Goaf spontaneous combustion multi-field coupling and intelligent sensing prevention and control comprehensive experiment system and method

Abstract

The invention provides a goaf spontaneous combustion multi-field coupling and intelligent sensing prevention and control comprehensive experiment system and method. The system comprises an experiment module, a high-precision environment sensing module, an environment regulation and control module, an inhibition liquid transmission and distribution module, a multi-mode injection unit and a data analysis and processing module. The method comprises the following steps: S1, simulating a goaf residual coal environment, arranging each module, and performing self-inspection and preheating; s2, setting environmental parameters, stabilizing the environmental parameters at set values, and monitoring the covering conditions of the inhibition liquid and the gel on the surface of the coal body and the applied pressure; s3, sensing temperature and humidity; the gas concentration is monitored, and the atomization particle size of the inhibition liquid and injection of gel are regulated and controlled; s4, monitoring the temperature, humidity and pressure change of the surface of the coal body; the inhibition liquid diffusion behavior, the gel phase change process and the temperature field spatio-temporal evolution are captured; s5, closing the injection and regulation system, and continuing to collect data; it is ensured that the inhibition liquid and the gel act on the target area, the ineffective effect is reduced, and the accuracy is improved; the problem that traditional manual goaf spontaneous combustion and recombustion prevention and control experience is insufficient is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal spontaneous combustion disaster prevention, in particular to a goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experiment system and method. BACKGROUND

[0002] Coal spontaneous combustion is a very serious natural disaster in the process of coal production, which may cause significant economic losses, induce poisoning accidents of operating personnel, trigger chain reactions such as gas and coal dust explosion, and also cause secondary disasters such as damage to production equipment and irreversible loss of coal resources. The goaf coal spontaneous combustion disaster causes direct economic losses of more than 5 billion yuan per year, and releases a large amount of toxic gases such as CO and CO2.

[0003] In the traditional prevention scheme, the design of the spraying parameter of the inhibiting liquid depends on artificial experience, and it is difficult to control the accurate diffusion of the inhibiting liquid, resulting in low fire extinguishing efficiency and high re-ignition rate. Moreover, the multi-field coupling effect of the temperature field-humidity field-air flow field in the goaf is not considered, the spontaneous combustion evolution law under different working conditions cannot be simulated, the effect of the inhibiting liquid lacks predictability, and the goaf spontaneous combustion and re-ignition rate are high. SUMMARY

[0004] The present application aims to provide a goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experiment system and method, which matches the inhibiting liquid according to the environment of the goaf by simulating the complex working conditions of the goaf, realizes the accurate spraying of the inhibiting liquid, accurately controls the injection amount, pressure and position, and reduces the goaf spontaneous combustion and re-ignition rate of residual coal.

[0005] To this end, the technical scheme adopted by the present application is as follows: a goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experiment system, comprising an experimental cabin arranged with simulated coal samples and a high-precision environment perception module arranged in the experimental cabin, wherein the experimental cabin is connected with an environment control module, an inhibiting liquid delivery module, a multi-modal injection unit and a data analysis and processing module.

[0006] The high-precision environment perception module comprises a distributed thin-film temperature and humidity sensor array, a large-area flexible thin-film pressure sensor array, a micro-chromatograph and a data transmission module, the environment control module comprises a temperature and humidity regulator, a variable frequency centrifugal air compressor and a control box, the inhibiting liquid delivery module comprises a magnetic stirring storage tank, a diaphragm metering pump, a closed-loop flow control system and an online conductivity monitor, the multi-modal injection unit comprises a gel storage tank, a high-pressure grouting pump and an inhibiting liquid atomization module, and the data analysis and processing module is signal connected with the high-precision environment perception module, the environment control module, the inhibiting liquid delivery module and the multi-modal injection unit, and adjusts the delivery of the inhibiting liquid according to the change of the environment.

[0007] As the preferred solution of the above scheme, the distributed thin film temperature and humidity sensor array is buried 1-2 cm below the surface of the coal sample, and a measuring point is arranged every 20 cm, the large-area flexible thin film pressure sensor array is arranged to cover the surface of the coal sample, the micro chromatograph is installed on the outer side wall of the experimental cabin, and the sampling tube is connected to the cabin, the sampling ports of the sampling tube are uniformly distributed on the side wall of the experimental cabin, and the data transmission module is integrated on the lower part of the outer side of the cabin body, and is connected with the distributed thin film temperature and humidity sensor array and the large-area flexible thin film pressure sensor array through a shielded cable, and an antenna interface for wireless communication is reserved.

[0008] Further preferably, the left side of the experimental cabin is provided with a first rack for a variable frequency centrifugal air compressor, the variable frequency centrifugal air compressor is provided with a gas supply pipeline connected with the experimental cabin, the temperature and humidity regulator comprises a humidifying element and a heating element embedded on the side wall and the bottom of the experimental cabin, and the control box is provided with a controller of the variable frequency centrifugal air compressor and a controller of the temperature and humidity regulator, and the control box is installed on the first rack.

[0009] Further preferably, the right side of the experimental cabin is provided with a second rack for mounting a magnetic stirring storage tank, the diaphragm metering pump is connected with the liquid outlet of the magnetic stirring storage tank, the online conductivity monitor is connected on the discharge port of the diaphragm metering pump, the diaphragm metering pump is connected with the inhibitor liquid atomization module, the inhibitor liquid atomization module comprises an ultrasonic atomizer connected through a conveying pipe and an atomizing nozzle group connected with the ultrasonic atomizer, and the atomizing nozzle group is composed of a plurality of arrays of atomizing nozzles arranged on the top of the experimental cabin.

[0010] Further preferably, the gel storage tank is arranged on the second rack and connected with the high-pressure grouting pump, the discharge port of the high-pressure grouting pump is connected with a grouting pipe, a grouting hole is formed in the side wall of the experimental cabin for the grouting pipe to pass through the experimental cabin for grouting, and the gel is a temperature-sensitive gel.

[0011] Further preferably, the data analysis and processing module comprises temperature sensors, humidity sensors and pressure sensors arranged in the experimental cabin, and a high-speed camera system and an infrared thermal imager for collecting inhibitor liquid flow data arranged outside the experimental cabin, and the temperature sensors, humidity sensors, pressure sensors, high-speed camera system and infrared thermal imager are signal connected with the data analysis and processing module.

[0012] A kind of goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental method, specific steps are as follows:

[0013] S1, lay the corresponding thickness of standard coal sample in the experimental cabin to simulate the environment of residual coal in goaf, distribute the distributed temperature and humidity sensor and pressure sensor array in the coal seam, connect the power supply, start the high-precision environment perception array, environment control module, resistance liquid transportation and distribution module, multi-mode injection unit through data analysis and processing module, and perform self-checking and preheating;

[0014] S2, set the environmental parameters in the experimental cabin through the environment control module, so that the environmental parameters in 4-6 min are stable at the set value, start the diaphragm metering pump, and pre-circulate the pipeline at a flow rate of 1.1-1.3 L / min, and feedback in real time through the online conductivity monitor to ensure that the solution concentration stability error is within ±1%, and monitor the coverage of the sprayed resistance liquid and the injected gel on the surface of the coal body and the applied pressure through the large-area flexible thin film pressure sensor array;

[0015] S3, the current temperature and humidity in the simulated goaf are sensed by the temperature and humidity sensor, and the corresponding signals are transmitted to the data analysis and processing module, and the current temperature and humidity conditions are displayed by the display provided by the data analysis and processing module; at the same time, the microchromatograph is operated to monitor the change of gas concentration in the goaf, and the current environmental data is transmitted to the data analysis and processing module, and the data analysis and processing module is analyzed according to the environmental temperature and humidity data, CO, CH4, O2 and other gas concentration data, and the atomization particle size, flow rate, injection angle and initial velocity of the resistance liquid are adjusted, and the gel is injected;

[0016] S4, the spraying of the resistance liquid and the injection of the gel last for 5-6 minutes, during which the high-precision environment perception array monitors the temperature and humidity and pressure change of the coal body surface in real time with a sampling frequency of 10 Hz; the high-speed camera system monitors the airflow disturbance; the high-speed camera and the infrared thermal imager capture the resistance liquid diffusion behavior, the gel phase change process and the temperature field space-time evolution synchronously;

[0017] S5, after the experiment is terminated, the injection and control system is turned off, and the data is collected for 10-12 minutes to observe the temperature drop and the gel solidification effect; finally, all the experimental data is exported, the temperature drop rate, the resistance liquid coverage rate and the residence time are analyzed and calculated, and a multi-field coupling evolution report is generated to quantitatively evaluate the prevention and control effect.

[0018] As a preferred embodiment of the above-mentioned scheme, the data of each sensor is transmitted to the data analysis and processing module in real time, the synchronous delay is less than 10 ms, the data analysis and processing module performs dynamic analysis on the atomization parameters and environmental response data every 5 seconds, and feeds back the injection angle and flow rate of the nozzle array to realize the targeted adaptive deposition of the resistance liquid in the simulated fire source area.

[0019] The beneficial effects of the present application: by arranging the coal sample in the experimental cabin to simulate the goaf, and monitoring the environment in the coal sample in real time by the high-precision environment perception array, according to the monitored values, the environment control module is adjusted in real time to ensure that the environment of the coal sample is consistent with the goaf; the large-area flexible film pressure sensing array perceives the pressure distribution in the coal sample through the change of resistance, so as to monitor the coverage of the sprayed resistance liquid, the injected gel on the surface of the coal body and the applied pressure, and to study the flow law of the temperature-sensitive gel after being injected into the coal sample; according to the actual demand of the coal sample, the spraying of the resistance liquid is controlled to avoid the waste of resources caused by spraying deviation, ensure that the resistance liquid acts on the target area, reduce the invalid effect of the resistance liquid, improve the precision of fire prevention and extinguishing of the resistance liquid, and improve the efficiency; effectively solve the problem of insufficient experience in preventing and controlling spontaneous combustion and rekindling in traditional manual goaf, and enhance the stability and reliability of the prevention process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application.

[0021] Figure 2 is a structural schematic diagram of the frequency conversion centrifugal air compressor in the present application.

[0022] Figure 3 is a structural schematic diagram of the resistance liquid storage tank in the present application.

[0023] Figure 4 is a structural schematic diagram of the diaphragm metering pump in the present application.

[0024] Figure 5 is a structural schematic diagram of the high-pressure grouting pump in the present application. DETAILED DESCRIPTION

[0025] The present application will be further described below in combination with the drawings and examples.

[0026] As shown in Figures 1-5 , the goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system includes an experimental cabin 1 arranged with a simulated coal sample and a high-precision environment perception module arranged in the experimental cabin 1, and the experimental cabin 1 is connected with an environment control module, a resistance liquid conveying and distribution module, a multi-modal injection unit and a data analysis and processing module 9.

[0027] The data analysis and processing module 9 includes temperature sensors, humidity sensors and pressure sensors arranged in the experimental cabin 1, and a high-speed camera system and an infrared thermal imager arranged outside the experimental cabin 1 for collecting resistance liquid flow data, and the temperature sensors, humidity sensors, pressure sensors, high-speed camera system and infrared thermal imager are all signal connected with the data analysis and processing module 9.

[0028] The high-precision environment sensing module (not shown in the figure) includes a distributed thin film temperature and humidity sensor array, a large-area flexible thin film pressure sensing array, a micro chromatograph, and a data transmission module. The distributed thin film temperature and humidity sensor array is embedded 1-2 cm below the surface of the coal sample, with a measuring point every 20 cm. The large-area flexible thin film pressure sensing array is attached to the surface of the coal sample and covers the entire surface. The micro chromatograph is installed on the outer side wall of the experimental cabin 1 and connected to the cabin through a sampling tube. The sampling ports of the sampling tube are evenly distributed on the side wall of the experimental cabin 1. The data transmission module is integrated on the lower part of the outer side of the cabin body and connected to the distributed thin film temperature and humidity sensor array and the large-area flexible thin film pressure sensing array through shielded cables. An antenna interface for wireless communication is also provided.

[0029] The temperature detection range of the high-precision environment sensing module is between -20 and 80℃, with a detection accuracy of ±0.1℃. The humidity detection range is between 0 and 100%RH, with a detection accuracy of ±0.3%RH. The pressure range is between 0 and 10MPa, with a resolution of ±0.5kPa and a sampling frequency of 10Hz. The detection concentrations of the components of the micro chromatograph (not shown in the figure) are as follows: CO concentration between 0.1 and 5000ppm, C2H4 concentration between 0.05 and 1000ppm, C2H2 concentration between 0.05 and 1000ppm, CH4 concentration between 1ppm and 100%vol, O2 concentration between 0.1 and 25%vol. The wireless sensor network controls the data error within ±1.5%.

[0030] The environment control module includes a temperature and humidity regulator (not shown in the figure), a variable frequency centrifugal air compressor 2, and a control box 3. The left side of the experimental cabin 1 is provided with a first rack for the variable frequency centrifugal air compressor 2. The variable frequency centrifugal air compressor 2 is provided with a gas supply pipeline connected to the experimental cabin 1. The temperature and humidity regulator includes humidifying elements and heating elements embedded in the side wall and bottom of the experimental cabin 1. The control box 3 is provided with a controller of the variable frequency centrifugal air compressor 2 and a controller of the temperature and humidity regulator. The control box 3 is installed on the first rack.

[0031] The variable frequency centrifugal air compressor 2 controls the air volume range between 0 and 50m³ / min (accuracy ±1%), with a positioning accuracy of ±1mm and a pressure fluctuation of <0.5kPa. The temperature and humidity regulator controls the temperature range between 15 and 45℃ (±0.5℃) and the humidity range between 30 and 95%RH (±3%), with a maximum temperature of 300℃ (±1℃) and a dynamic response time of <30s.

[0032] The variable frequency centrifugal air compressor 2 uses the air inlet regulating valve 201 and the impeller 202 to regulate the air inlet. The air enters the high-speed rotating impeller 202 from the air inlet regulating valve 201. The impeller 202 works on the gas. The gas flow rate increases, and the kinetic energy increases. The high-speed gas enters the diffuser 203, the speed decreases, the kinetic energy is converted into pressure energy, and the gas pressure increases to become high-pressure gas. The high-pressure gas is collected in the volute 204, connected to the air outlet 205 and the air supply pipeline, and enters the experimental cabin 1. At the same time, the temperature and humidity in the experimental cabin 1 are adjusted by the temperature and humidity regulator.

[0033] The retardant liquid delivery module includes a magnetic stirring storage tank 4, a diaphragm metering pump 5, a closed-loop flow control system (not shown in the figure), and an online conductivity monitor (not shown in the figure). A second rack for mounting the magnetic stirring storage tank 4 is arranged on the right side of the experimental cabin 1. The diaphragm metering pump 5 is connected to the liquid outlet of the magnetic stirring storage tank 4. The online conductivity monitor is connected to the discharge port of the diaphragm metering pump 5. The diaphragm metering pump 5 is connected to the retardant liquid atomization module 8. The retardant liquid atomization module 8 includes an ultrasonic atomizer connected by a conveying pipe and an atomizing nozzle group connected to the ultrasonic atomizer. The atomizing nozzle group is composed of a plurality of arrayed atomizing nozzles arranged on the top of the experimental cabin 1.

[0034] The atomizing nozzle adopts a high-pressure fan-shaped nozzle with a rotatable ball head, so as to change the direction of the nozzle by the rotatable ball head (360-degree adjustable). The distance between the striker and the impact groove is adjusted by the electric telescopic rod in the nozzle. The lower the striker (the smaller the distance to the impact groove), the greater the water flow impact force, and the smaller the atomized particle size (which can be adjusted from "coarse mist" to "fine mist"). Conversely, the particle size is larger. The jet angle / range: the striker height changes the jet direction of the water flow (the impact groove is a cross-shaped structure). The smaller the distance, the more concentrated the jet range (small angle); the greater the distance, the wider the jet range (large angle); flow and initial velocity: the striker height adjusts the cross-sectional area of the water flow channel (the lower the striker, the smaller the channel), thereby changing the flow (small channel→small flow) and the initial velocity (small channel→high speed). This is prior art, and will not be described here.

[0035] The capacity of the magnetic stirring storage tank 4 is 10L. The flow rate of the diaphragm metering pump 5 is between 0.1 and 10L / h (with a precision of ±1%). The precision of the conductivity monitor is ±1μS / cm. The response time of the closed-loop flow control system is <0.1s.

[0036] The magnetic stirring tank 4 is provided with a magnetic stirrer 401, and the stirring shaft end of the magnetic stirrer 401 is provided with a stirring impeller 202. The magnetic stirrer 401 drives the stirring impeller 202 to continuously stir at a speed of 200 rpm, so as to ensure that the solution is uniform. The solution in the magnetic stirring tank 4 is metered by a diaphragm metering pump 5. The diaphragm metering pump 5 comprises a pump cavity 501, a first motor 502 arranged on the pump cavity 501, and a first plunger 503 connected with the first motor 502. The first motor 502 drives the first plunger 503 to move to the left side, so that the resistance liquid enters the pump cavity 501 from the inlet valve 504 below the pump body. The first motor 502 drives the first plunger 503 to move to the right side, and the resistance liquid is discharged from the outlet valve 505 below the pump body. The pipeline is pre-circulated at a flow rate of 1.2 L / min, and real-time feedback is realized through an online conductivity monitor, so as to ensure that the solution concentration stability error is within ±1%.

[0037] The multi-modal injection unit comprises a gel storage tank 6, a high-pressure grouting pump 7, and a resistance liquid atomization module 8. The gel storage tank 6 is arranged on the second rack and connected with the high-pressure grouting pump 7. The high-pressure grouting pump 7 is connected with a grouting pipe. The grouting hole is arranged on the side wall of the experimental cabin 1 for the grouting pipe to pass through the experimental cabin 1 for grouting. The gel is a temperature-sensitive gel.

[0038] The gel injection process is as follows: the second motor 701 of the high-pressure grouting pump 7 is started. The power is converted into the reciprocating motion of the second plunger 703 through the reduction box and the tile transmission mechanism 702. When the second plunger 703 moves backward, the volume of the pump cavity 501 increases to form a vacuum. The suction valve is opened, and the discharge valve is closed. The gel is sucked from the liquid suction port 704. After the gel is sucked, the high-pressure grouting pump 7 drives the second plunger 703 to move forward through the reduction box and the tile transmission mechanism 702. The volume of the pump cavity 501 decreases to form a negative pressure. The suction valve is closed, and the discharge valve is opened. The gel is discharged from the liquid discharge port 705 into the grouting pipe connected with the liquid discharge port 705 and injected into the experimental cabin 1.

[0039] The data analysis and processing module 9 comprises temperature sensors, humidity sensors, and pressure sensors arranged in the experimental cabin 1, and a high-speed camera system and an infrared thermal imager arranged outside the experimental cabin 1 for collecting the flow law of the gel. The system can collect environmental and fluid data. The range of the flow rate measured by the high-speed camera system is between 0.001 and 50 m / s (with an accuracy of ±0.01 m / s). The frame rate is 1000 fps (resolution 1920×1080). The thermal sensitivity is 0.03℃. The temperature measurement range is between -20 and 650℃. The multi-source data synchronous delay is less than 10 ms. The machine learning model response time is less than 5 s.

[0040] The temperature sensor and the humidity sensor are connected with a signal receiving target arranged in the data analysis processing module 9, the signal receiving target receives the temperature and humidity signals received and transmits them to the data analysis processing module 9 for processing, and the data analysis processing module 9 displays the processed temperature and humidity signals on the display screen to display the temperature and humidity in the coal sample in real time.

[0041] The data analysis processing module 9 analyzes and processes the environmental data in the experiment cabin 1 collected by the temperature sensor and the humidity sensor and the gel fluid data collected by the high-speed camera system and the infrared thermal imager to obtain the demand of the blocking liquid in each part of the coal seam, and then controls the blocking liquid delivery module to deliver the blocking liquid on demand, realizes the precise control of the blocking liquid through the diaphragm metering pump, the closed-loop flow control system and the atomizing nozzle, and realizes the quantitative, timed and controllable delivery by combining the real-time feedback of the online conductivity monitor.

[0042] Finally, the data processing analysis is used to control the multi-modal injection unit to realize the precise spraying of the blocking liquid and the precise injection of the gel. The atomized particle size range of the blocking liquid atomizing module 8 is 10-200 μm, the flow range is 0.1-5 L / min (accuracy ± 2%), the spray angle of the atomizing nozzle is 0-180°, and the initial velocity is 0-20 m / s. The atomized particle size, flow, spray angle and initial velocity of the blocking liquid are cooperatively controlled; at the same time, the high-pressure grouting pump 7 is provided to accurately control the injection amount, pressure and position of the gel, and ensure the stability of the flow.

[0043] A kind of goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental method, specific steps are as follows:

[0044] S1, the corresponding thickness standard coal sample is laid in the experiment cabin 1 to simulate the goaf residual coal environment, the distributed temperature and humidity sensor and pressure sensor array are arranged in the coal seam, the power supply is connected, the high-precision environmental perception array, the environmental regulation module, the blocking liquid delivery module and the multi-modal injection unit are started by the data analysis processing module 9, and self-checking and preheating are carried out.

[0045] S2, the environmental parameters in the experiment cabin 1 are set by the environmental regulation module, so that the environmental parameters in 4-6 min are stable at the set value, the diaphragm metering pump 5 is started, the pipeline is pre-circulated at a flow rate of 1.1-1.3 L / min, and the online conductivity monitor is used to feedback in real time to ensure that the solution concentration stability error is within ± 1%, and the covering condition and the applied pressure of the sprayed blocking liquid and the injected gel on the surface of the coal body are monitored by the large-area flexible film pressure sensor array.

[0046] S3, the current analog goaf temperature and humidity are sensed by the temperature and humidity sensor, and the corresponding signal is transmitted to the data analysis processing module 9, and the display equipped with the data analysis processing module 9 displays the current temperature and humidity condition; at the same time, the microchromatograph is operated to monitor the change of gas concentration in the goaf, and the current environmental data is transmitted to the data analysis processing module 9, and the environmental temperature and humidity data, CO, CH4, O2 and other gas concentration data are analyzed to regulate the atomized particle size, flow, injection angle and initial velocity of the blocking liquid, and the gel injection is carried out;

[0047] S4, the injection of the blocking liquid and the injection of the gel last for 5-6 minutes, during which the high-precision environmental perception array monitors the temperature and humidity and pressure change of the coal body surface in real time with a sampling frequency of 10 Hz; the high-speed camera system monitors the airflow disturbance; the high-speed camera and the infrared thermal imager capture the diffusion behavior of the blocking liquid, the phase change process of the gel and the spatio-temporal evolution of the temperature field synchronously;

[0048] S5, after the experiment is terminated, the injection and regulation system is turned off, and the data is continuously collected for 10-12 minutes to observe the temperature drop and the gel curing effect; finally, all the experimental data is exported, the temperature drop rate, the blocking liquid coverage rate and the residence time are analyzed and calculated, and a multi-field coupling evolution report is generated to quantitatively evaluate the prevention and control effect.

[0049] The data of each sensor is transmitted to the data analysis processing module 9 in real time, and the synchronous delay is less than 10 ms; the data analysis processing module 9 dynamically analyzes the atomized parameters and environmental response data every 5 seconds, and feeds back to adjust the injection angle and flow of the nozzle array, so as to realize the targeted adaptive deposition of the blocking liquid in the simulated fire source area.

[0050] The coal sample is arranged in the experimental cabin 1 to simulate the goaf, and the high-precision environmental perception array monitors the environment in the coal sample in real time; according to the monitored values, the environmental regulation module is adjusted in real time to ensure that the environment of the coal sample is consistent with that of the goaf; the large-area flexible film pressure sensing array senses the pressure distribution in the coal sample through the change of resistance, so as to monitor the coverage and pressure of the sprayed blocking liquid and injected gel on the surface of the coal body, and to study the flow law of the temperature-sensitive gel after being injected into the coal sample; according to the actual demand of the coal sample, the spraying of the blocking liquid is controlled to avoid resource waste caused by spraying deviation, ensure that the blocking liquid acts on the target area, reduce the invalid effect of the blocking liquid, improve the precision of fire prevention and extinguishing of the blocking liquid, and improve the efficiency; effectively solve the problem of insufficient prevention and control experience of traditional artificial goaf spontaneous combustion and rekindling, and enhance the stability and reliability of the prevention and control process.

[0051] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely divergences of the principles and application of the present application and that numerous modifications, changes, substitutions, and alterations can be made thereto without departing from the spirit and scope of the present application, which is defined by the following claims and their equivalents.

Claims

1. A comprehensive experimental system for goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control, characterized in that: The application relates to a coal sample experiment cabin (1) provided with an analog coal sample and a high-precision environment sensing module arranged in the experiment cabin (1), wherein the experiment cabin (1) is connected with an environment control module, a retardant liquid delivery module, a multi-modal injection unit and a data analysis processing module (9). The high-precision environment sensing module comprises a distributed thin film temperature and humidity sensor array, a large-area flexible thin film pressure sensor array, a micro chromatograph and a data transmission module; the environment control module comprises a temperature and humidity regulator, a variable frequency centrifugal air compressor (2) and a control box (3); the retardant liquid delivery module comprises a magnetic stirring storage tank (4), a diaphragm metering pump (5), a closed-loop flow control system and an online conductivity monitor; the multi-modal injection unit comprises a gel storage tank (6), a high-pressure grouting pump (7) and a retardant liquid atomization module (8); and the data analysis processing module (9) is signal-connected with the high-precision environment sensing module, the environment control module, the retardant liquid delivery module and the multi-modal injection unit, and the delivery of the retardant liquid is adjusted according to the environment change.

2. The goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system according to claim 1, characterized in that: The distributed thin film temperature and humidity sensor array is embedded in the coal sample surface below 1-2 cm, and a measuring point is arranged every 20 cm; the large-area flexible thin film pressure sensor array is arranged in full coverage on the coal sample surface; the micro chromatograph is installed on the outer side wall of the experiment cabin (1) and connected into the cabin through a sampling pipe; the sampling ports of the sampling pipe are uniformly distributed on the side wall of the experiment cabin (1); and the data transmission module is integrated on the lower part of the outer side of the cabin body, connected with the distributed thin film temperature and humidity sensor array and the large-area flexible thin film pressure sensor array through shielded cables, and provided with an antenna interface for wireless communication.

3. The goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system of claim 2, characterized in that: A first rack for the variable frequency centrifugal air compressor (2) is arranged on the left side of the experiment cabin (1); the variable frequency centrifugal air compressor (2) is provided with a gas supply pipeline connected with the experiment cabin (1); the temperature and humidity regulator comprises humidifying elements and heating elements embedded on the side wall and the bottom of the experiment cabin (1); and the control box (3) is provided with a controller of the variable frequency centrifugal air compressor (2) and a controller of the temperature and humidity regulator, and installed on the first rack.

4. The goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system according to claim 3, characterized in that: A second rack for mounting the magnetic stirring storage tank (4) is arranged on the right side of the experiment cabin (1); the diaphragm metering pump (5) is connected with the liquid outlet of the magnetic stirring storage tank (4); the online conductivity monitor is connected on the discharge port of the diaphragm metering pump (5); the diaphragm metering pump (5) is connected with the retardant liquid atomization module (8); the retardant liquid atomization module (8) comprises an ultrasonic atomizer connected through a conveying pipe and a plurality of atomizing nozzle groups connected with the ultrasonic atomizer; and the atomizing nozzle groups are composed of atomizing nozzles arranged in an array on the top of the experiment cabin (1).

5. The goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system according to claim 4, characterized in that: The gel storage tank (6) is arranged on the second rack and connected with the high-pressure grouting pump (7); the discharge port of the high-pressure grouting pump (7) is connected with a grouting pipe; a grouting hole for the grouting pipe to pass through the experiment cabin (1) for grouting is formed on the side wall of the experiment cabin (1); and the gel is a temperature-sensitive gel.

6. The goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system of claim 4, characterized in that: The data analysis processing module (9) comprises a temperature sensor, a humidity sensor, a pressure sensor arranged in the experiment cabin (1), and a high-speed camera system and an infrared thermal imager arranged outside the experiment cabin (1) for collecting the flow data of the retarding liquid, and the temperature sensor, the humidity sensor, the pressure sensor, the high-speed camera system and the infrared thermal imager are all signal-connected with the data analysis processing module (9).

7. A goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experiment method, characterized in that: The application further discloses a specific implementation process of the goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experimental system. S1, a standard coal sample with a corresponding thickness is laid in the experiment cabin (1) to simulate a goaf residual coal environment, distributed temperature and humidity sensors and a pressure sensor array are arranged in the coal seam, a power supply is connected, a high-precision environment perception array, an environment regulation and control module, a retarding liquid transportation and distribution module, and a multi-modal injection unit are started through the data analysis processing module (9), and self-checking and preheating are performed; S2, the environment parameters in the experiment cabin (1) are set through the environment regulation and control module, so that the environment parameters in 4-6 minutes are stabilized at the set values, a diaphragm metering pump (5) is started, pipeline pre-circulation is performed at a flow rate of 1.1-1.3 L / min, and real-time feedback is performed through an online conductivity monitor, so that the solution concentration stability error is within ±1%, and the covering condition and the applied pressure of the sprayed retarding liquid and the injected gel on the coal surface are monitored through a large-area flexible thin film pressure sensor array; S3, the current temperature and humidity in the simulated goaf are sensed through temperature and humidity sensors, and corresponding signals are transmitted to the data analysis processing module (9), and the current temperature and humidity conditions are displayed through a display provided with the data analysis processing module (9); Meanwhile, a micro-chromatograph is operated to monitor the change of the gas concentration in the goaf, and current environmental data are transmitted to the data analysis processing module (9), the retarding liquid atomization particle size, flow rate, spraying angle and initial velocity are regulated and controlled according to the environmental temperature and humidity data, CO, CH4, O2 and other gas concentration data, and gel injection is performed; S4, the retarding liquid spraying and gel injection process lasts for 5-6 minutes, during which the high-precision environment perception array monitors the temperature and humidity and pressure change of the coal surface in real time at a sampling frequency of 10 Hz; the airflow disturbance is monitored through a high-speed camera system; the retarding liquid diffusion behavior, gel phase change process and temperature field space-time evolution are synchronously captured through a high-speed camera and an infrared thermal imager; S5, after the experiment is terminated, the injection and regulation and control system is closed, and data is continuously collected for 10-12 minutes to observe the temperature drop and the gel solidification effect; finally, all experimental data are exported, the temperature drop rate, the retarding liquid coverage rate and the retention time are analyzed and calculated, and a multi-field coupling evolution report is generated to quantitatively evaluate the prevention and control effect.

8. The goaf spontaneous combustion multi-field coupling and intelligent perception prevention and control comprehensive experiment method according to claim 7, characterized in that: The data of each sensor is transmitted to the data analysis processing module (9) in real time, the synchronous delay is less than 10 ms, the data analysis processing module (9) performs dynamic analysis on the atomization parameters and environmental response data every 5 seconds, and the spraying angle and flow rate of the nozzle array are fed back and adjusted, so that the retarding liquid is deposited in the simulated fire source area in a targeted and adaptive manner.

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