flame with the fire extinguishing gas cylinder. S6: Open the shut-off valve to discharge excess flue gas through the exhaust fan, and use the exhaust gas treatment device to post-treat the flue gas; S7: Export the temperature and pressure data and the coal quality change data from the computer control device, export the relevant data from the infrared thermal imaging device, the camera device and the Fourier smoke toxicity analysis device, and close each experimental device, and the experiment ends.

[0013] The present invention provides a simulation experimental system for spontaneous combustion of coal residue and gas co-existence disaster in goaf, which includes a computer control device, a coal residue combustion chamber, a mixed explosion kettle, an infrared thermal imaging device, a camera device, an exhaust gas treatment device, a Fourier smoke toxicity analysis device, a fire extinguishing gas cylinder, an air gas cylinder and a gas gas cylinder.

[0014] The computer control device consists of a control cabinet and a display, wherein the control cabinet can be connected to the residual coal combustion chamber and the mixed explosion kettle through cables. The control cabinet has a built-in temperature and humidity controller for controlling the temperature, humidity and switch status of the residual coal combustion chamber and the mixed explosion kettle, and can record the temperature, humidity and pressure data in the residual coal combustion chamber and the mixed explosion kettle in real time.

[0015] The coal combustion chamber includes an observation window A, a fully automatic electronic scale, coal, a circulation fan, a smoke exhaust fan, a shut-off valve, a temperature sensor A and a pressure sensor A; the observation window A is made of high-temperature resistant glass and is located in the center of the coal combustion chamber; the fully automatic electronic scale is located at the center position of the bottom end of the observation window A, and its data is recorded in real time by a computer control device; the coal is laid directly above the fully automatic electronic scale; the circulation fan is fixed to the center position of the inner wall of the coal combustion chamber by bolts; a shut-off valve and a smoke exhaust fan are provided at the top of the coal combustion chamber, and the discharge of smoke is controlled by the shut-off valve. The top of the smoke exhaust fan is provided with a first interface adapted to the exhaust gas treatment device, which can be connected to the exhaust gas treatment device to promptly process the discharged smoke; the data of the temperature sensor A and the pressure sensor A are recorded in real time by the computer control device; at the same time, the coal combustion chamber body is provided with a second interface, a third interface and a fourth interface, which can be connected to the Fourier smoke toxicity analysis device, an air cylinder and a fire extinguishing cylinder respectively.

[0016] The mixed explosion kettle includes a temperature sensor B, a pressure sensor B, a vacuum device, a magnetic stirrer, an observation window B, an infrared thermal imaging window and a camera window; the mixed explosion kettle is connected to the residual coal combustion chamber through a high-temperature resistant air duct; the infrared thermal imaging window and the camera window are respectively adapted to the lenses of the infrared thermal imaging device and the camera device, and can directly take photos or videos to record the experimental process in real time; the outside of the mixed explosion kettle is provided with a fifth interface, a sixth interface, a seventh interface, an eighth interface and a ninth interface, which can be respectively connected to the exhaust treatment device, the Fourier smoke toxicity analysis device, the air cylinder, the fire extinguishing cylinder and the gas cylinder.

[0017] The temperature and humidity in the mixed explosion kettle can be directly coupled with the temperature and humidity in the residual coal combustion chamber, and can also be controlled separately by a computer control device; the temperature sensor B and the pressure sensor B can respectively monitor the temperature and pressure in the mixed explosion kettle in real time, and are recorded by the computer control device; the magnetic stirrer is located at the bottom of the mixed explosion kettle; the observation window B is located in the center of the mixed explosion kettle; the high-temperature resistant air duct is provided with a flow control valve A and a shut-off valve A, and the flow control valve A is used to adjust the amount of flue gas entering the mixed explosion kettle from the residual coal combustion chamber, and the shut-off valve A is used to control the on and off of the flue gas.

[0018] The infrared thermal imaging device and the camera device are both independent devices that can record and save experimental images and videos in real time. When used to monitor the spontaneous combustion of coal residue and gas symbiosis disaster process in the goaf, the lenses of the infrared thermal imaging device and the camera device are first placed directly in front of the observation window A, and then placed on the infrared thermal imaging window and the camera window on the mixed explosion kettle respectively; the exhaust gas treatment device is connected to the smoke exhaust fan and the mixed explosion kettle through the first interface and the fifth interface respectively, and can timely post-process the flue gas / gas generated in the coal residue combustion chamber and the mixed explosion kettle during the experiment; the Fourier smoke toxicity analysis device is a fully automatic continuous measuring device that can continuously test and store the components and content of flue gas / gas for a long time, and can also play back historical data. When monitoring the spontaneous combustion of coal residue and gas symbiosis disaster process in the goaf, the Fourier smoke toxicity analysis device is first connected to the coal residue combustion chamber by a cable through the second interface, and then connected to the mixed explosion kettle by a cable through the sixth interface.

[0019] The fire extinguishing gas cylinder adjusts the fire extinguishing rate through the flow control valve B, and controls the fire extinguishing time of the residual coal combustion chamber and the mixed explosion kettle through the stop valve B and the stop valve F respectively; the gas cylinder adjusts the gas rate entering the mixed explosion kettle through the flow control valve C, and controls the gas on and off through the stop valve C; the air cylinder adjusts the air rate entering the residual coal combustion chamber or the mixed explosion kettle from the air cylinder through the flow control valve D, and controls the air on and off in the residual coal combustion chamber and the mixed explosion kettle respectively through the stop valve D and the stop valve E.

[0020] The computer control system used in the present invention adopts the +Labview program, which can automatically control the heating rate, and the heating rate is 2°C~10°C / min. It is connected to the coal combustion chamber and the mixed explosion kettle through cables, and can control the temperature, humidity and switch status of each system, and has the function of real-time data recording and analysis.

[0021] The mixed explosion kettle is a spherical high-pressure container made of SUS#316 stainless steel, with an inner diameter of 700mm and an internal volume of approximately 1000L. It can withstand a maximum pressure of ≥3MPa and a constant pressure of ≥2.5MPa. The vacuum pump of the vacuum device has a pumping rate of ≥10L / s and reaches a vacuum degree of ≤1.0kPa. The magnetic stirrer is made of insulating and high-temperature resistant material. The observation window B is made of high-pressure resistant glass.

[0022] The Fourier smoke toxicity analysis device uses mid-infrared full spectrum analysis with a spectral range of 500~4500cm -1 , can measure more than 50 gas components simultaneously and has a database of more than 400 reference gases.

[0023] The present invention provides a method for simulating spontaneous combustion of coal and gas co-existence disasters in goaf, comprising the following steps: S1: Connect the Fourier smoke toxicity analysis device to the coal combustion chamber through the second interface, connect the air cylinder to the coal combustion chamber and the mixed explosion kettle through the third interface and the seventh interface respectively, connect the fire extinguishing cylinder to the coal combustion chamber and the mixed explosion kettle through the fourth interface and the eighth interface respectively, connect the exhaust gas treatment device to the smoke exhaust fan and the mixed explosion kettle through the first interface and the fifth interface respectively, and check whether the contact of each cable is good and the air tightness of the device, at the same time, place the infrared thermal imaging device and the camera device in front of the observation window A, and connect the gas cylinder to the mixed explosion kettle through the ninth interface; S2: Weigh the residual coal according to the set mass and place it on the fully automatic electronic scale in the residual coal combustion chamber; S3: Open the stop valve D and adjust the rate of air entering the coal combustion chamber through the flow control valve D. When the set pressure is reached, close the stop valve D; S4: Open the vacuum pumping device to evacuate the mixed explosion kettle, then close the vacuum pumping device and open the stop valve C and stop valve E. Use the flow control valve C and flow control valve D to control the ratio of gas and air respectively. After reaching the set pressure, close the stop valve C and stop valve E. S5: The humidity, temperature rise range and temperature rise rate of the residual coal combustion chamber are set by the computer control device, and coupled with the temperature and humidity in the mixed explosion kettle. The infrared thermal imaging device and the camera device are turned on to capture experimental images and videos in real time; S6: Observe the temperature and pressure values ​​in the coal combustion chamber displayed on the computer control device. When the temperature and pressure rise sharply, the coal begins to spontaneously combust. Stop heating the coal combustion chamber and start the Fourier smoke toxicity analysis device. When the temperature and pressure tend to stabilize, the coal spontaneous combustion ends, and open the stop valve B to extinguish the open flame with the fire extinguishing gas cylinder. S7: Remove the Fourier smoke toxicity analysis device from the residual coal combustion chamber and connect it to the mixed explosion kettle through the sixth interface, and place the infrared thermal imaging device and the camera lens on the infrared thermal imaging window and the camera window of the mixed explosion kettle respectively; S8: Continue heating the mixed explosion kettle at the heating rate in S5, and open the stop valve A on the high-temperature resistant gas channel. Control the amount of flue gas entering the mixed explosion kettle from the residual coal combustion chamber through the flow control valve A. Simultaneously, turn on the infrared thermal imaging device, the camera device, and the Fourier smoke toxicity analysis device. When a violent sound is heard, an explosion occurs in the mixed explosion kettle. Stop heating, close the stop valve A, and open the stop valve F to extinguish the open flame using the fire extinguishing gas cylinder. S9: Use tail gas treatment device to post-treat the gas in the mixed explosion kettle and the residual flue gas in the residual coal combustion chamber; S10: Export the temperature and pressure data and the coal quality change data from the computer control device, export the relevant data from the infrared thermal imaging device, the camera device and the Fourier smoke toxicity analysis device, and close each experimental device, and the experiment ends.

[0024] Beneficial effects of the present invention: (1) In the simulation experimental system provided by the present invention, the coal combustion chamber can be used independently and is equipped with multiple interfaces for connecting monitoring equipment, which can independently study the coal combustion process and reduce experimental costs. At the same time, the smoke exhaust fan on the coal combustion chamber can exhaust the excess smoke generated by the coal combustion. In combination with the mixed explosion kettle, the danger of spontaneous combustion of coal in the goaf and gas co-existence disasters under different smoke concentrations can be explored.

[0025] (2) In the simulation experimental system provided by the present invention, the fully automatic electronic scale can record the mass changes during the combustion of the residual coal in real time; the infrared thermal imaging device can display the diffusion of heat in real time; the camera device can record the entire experimental process for easy playback and data recording; and the fire extinguishing gas cylinder can improve the safety of the experiment.

[0026] (3) The Fourier smoke toxicity analysis device used in the simulation experimental system provided by the present invention has high sensitivity, can dynamically track the concentration changes of various components in the gas / smoke, and the analysis values ​​are accurate; it can be directly connected to the smoke / gas sampling device without the need for complex pre-processing work, and a single scan can simultaneously detect multiple gases, and the long-term use cost is low.

[0027] (4) The provision of a circulating fan and a magnetic stirrer in the simulation experimental system provided by the present invention can promote a uniform temperature and humidity environment in the residual coal combustion chamber and the mixed explosion kettle, and can also fully mix the generated gases, making the samples selected for analyzing the gas components and content more representative, thereby reducing experimental errors.

[0028] (5) The spherical design of the mixed explosion kettle in the simulation experimental system provided by the present invention can avoid local stress concentration, increase its high-pressure resistance, and ensure safety; less material is required for the sphere under the same volume, which can effectively reduce weight and cost; at the same time, if the mixed explosion kettle fails, the sphere is more likely to deform as a whole rather than break, reducing high-speed flying fragments and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of a goaf coal spontaneous combustion simulation experimental system according to Example 1 of the present invention; Figure 2 This is a schematic structural diagram of a simulated experimental system for spontaneous combustion of coal and gas co-existence disasters in goafs according to Example 2 of the present invention; In the figure: 1-computer control device, 2-residual coal combustion chamber, 3-mixing explosion kettle, 4-infrared thermal imaging device, 5-camera device, 6-exhaust gas treatment device, 7-Fourier smoke toxicity analysis device, 8-fire extinguishing gas cylinder, 9-control cabinet, 10-display, 11-observation window A, 12-full-automatic electronic scale, 13-residual coal, 14-circulation fan, 15-smoke exhaust fan, 16-blocking valve, 17-temperature sensor A, 18-pressure sensor A, 19-first interface, 20-second interface, 21-third interface, 22-fourth interface, 23-air cylinder, 24-temperature sensor B, 25-pressure sensor B, 26-vacuum device, 27-magnetic stirrer, 28-observation window B, 29-infrared thermal imaging window, 30-camera window, 31-high-temperature resistant gas duct, 32-fifth interface, 33-sixth interface, 34-seventh interface, 35-eighth interface, 36-ninth interface, 37-gas cylinder, 38-flow control valve A, 39-stop valve A, 40-flow control valve B, 41-stop valve B, 42-flow control valve C, 43-stop valve C, 44-flow control valve D, 45-stop valve D, 46-stop valve E, 47-stop valve F. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "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 limiting the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] The present invention is further illustrated below by way of examples, but is not limited to the following examples. Example 1

[0034] This embodiment provides a goaf coal spontaneous combustion simulation experimental system. Figure 1 As shown, it includes a computer control device 1, a coal combustion chamber 2, an infrared thermal imaging device 4, a camera device 5, an exhaust gas treatment device 6, a Fourier smoke toxicity analysis device 7, a fire extinguishing gas cylinder 8 and an air cylinder 23; The computer control device 1 is mainly composed of a control cabinet 9 and a display 10, wherein the control cabinet 9 can be connected to the coal combustion chamber 2 through a cable. The control cabinet 9 is equipped with a built-in temperature and humidity controller for controlling the temperature, humidity and switch status of the coal combustion chamber 2, and can record the temperature, humidity and pressure data in the coal combustion chamber 2 in real time.

[0035] The coal combustion chamber 2 includes an observation window A11, an automatic electronic scale 12, a circulation fan 14, an exhaust fan 15, a shut-off valve 16, a temperature sensor A17 and a pressure sensor A18; the observation window A11 is made of high-temperature resistant glass and is located in the center of the coal combustion chamber 2; the automatic electronic scale 12 is located at the center of the bottom of the observation window A11, and its data is recorded in real time by the computer control device 1; the coal 13 is laid directly above the automatic electronic scale 12; the circulation fan 14 is fixed to the center of the inner wall of the coal combustion chamber 2 by bolts; the coal combustion chamber 2 is equipped with a plurality of air conditioners, and the air conditioner 10 is connected to the combustion chamber 2 through a plurality of air conditioners. A shut-off valve 16 and a smoke exhaust fan 15 are provided on the top of the combustion chamber 2. The discharge of smoke is controlled by the shut-off valve 16. A first interface 19 adapted to the exhaust gas treatment device 6 is provided on the top of the smoke exhaust fan 15, which can be connected to the exhaust gas treatment device 6 to promptly process the discharged smoke; the data of the temperature sensor A17 and the pressure sensor A18 are recorded in real time by the computer control device 1; at the same time, the cavity body of the residual coal combustion chamber 2 is provided with a second interface 20, a third interface 21 and a fourth interface 22, which can be connected to the Fourier smoke toxicity analysis device 7, the air cylinder 23 and the fire extinguishing cylinder 8 respectively.

[0036] The infrared thermal imaging device 4 and the camera device 5 are both independent devices that can record and save experimental images and videos in real time. When used to monitor the spontaneous combustion process of coal residue in the goaf, the two are placed directly in front of the observation window A11; the exhaust gas treatment device 6 can promptly post-process the flue gas / gas generated during the experiment; the Fourier smoke toxicity analysis device 7 is a fully automatic continuous measurement device that can continuously test and store the components and content of flue gas / gas for a long time, and can also play back historical data.

[0037] The computer control system 1 used in this embodiment adopts the +Labview program, which can automatically control the heating rate, and the heating rate is 2℃~10℃ / min. It is connected to the coal combustion chamber 2 through a cable, and can control the temperature, humidity and switch status of each system, and has the function of real-time data recording and analysis.

[0038] The Fourier smoke toxicity analysis device 7 uses mid-infrared full spectrum analysis with a spectral range of 500~4500cm -1 , can measure more than 50 gas components simultaneously and has a database of more than 400 reference gases.

[0039] The fire extinguishing gas cylinder 8 is connected to the fourth interface 22 of the residual coal combustion chamber 2 through a pipeline, and a flow control valve B40 and a stop valve B41 are provided on the pipeline; the air gas cylinder 23 is connected to the third interface 21 of the residual coal combustion chamber 2 through a pipeline, and a flow control valve D44 and a stop valve D45 are provided on the pipeline; the fire extinguishing gas cylinder 8 adjusts the fire extinguishing rate through the flow control valve B40, and controls the fire extinguishing time of the residual coal combustion chamber 2 through the stop valve B41; the air gas cylinder 23 adjusts the air rate entering the residual coal combustion chamber 2 from the air gas cylinder by the flow control valve D44, and controls the on-off status of the air in the residual coal combustion chamber through the stop valve D45.

[0040] The method for simulating spontaneous combustion of coal in goaf using the above-mentioned device includes the following steps: S1: Connect the Fourier smoke toxicity analysis device 7, the air cylinder 23 and the fire extinguishing cylinder 8 to the coal combustion chamber 2 through the second interface 20, the third interface 21 and the fourth interface 22 respectively, connect the smoke exhaust fan 15 and the exhaust gas treatment device 6 through the first interface 19, and check whether the contact of each cable is good and the air tightness of the device, and at the same time place the infrared thermal imaging device 4 and the camera device 5 directly in front of the observation window A11.

[0041] S2: Weigh about 5 kg of residual coal 13 and place it on the automatic electronic scale 12 of the residual coal combustion chamber 2; S3: Open the stop valve D45 and adjust the air flow rate into the coal combustion chamber 2 to 0.1 kPa / s through the flow control valve D44. After the set pressure reaches 110 kPa, close the stop valve D45. S4: The computer control device 1 is used to set the humidity in the coal combustion chamber 2 to 85%, the temperature rise range to 0-500°C, and the temperature rise rate to 2°C / min. The infrared thermal imaging device 4 and the camera device 5 are turned on to capture experimental images and videos in real time. S5: Observe the temperature and pressure values ​​in the coal combustion chamber 2 displayed on the computer control device 1. When the temperature and pressure rise sharply, the coal 13 begins to spontaneously combust. Stop heating and start the Fourier smoke toxicity analyzer 7. When the temperature and pressure tend to stabilize, the spontaneous combustion of the coal 13 ends. Open the stop valve B41 and extinguish the open flame with the fire extinguishing gas cylinder 8. S6: Open the shut-off valve 16 to discharge the excess flue gas through the exhaust fan 15, and use the exhaust gas treatment device 6 to post-treat the flue gas; S7: Export the temperature and pressure data and the mass change data of the coal residue 13 from the computer control device 1, export the relevant data from the infrared thermal imaging device 4, the camera device 5 and the Fourier smoke toxicity analysis device 7, and close each experimental device, and the experiment ends.

[0042] In the simulation experiment system provided in this embodiment, the coal combustion chamber is used separately and is provided with multiple interfaces for connecting monitoring equipment, which is used to independently study the process of coal combustion and reduce experimental costs; the fully automatic electronic scale can record the mass changes during the combustion of coal in real time; the infrared thermal imaging device can display the diffusion of heat in real time; the camera device can record the entire experimental process for easy playback and data recording; the fire extinguishing gas cylinder can improve the safety of the experiment; the Fourier smoke toxicity analysis device used in the simulation experiment system has high sensitivity, can dynamically track the concentration changes of various components in the gas / smoke, and the analysis values ​​are accurate; it can be directly connected to the flue gas / gas sampling device without the need for complicated pre-processing work, and a single scan can detect multiple gases at the same time, and the long-term use cost is low. Example 2

[0043] This embodiment provides a simulation experiment system for spontaneous combustion of coal and gas co-existence disaster in goaf. Figure 2 As shown, it includes a computer control device 1, a residual coal combustion chamber 2, a mixed explosion kettle 3, an infrared thermal imaging device 4, a camera device 5, an exhaust gas treatment device 6, a Fourier smoke toxicity analysis device 7, a fire extinguishing gas cylinder 8, an air cylinder 23 and a gas cylinder 37; The computer control device 1 is mainly composed of a control cabinet 9 and a display 10, wherein the control cabinet 9 can be connected to the residual coal combustion chamber 2 and the mixed explosion kettle 3 through cables. The control cabinet 9 is equipped with a built-in temperature and humidity controller for controlling the temperature, humidity and switch status of the residual coal combustion chamber 2 and the mixed explosion kettle 3, and can record the temperature, humidity and pressure data in the residual coal combustion chamber 2 and the mixed explosion kettle 3 in real time.

[0044] The coal combustion chamber 2 includes an observation window A11, an automatic electronic scale 12, a circulation fan 14, an exhaust fan 15, a shut-off valve 16, a temperature sensor A17 and a pressure sensor A18; the observation window A11 is made of high-temperature resistant glass and is located in the center of the coal combustion chamber 2; the automatic electronic scale 12 is located at the center of the bottom of the observation window A11, and its data is recorded in real time by the computer control device 1; the coal 13 is laid directly above the automatic electronic scale 12; the circulation fan 14 is fixed to the center of the inner wall of the coal combustion chamber 2 by bolts; the coal combustion chamber 2 is equipped with a plurality of air conditioners, and the air conditioner 10 is connected to the combustion chamber 2 through a plurality of air conditioners. A shut-off valve 16 and a smoke exhaust fan 15 are provided on the top of the combustion chamber 2, and the discharge of smoke is controlled by the shut-off valve 16. A first interface 19 adapted to the exhaust gas treatment device 6 is provided on the top of the smoke exhaust fan 15, which can be connected to the exhaust gas treatment device 6 to promptly treat the discharged smoke; the data of the temperature sensor A17 and the pressure sensor A18 are recorded in real time by the computer control device 1; at the same time, the cavity body of the residual coal combustion chamber 2 is provided with a second interface 20, a third interface 21 and a fourth interface 22, which can be connected to the Fourier smoke toxicity analysis device 7, the air cylinder 23 and the fire extinguishing cylinder 8 respectively.

[0045] The mixed explosion kettle 3 includes a temperature sensor B24, a pressure sensor B25, a vacuum device 26, a magnetic stirrer 27, an observation window B28, an infrared thermal imaging window 29 and a camera window 30; the mixed explosion kettle 3 is connected to the coal combustion chamber 2 through a high-temperature resistant air duct 31; the infrared thermal imaging window 29 and the camera window 30 are respectively adapted to the lenses of the infrared thermal imaging device 4 and the camera device 5, and can directly take pictures or videos to record the experimental process in real time; the outside of the mixed explosion kettle 3 is provided with a fifth interface 32, a sixth interface 33, a seventh interface 34, an eighth interface 35 and a ninth interface 36, which can be respectively connected to the exhaust treatment device 6, the Fourier smoke toxicity analysis device 7, the air cylinder 23, the fire extinguishing cylinder 8 and the gas cylinder 37.

[0046] The temperature and humidity in the mixed explosion kettle 3 can be directly coupled with the temperature and humidity in the residual coal combustion chamber 2, and can also be controlled separately by the computer control device 1; the temperature sensor B24 and the pressure sensor B25 can respectively monitor the temperature and pressure in the mixed explosion kettle 3 in real time, and be recorded by the computer control device 1; the magnetic stirrer 27 is located at the bottom of the mixed explosion kettle 3; the observation window B28 is located in the center of the mixed explosion kettle 3; the high-temperature resistant air duct 31 is provided with a flow control valve A38 and a stop valve A39, and the flow control valve A38 is used to adjust the amount of flue gas entering the mixed explosion kettle 3 from the residual coal combustion chamber 2, and the stop valve A39 is used to control the on and off of the flue gas.

[0047] The infrared thermal imaging device 4 and the camera device 5 are both independent devices, which can record and save experimental images and videos in real time. When used to monitor the spontaneous combustion of coal residue and gas symbiosis disaster process in the goaf, the lenses of the infrared thermal imaging device 4 and the camera device 5 are first placed in front of the observation window A11, and then placed on the infrared thermal imaging window 29 and the camera window 30 on the mixed explosion kettle 3 respectively; the exhaust gas treatment device 6 is connected to the smoke exhaust fan 15 and the mixed explosion kettle 3 at the same time through the first interface 19 and the fifth interface 32 respectively, and can timely post-process the flue gas / gas generated in the coal residue combustion chamber 2 and the mixed explosion kettle 3 during the experiment; the Fourier smoke toxicity analysis device 7 is a fully automatic continuous measuring device, which can continuously test and store the components and content of flue gas / gas for a long time, and can also play back historical data. When monitoring the spontaneous combustion of coal residue and gas symbiosis disaster process in the goaf, the Fourier smoke toxicity analysis device 7 is first connected to the coal residue combustion chamber 2 by a cable through the second interface 20, and then connected to the mixed explosion kettle 3 by a cable through the sixth interface 33.

[0048] The computer control system 1 used in this embodiment adopts the +Labview program, which can automatically control the heating rate, and the heating rate is 2℃~10℃ / min. It is connected to the coal combustion chamber 2 and the mixed explosion kettle 3 through cables, and can control the temperature, humidity and switch status of each system, and has the function of real-time data recording and analysis.

[0049] The mixed explosion kettle 3 is a spherical high-pressure resistant container made of SUS#316 stainless steel, with an inner diameter of 700mm and an internal volume of approximately 1000L. The maximum pressure it can withstand is ≥3MPa and the constant pressure it can withstand is ≥2.5MPa. The vacuum pump of the vacuum device 26 has a vacuuming rate of ≥10L / s and reaches a vacuum degree of ≤1.0kPa. The magnetic stirrer 27 is made of insulating and high-temperature resistant material. The observation window B28 is made of high-pressure resistant glass.

[0050] The Fourier smoke toxicity analysis device 7 uses mid-infrared full spectrum analysis with a spectral range of 500~4500cm -1 , can measure more than 50 gas components simultaneously and has a database of more than 400 reference gases.

[0051] The fire extinguishing gas cylinder 8 adjusts the fire extinguishing rate through the flow control valve B40, and controls the fire extinguishing time of the residual coal combustion chamber 2 and the mixed explosion kettle 3 through the stop valve B41 and the stop valve F47 respectively; the gas cylinder 37 adjusts the gas rate entering the mixed explosion kettle 3 through the flow control valve C42, and controls the gas on and off through the stop valve C43; the air cylinder 23 adjusts the air rate entering the residual coal combustion chamber 2 or the mixed explosion kettle 3 from the air cylinder 23 through the flow control valve D44, and controls the on and off of the air in the residual coal combustion chamber 2 and the mixed explosion kettle 3 respectively through the stop valve D45 and the stop valve E46.

[0052] The present invention provides a method for conducting a simulation experiment on the spontaneous combustion of coal in goaf and gas co-existence disaster using the above system. The method can simulate the spontaneous combustion process of coal in goaf alone (as shown in Example 1), or can comprehensively study the evolution of the spontaneous combustion of coal in goaf and gas co-existence disaster (this example). A method for simulating spontaneous combustion of coal and gas co-existence disasters in goafs, comprising the following steps: S1: Connect the Fourier smoke toxicity analysis device 7 to the coal combustion chamber 2 through the second interface 20, connect the air cylinder 23 to the coal combustion chamber 2 and the mixed explosion kettle 3 through the third interface 21 and the seventh interface 34 respectively, connect the fire extinguishing cylinder 8 to the coal combustion chamber 2 and the mixed explosion kettle 3 through the fourth interface 22 and the eighth interface 35 respectively, connect the exhaust gas treatment device 6 to the smoke exhaust fan 15 and the mixed explosion kettle 3 through the first interface 19 and the fifth interface 32 respectively, and check whether the contact of each cable is good and the air tightness of the device, at the same time, place the infrared thermal imaging device 4 and the camera device 5 right in front of the observation window A11, and connect the gas cylinder 37 to the mixed explosion kettle 3 through the ninth interface 36; S2: Weigh about 5 kg of residual coal 13 and place it on the automatic electronic scale 12 of the residual coal combustion chamber 2; S3: Open the stop valve D45 and adjust the air flow rate into the coal combustion chamber 2 to 0.1 kPa / s through the flow control valve D44. After the set pressure reaches 110 kPa, close the stop valve D45. S4: Open the vacuum pumping device 26 to evacuate the mixed explosion kettle 3, then close the vacuum pumping device 26 and open the stop valve C43 and the stop valve E46. Use the flow control valve C42 and the flow control valve D44 to control the ratio of gas to air to 2:8 respectively. After reaching the set pressure of 150 kPa, close the stop valve C43 and the stop valve E46. S5: The computer control device 1 is used to set the humidity of the coal combustion chamber 2 to 85%, the temperature rise range to 0-500°C, and the temperature rise rate to 2°C / min. The computer control device 1 is coupled with the temperature and humidity in the mixed explosion kettle 3. The infrared thermal imaging device 4 and the camera device 5 are turned on to capture experimental images and videos in real time. S6: Observe the temperature and pressure values ​​in the coal combustion chamber 2 displayed on the computer control device 1. When the temperature and pressure rise sharply, the coal 13 begins to spontaneously combust. Stop heating the coal combustion chamber 2 and start the Fourier smoke toxicity analysis device 7. When the temperature and pressure tend to stabilize, the spontaneous combustion of the coal 13 ends, and open the stop valve B41 to extinguish the open flame through the fire extinguishing gas cylinder 8. S7: Remove the Fourier smoke toxicity analysis device 7 from the coal combustion chamber 2 and connect it to the mixed explosion kettle 3 via the sixth interface 33. Place the infrared thermal imaging device 4 and the camera lens 5 on the infrared thermal imaging window 29 and the camera lens 30 of the mixed explosion kettle 3 respectively. S8: Continue heating the mixed explosion kettle 3 at a heating rate of 2°C / min, and open the stop valve A39 on the high-temperature resistant gas channel 31. Control the amount of flue gas entering the mixed explosion kettle 3 from the residual coal combustion chamber 2 through the flow control valve A38. Simultaneously, turn on the infrared thermal imaging device 4, the camera device 5, and the Fourier smoke toxicity analysis device 7. When a violent sound is heard, an explosion occurs in the mixed explosion kettle 3. Stop heating, close the stop valve A39, open the stop valve F47, and extinguish the open flame with the fire extinguishing gas cylinder 8. S9: using the tail gas treatment device 6 to post-treat the gas in the mixed explosion kettle 3 and the remaining flue gas in the residual coal combustion chamber 2; S10: The temperature and pressure data and the mass change data of the coal residue 13 are exported from the computer control device 1, and the relevant data are exported from the infrared thermal imaging device 4, the camera device 5 and the Fourier smoke toxicity analysis device 7, and each experimental device is closed, and the experiment ends.

[0053] This embodiment adds a mixed explosion kettle and supporting auxiliary equipment on the basis of Example 1, and uses the coal combustion chamber and the mixed explosion kettle in combination. The smoke exhaust fan on the coal combustion chamber can discharge the excess smoke generated by the coal combustion, and the danger of spontaneous combustion of coal and gas co-existence disasters in goafs under different smoke concentrations can be explored. The spherical design of the mixed explosion kettle can avoid local stress concentration, increase its high-pressure resistance, and ensure safety; less material is required for the sphere under the same volume, which can effectively reduce weight and reduce costs; at the same time, if the mixed explosion kettle fails, the sphere is more likely to deform as a whole rather than break, reducing high-speed flying fragments and improving safety. The device and method provided in this embodiment explore the evolution of mass, temperature, pressure, gas components and content during the process of coal spontaneous combustion and gas explosion, and provide a necessary basis for the prevention and control of coal spontaneous combustion and gas co-existence disasters in mine goafs.

Claims

1. A goaf coal spontaneous combustion simulation experimental system, characterized by: It includes a computer control device, a coal combustion chamber, an infrared thermal imaging device, a camera device, an exhaust gas treatment device, a Fourier smoke toxicity analysis device, a fire extinguishing gas cylinder and an air cylinder; The computer control device mainly consists of a control cabinet and a display, wherein the control cabinet can be connected to the coal combustion chamber through a cable, and the control cabinet is equipped with a temperature and humidity controller for controlling the temperature, humidity and switch state of the coal combustion chamber, and can record the temperature, humidity and pressure data in the coal combustion chamber in real time; The coal combustion chamber includes an observation window A, a fully automatic electronic scale, a circulation fan, a smoke exhaust fan, a shut-off valve, a temperature sensor A and a pressure sensor A; the observation window A is made of high-temperature resistant glass and is located in the center of the coal combustion chamber; the fully automatic electronic scale is located at the center position of the bottom end of the observation window A, and its data is recorded in real time by a computer control device; the coal is laid directly above the fully automatic electronic scale; the circulation fan is fixed to the center position of the inner wall of the coal combustion chamber by bolts; a shut-off valve and a smoke exhaust fan are provided at the top of the coal combustion chamber, and the discharge of smoke is controlled by the shut-off valve. The top of the smoke exhaust fan is provided with a first interface adapted to the exhaust gas treatment device, which can be connected to the exhaust gas treatment device to timely process the discharged smoke; the data of the temperature sensor A and the pressure sensor A are recorded in real time by the computer control device; at the same time, the coal combustion chamber body is provided with a second interface, a third interface and a fourth interface, which can be connected to the Fourier smoke toxicity analysis device, an air cylinder and a fire extinguishing cylinder respectively.

2. The goaf coal spontaneous combustion simulation experimental system according to claim 1 is characterized by: The infrared thermal imaging device and the camera device are both independent devices that record and save experimental images and videos in real time. When used to monitor the spontaneous combustion process of coal residue in the goaf, both are placed directly in front of the observation window A; the exhaust gas treatment device can promptly post-process the flue gas / gas generated during the experiment; the Fourier smoke toxicity analysis device is a fully automatic continuous measurement device that can continuously test and store the components and content of flue gas / gas for a long time, and can also play back historical data.

3. The goaf coal spontaneous combustion simulation experimental system according to claim 1 is characterized by: The fire extinguishing gas cylinder is connected to the fourth interface of the residual coal combustion chamber through a pipeline, and a flow control valve B and a stop valve B are provided on the pipeline. The flow control valve B is used to adjust the fire extinguishing rate, and the stop valve B is used to control the fire extinguishing time of the residual coal combustion chamber; the air cylinder is connected to the third interface of the residual coal combustion chamber through a pipeline, and a flow control valve D and a stop valve D are provided on the pipeline. The flow control valve D is used to adjust the air rate entering the residual coal combustion chamber from the air cylinder, and the stop valve D is used to control the on-off status of the air in the residual coal combustion chamber.

4. A simulation experimental system for spontaneous combustion of coal and gas co-existence disasters in goaf, characterized by: It includes computer control device, coal combustion chamber, mixed explosion kettle, infrared thermal imaging device, camera device, tail gas treatment device, Fourier smoke toxicity analysis device, fire extinguishing gas cylinder, air gas cylinder and gas cylinder; The computer control device consists of a control cabinet and a display, wherein the control cabinet is connected to the coal combustion chamber and the mixed explosion kettle through cables, and the control cabinet is equipped with a temperature and humidity controller for controlling the temperature, humidity and switch status of the coal combustion chamber and the mixed explosion kettle, and recording the temperature, humidity and pressure data in the coal combustion chamber and the mixed explosion kettle in real time; The coal combustion chamber includes an observation window A, a fully automatic electronic scale, coal, a circulation fan, a smoke exhaust fan, a shut-off valve, a temperature sensor A and a pressure sensor A; the observation window A is made of high-temperature resistant glass and is located in the center of the coal combustion chamber; the fully automatic electronic scale is located at the center position of the bottom end of the observation window A, and its data is recorded in real time by a computer control device; the coal is laid directly above the fully automatic electronic scale; the circulation fan is fixed to the center position of the inner wall of the coal combustion chamber by bolts; a shut-off valve and a smoke exhaust fan are provided at the top of the coal combustion chamber, and the discharge of smoke is controlled by the shut-off valve. The top of the smoke exhaust fan is provided with a first interface adapted to the exhaust gas treatment device, which can be connected to the exhaust gas treatment device to promptly process the discharged smoke; the data of the temperature sensor A and the pressure sensor A are recorded in real time by the computer control device; at the same time, the coal combustion chamber body is provided with a second interface, a third interface and a fourth interface, which are respectively connected to the Fourier smoke toxicity analysis device, the air cylinder and the fire extinguishing cylinder; The mixed explosion kettle includes a temperature sensor B, a pressure sensor B, a vacuum device, a magnetic stirrer, an observation window B, an infrared thermal imaging window and a camera window; the mixed explosion kettle is connected to the residual coal combustion chamber through a high-temperature resistant air duct; the infrared thermal imaging window and the camera window are respectively adapted to the lenses of the infrared thermal imaging device and the camera device, and can directly take photos or videos to record the experimental process in real time; the outside of the mixed explosion kettle is provided with a fifth interface, a sixth interface, a seventh interface, an eighth interface and a ninth interface, which can be respectively connected to the exhaust treatment device, the Fourier smoke toxicity analysis device, the air cylinder, the fire extinguishing cylinder and the gas cylinder.

5. The goaf coal spontaneous combustion and gas symbiosis disaster simulation experimental system according to claim 4 is characterized by: The temperature and humidity in the mixed explosion kettle can be directly coupled with the temperature and humidity in the residual coal combustion chamber, or can be controlled separately by a computer control device; the temperature sensor B and pressure sensor B respectively monitor the temperature and pressure in the mixed explosion kettle in real time, and are recorded by the computer control device; a flow control valve A and a shut-off valve A are provided on the high-temperature resistant air duct, and the amount of flue gas entering the mixed explosion kettle from the residual coal combustion chamber is adjusted by the flow control valve A, and the on and off of the flue gas is controlled by the shut-off valve A.

6. The goaf coal spontaneous combustion and gas symbiosis disaster simulation experimental system according to claim 4 is characterized by: The infrared thermal imaging device and the camera device are both independent devices, which can record and save experimental images and videos in real time. When used to monitor the spontaneous combustion of coal residue and gas symbiosis disaster process in the goaf, the lenses of the infrared thermal imaging device and the camera device are first placed in front of the observation window A, and then placed on the infrared thermal imaging window and the camera window on the mixed explosion kettle respectively; the exhaust gas treatment device is connected to the smoke exhaust fan and the mixed explosion kettle through the first interface and the fifth interface respectively, and can timely post-process the flue gas / gas generated in the coal residue combustion chamber and the mixed explosion kettle during the experiment; the Fourier smoke toxicity analysis device is a fully automatic continuous measuring device, which can continuously test and store the components and content of flue gas / gas for a long time, and can also play back historical data. When monitoring the spontaneous combustion of coal residue and gas symbiosis disaster process in the goaf, the Fourier smoke toxicity analysis device is first connected to the coal residue combustion chamber by a cable through the second interface, and then connected to the mixed explosion kettle by a cable through the sixth interface.

7. The goaf coal spontaneous combustion and gas symbiosis disaster simulation experimental system according to claim 4 is characterized by: The fire extinguishing gas cylinder adjusts the fire extinguishing rate through the flow control valve B, and controls the fire extinguishing time of the residual coal combustion chamber and the mixed explosion kettle through the stop valve B and the stop valve F respectively; the gas cylinder adjusts the gas rate entering the mixed explosion kettle through the flow control valve C, and controls the gas on and off through the stop valve C; the air cylinder adjusts the air rate entering the residual coal combustion chamber or the mixed explosion kettle from the air cylinder through the flow control valve D, and controls the air on and off in the residual coal combustion chamber and the mixed explosion kettle respectively through the stop valve D and the stop valve E.

8. The goaf coal spontaneous combustion and gas symbiosis disaster simulation experimental system according to claim 4 is characterized by: The computer control system used in the present invention adopts a Labview program, which can automatically control the heating rate of 2°C to 10°C / min. It is connected to the coal combustion chamber and the mixed explosion kettle via cables, and can control the temperature, humidity and switch status of each system, and has the function of real-time data recording and analysis. The mixing explosion kettle is a spherical high-pressure container made of SUS#316 stainless steel, with an inner diameter of 700mm and an internal volume of approximately 1000L. It can withstand a maximum pressure of ≥3MPa and a constant pressure of ≥2.5MPa. The vacuum pump of the vacuum device has a pumping rate of ≥10L / s and a vacuum degree of ≤1.0kPa. The magnetic stirrer is made of insulating and high-temperature resistant material and is located at the bottom of the mixing explosion kettle. The observation window B is made of high-pressure resistant glass and is located in the center of the mixing explosion kettle. The Fourier smoke toxicity analysis device uses mid-infrared full spectrum analysis with a spectral range of 500~4500cm -1 , can measure more than 50 gas components simultaneously, and has a database of more than 400 reference gases.

9. A method for simulating spontaneous combustion of coal in goaf, using the system for simulating spontaneous combustion of coal in goaf according to any one of claims 1 to 3, characterized in that The following steps are involved: S1: Connect the Fourier smoke toxicity analyzer, air cylinder, and fire extinguishing cylinder to the coal combustion chamber through the second, third, and fourth interfaces, respectively. Connect the smoke exhaust fan and tail gas treatment device through the first interface. Check whether the cables are in good contact and the airtightness of the devices. At the same time, place the infrared thermal imaging device and camera device directly in front of the observation window A. S2: Weigh the residual coal according to the set mass and place it on the fully automatic electronic scale in the residual coal combustion chamber; S3: Open the stop valve D and adjust the rate of air entering the coal combustion chamber through the flow control valve D. When the set pressure is reached, close the stop valve D; S4: The humidity, temperature rise range and temperature rise rate in the coal combustion chamber are set by the computer control device, and the infrared thermal imaging device and the camera device are turned on to capture experimental images and videos in real time; S5: Observe the temperature and pressure values ​​in the coal combustion chamber displayed on the computer control device. When the temperature and pressure rise sharply, the coal begins to spontaneously combust. Stop heating and start the Fourier smoke toxicity analysis device. When the temperature and pressure tend to stabilize, the coal spontaneous combustion ends. Open the stop valve B and extinguish the open flame with the fire extinguishing gas cylinder. S6: Open the shut-off valve to discharge excess flue gas through the exhaust fan, and use the exhaust gas treatment device to post-treat the flue gas; S7: Export the temperature and pressure data and the coal quality change data from the computer control device, export the relevant data from the infrared thermal imaging device, the camera device and the Fourier smoke toxicity analysis device, and close each experimental device, and the experiment ends.

10. A method for simulating the spontaneous combustion of coal and gas co-existence disaster in goaf, using the simulating experimental system for the spontaneous combustion of coal and gas co-existence disaster in goaf according to any one of claims 4 to 8, characterized in that The following steps are involved: S1: Connect the Fourier smoke toxicity analysis device to the coal combustion chamber through the second interface, connect the air cylinder to the coal combustion chamber and the mixed explosion kettle through the third interface and the seventh interface respectively, connect the fire extinguishing cylinder to the coal combustion chamber and the mixed explosion kettle through the fourth interface and the eighth interface respectively, connect the exhaust gas treatment device to the smoke exhaust fan and the mixed explosion kettle through the first interface and the fifth interface respectively, and check whether the contact of each cable is good and the air tightness of the device, at the same time, place the infrared thermal imaging device and the camera device in front of the observation window A, and connect the gas cylinder to the mixed explosion kettle through the ninth interface; S2: Weigh the residual coal according to the set mass and place it on the fully automatic electronic scale in the residual coal combustion chamber; S3: Open the stop valve D and adjust the rate of air entering the coal combustion chamber through the flow control valve D. When the set pressure is reached, close the stop valve D; S4: Open the vacuum pumping device to evacuate the mixed explosion kettle, then close the vacuum pumping device and open the stop valve C and stop valve E. Use the flow control valve C and flow control valve D to control the ratio of gas and air respectively. After reaching the set pressure, close the stop valve C and stop valve E. S5: The humidity, temperature rise range and temperature rise rate of the residual coal combustion chamber are set by the computer control device, and coupled with the temperature and humidity in the mixed explosion kettle. The infrared thermal imaging device and the camera device are turned on to capture experimental images and videos in real time; S6: Observe the temperature and pressure values ​​in the coal combustion chamber displayed on the computer control device. When the temperature and pressure rise sharply, the coal begins to spontaneously combust. Stop heating the coal combustion chamber and start the Fourier smoke toxicity analysis device. When the temperature and pressure tend to stabilize, the coal spontaneous combustion ends, and open the stop valve B to extinguish the open flame with the fire extinguishing gas cylinder. S7: Remove the Fourier smoke toxicity analysis device from the residual coal combustion chamber and connect it to the mixed explosion kettle through the sixth interface, and place the infrared thermal imaging device and the camera lens on the infrared thermal imaging window and the camera window of the mixed explosion kettle respectively; S8: Continue heating the mixed explosion kettle at the heating rate in S5, and open the stop valve A on the high-temperature resistant gas channel. Control the amount of flue gas entering the mixed explosion kettle from the residual coal combustion chamber through the flow control valve A. Simultaneously, turn on the infrared thermal imaging device, the camera device, and the Fourier smoke toxicity analysis device. When a violent sound is heard, an explosion occurs in the mixed explosion kettle. Stop heating, close the stop valve A, and open the stop valve F to extinguish the open flame using the fire extinguishing gas cylinder. S9: Use tail gas treatment device to post-treat the gas in the mixed explosion kettle and the residual flue gas in the residual coal combustion chamber; S10: Export the temperature and pressure data and the coal quality change data from the computer control device, export the relevant data from the infrared thermal imaging device, the camera device and the Fourier smoke toxicity analysis device, and close each experimental device, and the experiment ends.

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