Multi-source carbon monoxide gas simulation and monitoring system in underground coal mines

Abstract

The present application relates to the technical field of mine safety monitoring, and provides a multi-source carbon monoxide gas simulation and monitoring system for underground coal mines. In the system, the underground coal mine tunnel is simulated by a mine tunnel simulation unit, and the environmental control simulation unit delivers control gas into the shell structure of the mine tunnel simulation unit, so that the airflow in the shell structure of the mine tunnel simulation unit flows to the other end of the shell structure of the mine tunnel simulation unit; in the monitoring gas simulation unit, the coal spontaneous combustion simulation module is used to simulate the spontaneous combustion of coal in the coal mine, and the explosive blasting simulation module is used to simulate the explosion of explosives in the coal mine; the vehicle exhaust simulation module simulates the exhaust gas generated by mining vehicles during the underground coal mine. Furthermore, through the coordination of each unit, the complex environmental changes of the mine tunnel are simulated, and the comprehensive simulation of multiple carbon monoxide source working conditions is flexibly realized, thereby improving the detection and analysis capabilities of underground multi-source CO gas.

Description

Technical Field

[0001] The present application relates to the technical field of mine safety monitoring, and in particular to a multi-source gas simulation and monitoring system for underground coal mines. Background Art

[0002] The coal production process is accompanied by a variety of disaster risks, including gas, coal dust, water, fire and roof disasters, among which spontaneous combustion of coal is a major hidden danger and has become a major obstacle to the sustainable development of coal mines.

[0003] The main reason for spontaneous combustion of coal is the heat released during the oxidation process of coal. If the heat cannot be dissipated in time under certain conditions, the temperature of the coal will rise, causing spontaneous combustion. In this process, a large amount of greenhouse gases and toxic and harmful gases are released, such as carbon dioxide. , Methane , Carbon monoxide , Ethylene Etc. Among them, carbon monoxide Due to its sensitivity and easy detection, it is often used as a marker gas for early prediction and warning of coal spontaneous combustion. Summary of the invention

[0004] The purpose of this application is to provide a multi-source carbon monoxide gas simulation and monitoring system for underground coal mines to solve or alleviate the problems existing in the above-mentioned prior art.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] The present application provides a multi-source carbon monoxide gas simulation and monitoring system for underground coal mines, comprising: a mine tunnel simulation unit, which is a shell structure, wherein a plurality of groups of monitoring sensors are installed on the top surface of the shell structure along the length direction, and a plurality of reserved interfaces are arranged on the side surface;

[0007] An environmental control simulation unit is connected to one end of the mine tunnel simulation unit and is used to deliver control gas into the shell structure of the mine tunnel simulation unit so that the airflow in the shell structure of the mine tunnel simulation unit flows to the other end of the shell structure of the mine tunnel simulation unit to adjust the temperature, humidity and wind speed in the shell structure of the mine tunnel simulation unit;

[0008] The monitoring gas simulation unit includes: a coal spontaneous combustion simulation module, an explosive blasting simulation module and a vehicle exhaust simulation module; the coal spontaneous combustion simulation module is used to simulate the spontaneous combustion of coal in the coal mine, and the explosive blasting simulation module is used to simulate the explosion of explosives in the coal mine, and the coal spontaneous combustion simulation module and the explosive blasting simulation module are respectively connected to two of the plurality of reserved interfaces, so that the gas generated by the spontaneous combustion simulation and the blasting smoke generated by the explosion simulation can flow freely into the shell structure of the mine tunnel simulation unit, and flow from one end where the environmental control simulation unit is installed to the other end in the mine tunnel simulation unit;

[0009] The vehicle exhaust simulation module is used to simulate the exhaust emissions generated by mining vehicles when traveling underground in the coal mine;

[0010] Among them, multiple groups of monitoring sensors are used to carry out real-time monitoring of the temperature, humidity, first gas concentration, second gas concentration, third gas concentration, mixed carbon monoxide concentration and wind speed at different positions within the shell structure of the mine tunnel simulation unit; wherein, the first gas concentration, the second gas concentration and the third gas concentration are the concentrations of characteristic gases generated by the coal spontaneous combustion simulation module, the explosive blasting simulation module and the vehicle exhaust simulation module respectively.

[0011] Preferably, the environmental control simulation unit includes: a variable frequency fan, a water tank and a guide plate; the variable frequency fan is located outside the mine tunnel simulation unit, and the outlet of the variable frequency fan is installed with a reducer, the other end of the reducer is connected to one end of the shell structure of the mine tunnel simulation unit through a square tube, and the side wall of the square tube is connected to the water tank; wherein the guide plates are installed at both ends of the square tube, and the guide plates are used to evenly adjust the regulated gas entering the shell structure of the mine tunnel simulation unit, and a plurality of temperature control devices are installed in the water tank to adjust the temperature and humidity of the regulated gas.

[0012] Preferably, the coal spontaneous combustion simulation module and the explosive blasting simulation module are respectively connected to the reserved interface on the shell structure of the mine tunnel simulation unit through a second gas pipeline; or, the coal spontaneous combustion simulation module and the explosive blasting simulation module are respectively directly connected to the reserved interface.

[0013] Preferably, it also includes: a gas mixing regulator, wherein the gas mixing regulator has a gas inlet connected to a plurality of gas cylinders filled with different gases, and the gas mixing regulator has a plurality of gas outlets, and the plurality of gas outlets are respectively connected to the coal spontaneous combustion simulation module and the explosive blasting simulation module, so as to respectively introduce a mixed gas with a first preset oxygen concentration into the coal spontaneous combustion simulation module, and introduce a mixed gas with a second preset oxygen concentration into the explosive blasting simulation module.

[0014] Preferably, the coal spontaneous combustion simulation module comprises: a heating shell, a heating device, an electronic balance, a placement tray and a temperature sensor; the heating shell is a shell structure with a gas circulation interface provided on the side, and the gas circulation interface is adapted and communicated with one of the plurality of reserved interfaces;

[0015] The placement tray is located in the heating shell and is a barrel structure with an upper end opening, and an air distribution plate is provided at the bottom of the barrel structure, and a plurality of gas through holes are arranged on the air distribution plate; the coal sample is evenly laid in the placement tray; wherein the diameter of the gas through hole is smaller than the particle size of the coal sample;

[0016] The heating device is located below the placement tray and is a cylindrical shell structure. The upper layer is a multi-layer resistance wire wrapped by a temperature-resistant material, and the lower layer is a heat-insulating material. A hollow cavity is formed between the upper multi-layer resistance wire and the lower heat-insulating material, and a heating gas inlet connected to the hollow cavity is radially arranged on the heating device, and a heating gas outlet connected to the hollow cavity is axially arranged on the upper layer of the heating device; wherein the multi-layer resistance wire is used to heat and increase the temperature of the coal sample in the placement tray; the heating gas inlet is connected to one of the multiple outlets of the gas mixing regulator, and the heating gas outlet is used to uniformly flow the mixed gas preheated by the multi-layer resistance wire through the multiple gas through holes on the air distribution plate through the coal sample;

[0017] The electronic balance is located below the heating device and is used to monitor the mass change of the coal sample in real time during the heating process;

[0018] There are two temperature sensors, both of which are installed on the top plate of the heating shell. The temperature probe of one of the temperature sensors extends axially into the heating shell and is inserted into the coal sample, so as to monitor the internal temperature of the coal sample in real time during spontaneous combustion; the temperature probe of the other temperature sensor extends axially into the heating shell and is located above the coal sample, so as to monitor the ambient temperature of the coal sample in real time during spontaneous combustion.

[0019] Preferably, the explosive blasting simulation module comprises: an explosion simulation shell, an igniter and an explosive placement plate; the explosion simulation shell is provided with a gun smoke circulation interface and a mixed gas interface, the gun smoke circulation interface is located on the side wall of the explosion simulation shell, and is adapted to communicate with one of the multiple reserved interfaces, and the mixed gas interface is located on the bottom plate of the explosion simulation shell, and is connected to one of the multiple gas outlets of the gas mixing regulator;

[0020] The explosive placement plate is located inside the explosion simulation shell and is used for placing the blasting simulation explosives; the igniter is installed on the top plate of the explosion simulation shell and is used to detonate the blasting simulation explosives; wherein the igniter is screwed onto the top plate of the explosion simulation shell to adjust the depth of the igniter extending into the explosion simulation shell.

[0021] Preferably, the vehicle exhaust simulation module comprises: an explosion-proof diesel engine and an exhaust emission simulation trolley, wherein the explosion-proof diesel engine is located outside the mine tunnel simulation unit and is connected to an exhaust gas discharge port provided in a shell structure of the mine tunnel simulation unit through an exhaust gas pipeline, so as to discharge the generated combustion exhaust gas through the exhaust gas discharge port in the shell structure of the mine tunnel simulation unit;

[0022] The exhaust gas emission simulation trolley is located in the mine tunnel simulation unit and can move along the length direction in the shell structure of the mine tunnel simulation unit; wherein the exhaust gas emission port moves with the exhaust gas emission simulation trolley to simulate the emission of exhaust gas generated by the mining vehicle during its travel underground in the coal mine.

[0023] Preferably, a guide track is provided in the mine tunnel simulation unit along the length direction, and the exhaust emission simulation trolley is placed on the guide track so that the exhaust emission simulation trolley moves along a fixed path.

[0024] Preferably, there are two exhaust gas emission simulation carts, and the two exhaust gas emission simulation carts are respectively moving towards each other from the two ends of the mine tunnel simulation unit; correspondingly, there are two exhaust gas emission ports, and the two exhaust gas emission ports are respectively matched with the two exhaust gas emission simulation carts, and move with the two exhaust gas emission simulation carts respectively; wherein, an independent gas flow meter is provided on the connecting pipe connected to the two exhaust gas emission ports to independently control the exhaust gas flow rate emitted by each exhaust gas emission simulation cart.

[0025] Preferably, it also includes: a harmful gas treatment device, which is connected to the exhaust pipe of the explosion-proof diesel engine through a multi-way valve, and is used to harmlessly treat the excess exhaust gas generated by the explosion-proof diesel engine; a cooling barrel is also provided between the multi-way valve and the exhaust pipe of the explosion-proof diesel engine, and the multi-way valve and the exhaust pipe are connected by a spiral pipe, and the spiral pipe is located in the cooling barrel filled with a cooling medium, so as to cool the combustion exhaust gas discharged by the explosion-proof diesel engine.

[0026] Beneficial effects:

[0027] In the multi-source carbon monoxide gas simulation and monitoring system for underground coal mines provided in the embodiment of the present application, the mine tunnel simulation unit is a shell structure, and a plurality of groups of monitoring sensors are installed on the top surface of the shell structure along the length direction, and a plurality of reserved interfaces are arranged on the side; the environmental control simulation unit is connected to one end of the mine tunnel simulation unit, and is used to transport the control gas into the shell structure of the mine tunnel simulation unit, so that the airflow in the shell structure of the mine tunnel simulation unit flows to the other end of the shell structure of the mine tunnel simulation unit, so as to adjust the temperature, humidity and wind speed in the shell structure of the mine tunnel simulation unit; in the monitoring gas module In the simulation unit, the coal spontaneous combustion simulation module is used to simulate the spontaneous combustion of coal in the coal mine, and the explosive blasting simulation module is used to simulate the explosion of explosives in the coal mine. The coal spontaneous combustion simulation module and the explosive blasting simulation module are respectively connected to two of the multiple reserved interfaces, so that the gas generated by the spontaneous combustion simulation and the gun smoke generated by the explosion simulation can flow freely into the shell structure of the mine tunnel simulation unit, and flow from one end of the installation environment control simulation unit to the other end in the mine tunnel simulation unit; the vehicle exhaust simulation module is used to simulate the exhaust gas generated by mining vehicles in the process of traveling in the coal mine. The temperature, humidity, wind speed, mixed carbon monoxide concentration and the concentration of characteristic gases generated by the coal spontaneous combustion simulation module, the explosive blasting simulation module and the vehicle exhaust simulation module at different positions in the shell structure of the mine tunnel simulation unit are monitored in real time through multiple sets of monitoring sensors.

[0028] Therefore, through the coordination of the mine tunnel simulation unit, the environmental control simulation unit, and the monitoring gas simulation unit, the simulation of the mine tunnel and its internal environment, multiple carbon monoxide sources, monitoring and other complex environmental changes can be realized, making the simulation environment closer to the actual situation underground in the coal mine, and flexibly realizing the comprehensive simulation of multiple carbon monoxide sources, effectively improving the underground multi-source carbon monoxide The gas detection and analysis capabilities provide strong support for underground coal mine early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. Among them:

[0030] Figure 1 A schematic diagram of the structure of a multi-source carbon monoxide gas simulation and monitoring system for an underground coal mine provided according to some embodiments of the present application;

[0031] Figure 2 Another structural schematic diagram of a multi-source carbon monoxide gas simulation and monitoring system for an underground coal mine provided according to some embodiments of the present application;

[0032] Figure 3 for Figure 2 Partial view at A in the middle;

[0033] Figure 4 for Figure 2 Partial view at B in the middle;

[0034] Figure 5 for Figure 2 Partial view at center C;

[0035] Figure 6 for Figure 2 Partial view at D in the middle;

[0036] Figure 7 A schematic diagram of the assembly of a spiral pipeline according to some embodiments of the present application;

[0037] Figure 8 A schematic diagram of assembling an exhaust gas duct on a drag chain according to some embodiments of the present application.

[0038] Description of reference numerals:

[0039] 100. Mine tunnel simulation unit; 200. Environmental control simulation unit; 300. Monitoring gas simulation unit; 400. Harmful gas treatment device;

[0040] 101. Monitoring sensor;

[0041] 201, variable frequency fan; 202, water tank; 203, reducing pipe; 204, square pipe; 205, guide plate;

[0042] 301. Coal spontaneous combustion simulation module; 302. Explosive blasting simulation module; 303. Vehicle exhaust simulation module; 304. Gas mixing regulator;

[0043] 311. Heating shell; 321. Heating device; 331. Electronic balance; 341. Placement tray; 351. Temperature sensor; 312. Explosion simulation shell; 322. Ignitor; 332. Explosive placement tray; 313. Explosion-proof diesel engine; 323. Exhaust emission simulation trolley; 333. Guide rail; 343. Multi-way valve; 353. Exhaust pipe; 363. Cooling barrel; 373. Spiral pipe; 383. Flow control valve; 393. Drag chain. DETAILED DESCRIPTION

[0044] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application and does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the embodiments of the present invention should belong to the scope of protection of the embodiments of the present invention.

[0045] Normally, carbon monoxide in the air of coal mines The content is extremely low, when carbon monoxide Concentration exceeds the prescribed concentration When carbon monoxide is released, it indicates that spontaneous combustion or other fire may occur in the coal seam, and corresponding measures must be taken immediately. Gas sensor for carbon monoxide Concentration monitoring to achieve early warning of coal spontaneous combustion fires.

[0046] However, field practice shows that spontaneous combustion of coal seams is not caused by carbon monoxide. The only source of toxic and harmful gases (including carbon monoxide) is the explosion and combustion of explosives during blasting operations. ); mining explosion-proof diesel trucks are widely used in underground transportation tasks, and their exhaust gas also contains carbon monoxide . Traditional carbon monoxide Gas sensors can only monitor gas concentrations at fixed locations and cannot effectively identify different sources for monitoring carbon monoxide. The contribution of concentration makes it difficult to directly use the monitoring data for coal spontaneous combustion prediction. Even if the coal does not spontaneously combust, carbon monoxide Sensors monitor carbon monoxide The concentration may also briefly exceed the specified concentration, causing the mine to have to stop production for inspection. Such misjudgment not only increases economic costs but also affects normal production progress.

[0047] Existing research uses the method of building similar simulation devices or conducting numerical simulations to test the gas composition and content generated during coal spontaneous combustion, explosive blasting, and the operation of explosion-proof diesel vehicles, and analyzes the carbon monoxide content under different working conditions. The generation characteristics of gases such as carbon monoxide from different sources are attempted Differentiate and reduce carbon monoxide in the well However, this method of building a similar simulation device or numerical simulation is only for a single carbon monoxide It is impossible to test a single carbon monoxide source with one device at a time. Sources and multiple carbon monoxide In addition, the existing similar simulation devices can only set limited environmental conditions, which makes it difficult to fully simulate the complex environmental changes in coal mines.

[0048] Based on this, the embodiment of the present application provides a multi-source carbon monoxide gas simulation and monitoring system in coal mines, which effectively simulates the complex gas sources and environmental changes in coal mines, improves the multi-source carbon monoxide gas simulation and monitoring system. Gas detection and analysis capabilities. Figures 1 to 7 As shown, the multi-source carbon monoxide gas simulation and monitoring system for underground coal mines includes: a mine tunnel simulation unit 100, an environmental control simulation unit 200 and a monitoring gas simulation unit 300. Among them, the environmental control simulation unit 200 and the monitoring gas simulation unit 300 are both connected to the mine tunnel simulation unit 100, so as to realize the simulation and monitoring of carbon monoxide from multiple sources. Comprehensive simulation of gas mixing conditions.

[0049] In the embodiment of the present application, the mine tunnel simulation unit 100 adopts a shell structure, which can be made of a steel plate or a transparent PC plate, so as to facilitate real-time observation of the experimental conditions inside the tunnel; the tunnel shape and size can be flexibly adjusted according to different simulated tunnels; wherein, the tunnel cross section can be designed in different forms such as trapezoidal, arched, circular, elliptical, etc., to meet the needs of mine tunnels with different cross-sectional shapes. In addition, the mine tunnel simulation unit 100 can form an assembled structure by connecting multiple tunnel sub-units in sequence to simulate mine tunnels of different lengths. At the same time, the modular sub-unit assembly form can effectively improve the efficiency of disassembly, transportation, replacement, etc., and reduce costs.

[0050] In an embodiment of the present application, a plurality of groups of monitoring sensors 101 are installed along the length direction on the top surface of the shell structure of the mine tunnel simulation unit 100, and each group of sensors is arranged at a different monitoring position as required to perform real-time monitoring of the temperature, humidity, gas concentration, wind speed, mixed carbon monoxide concentration, concentration of characteristic gases generated by the coal spontaneous combustion simulation module 301, concentration of characteristic gases generated by the explosive blasting simulation module 302, and concentration of characteristic gases generated by the vehicle exhaust simulation module 303 at different positions within the shell structure of the mine tunnel simulation unit 100.

[0051] Through the environment control simulation unit 200 connected to one end of the mine tunnel simulation unit 100, the control gas is transported into the shell structure of the mine tunnel simulation unit 100, so that the airflow in the shell structure of the mine tunnel simulation unit 100 flows to the other end of the shell structure of the mine tunnel simulation unit 100, so as to adjust the temperature, humidity and wind speed in the shell structure of the mine tunnel simulation unit. Specifically, in the environment control simulation unit 200, the variable frequency fan 201 is located outside the mine tunnel simulation unit 100, and a reducer 203 is installed at the outlet of the variable frequency fan 201; the other end of the reducer 203 is connected to one end of the shell structure of the mine tunnel simulation unit 100 through a square tube 204, and the side wall pipeline of the square tube 204 is connected to the water tank 202, and the temperature of the water in the water tank 202 is adjusted by the temperature control device set in the water tank 202, so that the humid airflow after temperature adjustment enters the square tube 204. Guide plates 205 are installed at both ends of the square tube 204 , and the regulated gas entering the shell structure of the mine tunnel simulation unit 100 is evenly adjusted through the guide plates 205 .

[0052] Thus, under the action of the variable frequency fan 201, the airflow passes through the guide plates 205 at both ends of the square tube 204 for uniform regulation and then enters the shell structure of the mine tunnel simulation unit 100. The water in the water tank 202 can be heated by a heating rod to increase the temperature of the humid airflow entering the square tube 204; the water in the water tank 202 can be cooled by a cooling pump to reduce the temperature of the humid airflow entering the square tube 204. In addition, the airflow temperature in the square tube 204 can be adjusted by connecting a cooling fan to the square tube 204.

[0053] At the same time, a water level monitoring device is installed in the water tank 202. When the water level in the water tank 202 is lower than the safety limit, water is automatically added to the water tank 202 to prevent the water level in the water tank 202 from being too low and causing equipment damage; an airflow regulating valve is installed at the upper airflow outlet of the water tank 202 to adjust the size of the humid airflow entering the square tube 204. For example, when the humidity in the shell structure of the mine tunnel simulation unit 100 is high, the opening of the regulating airflow regulating valve is reduced to reduce the amount of humid airflow entering the shell structure; when the humidity in the shell structure is low, the opening of the regulating airflow regulating valve is increased to increase the amount of humid airflow entering the shell structure.

[0054] In this embodiment, the temperature and humidity in the shell structure are monitored in real time by a monitoring sensor 101 installed in the shell structure, and the monitoring data is transmitted to the programmable logic controller in real time. The programmable logic controller controls the temperature control device (heating rod, cooling pump, etc.) in real time according to the real-time monitoring data, adjusts the power of the temperature control device, and realizes the temperature of the humid air flow entering the shell structure, thereby achieving effective regulation of the temperature and humidity in the shell structure.

[0055] Here, the monitoring sensor 101 can adopt a split-type temperature, humidity, wind speed, gas concentration and other sensors, or a module-integrated monitoring sensor 101 to realize real-time monitoring and transmission of the concentration, temperature, humidity, wind speed, etc. of gases including nitrogen, hydrogen, carbon monoxide, carbon dioxide, nitric oxide, nitrogen dioxide, methane, ethane, ethylene, hydrogen sulfide, etc. in the shell structure, and then analyze the amount of carbon monoxide generated by the coal spontaneous combustion simulation module 301, the explosive blasting simulation module 302 and the vehicle exhaust simulation module 303 respectively through the concentration of characteristic gases generated by the coal spontaneous combustion simulation module 301, the concentration of characteristic gases generated by the explosive blasting simulation module 302 and the concentration of characteristic gases generated by the vehicle exhaust simulation module 303. It should be noted here that the types and contents of characteristic gases generated by coal samples of different components, explosives, and diesel engines with different combustion efficiencies are not the same. When analyzing the carbon monoxide content generated by each module, the type (for example: nitrogen oxides, propylene, hydrogen sulfide, etc.) and content of characteristic gases generated by each coal sample of different components, explosives, and diesel engines with different combustion efficiencies are first determined through separate experiments, and then the content of each component in the mixed gas in the shell structure of the mine tunnel simulation unit 100 is analyzed and calculated in proportion through a component analysis method, and then the carbon monoxide content in different modules such as the coal spontaneous combustion simulation module 301, the explosive blasting simulation module 302, and the vehicle exhaust simulation module 303 is determined.

[0056] In an embodiment of the present application, a plurality of reserved interfaces are provided on the side of the shell structure of the mine tunnel simulation unit 100 for installing the explosive blasting simulation module 302 and the coal spontaneous combustion simulation module 301 in the monitoring gas simulation unit 300; wherein the coal spontaneous combustion simulation module 301 is used to simulate the spontaneous combustion of coal in a coal mine, and the explosive blasting simulation module 302 is used to simulate the explosion of explosives in a coal mine, and the gas generated by the spontaneous combustion simulation and the blasting smoke generated by the explosion simulation flow freely into the shell structure of the mine tunnel simulation unit 100, and flow from one end of the installation environment control simulation unit 200 to the other end in the mine tunnel simulation unit 100.

[0057] At the same time, through multiple reserved interfaces, the positions of the explosive blasting simulation module 302, the coal spontaneous combustion simulation module 301, etc. can be adjusted to simulate the complex environment of different coal mines; in addition, other simulation modules can also be expanded. Furthermore, through modular expansion design, the overall system can have a wider range of applicability, which is convenient for rapid replacement and addition of modules, effectively improving the flexibility of the experiment and making the experimental environment more suitable for the actual underground coal mines.

[0058] In a specific example, the coal spontaneous combustion simulation module 301 and the explosive blasting simulation module 302 are respectively connected to the reserved interface on the shell structure of the mine tunnel simulation unit 100 through the second gas pipeline; or, the coal spontaneous combustion simulation module 301 and the explosive blasting simulation module 302 are directly connected to the two reserved interfaces in a one-to-one correspondence. For the reserved interface on the shell structure where no simulation module is set, it is sealed by a sealing cover plate to effectively prevent gas leakage in the shell structure.

[0059] In addition, different preset concentrations of oxygen are introduced into the coal spontaneous combustion simulation module 301 and the explosive blasting simulation module 302 through the gas mixing regulator 304, so as to effectively promote the spontaneous combustion simulation and explosion simulation in the coal spontaneous combustion simulation module 301 and the explosive blasting simulation module 302. Specifically, the air inlet of the gas mixing regulator 304 is connected to multiple gas cylinders filled with different gases, and the gas mixing regulator 304 has multiple air outlets, which are respectively connected to the coal spontaneous combustion simulation module 301 and the explosive blasting simulation module 302, so as to respectively introduce a mixed gas with a first preset oxygen concentration into the coal spontaneous combustion simulation module 301, and introduce a mixed gas with a second preset oxygen concentration into the explosive blasting simulation module 302. At the same time, an air flow meter is also provided at the air outlet of the gas mixing regulator 304, and the flow rate of the mixed gas entering the coal spontaneous combustion simulation module 301 and the explosive blasting simulation module 302 is effectively controlled by the gas flow meter.

[0060] In a specific example, the coal spontaneous combustion simulation module 301 includes at least a heating shell 311, a heating device 321, an electronic balance 331, a placement tray 341 and a temperature sensor 351. The heating shell 311 is a shell structure with a gas circulation interface on the side, and the gas circulation interface is adapted to communicate with one of the reserved interfaces on the shell structure of the mine tunnel simulation unit 100, and is fixed by a flange connection; a placement tray 341 is arranged in the heating shell 311, and the placement tray 341 adopts a barrel structure with an upper end opening, and an air distribution plate is arranged at the bottom of the barrel structure, and a plurality of gas through holes are arranged on the air distribution plate to ensure that the heated mixed gas flows evenly from the bottom to the top through the coal sample; the diameter of the gas through hole is smaller than the particle size of the coal sample evenly laid in the placement tray 341, so as to effectively prevent coal particles from falling during the experiment.

[0061] A heating device 321 with a cylindrical shell structure is arranged below the tray 341, and the temperature and heating rate of the coal sample are accurately controlled by the heating device 321 (for example, an electric heating wire). Specifically, the upper layer of the heating device 321 is a multilayer resistance wire wrapped with a temperature-resistant material, and the coal sample in the tray 341 is heated and heated by the multilayer resistance wire; the lower layer of the heating device 321 is a heat-insulating material, and a hollow cavity is formed between the multilayer resistance wire of the upper layer and the heat-insulating material of the lower layer. On the heating device 321, a heating gas inlet connected to the hollow cavity is arranged radially, and the heating gas inlet is connected to one of the multiple outlets of the gas mixing regulator 304, so that the first preset oxygen concentration mixed gas enters the hollow cavity through the heating gas inlet; the upper layer of the heating device 321 is provided with a heating gas outlet connected to the hollow cavity along the axial direction, and the mixed gas preheated by the multilayer resistance wire is uniformly flowed through the coal sample through the multiple gas through holes on the air distribution plate through the heating gas outlet.

[0062] An electronic balance 331 is arranged below the heating device 321, and the mass change of the coal sample during the heating process is monitored in real time by the electronic balance 331; at the same time, two temperature sensors 351 are installed on the top plate of the heating shell 311, wherein the temperature probe of one temperature sensor 351 extends axially into the heating shell 311 and is inserted into the coal sample, so as to monitor the internal temperature of the coal sample during spontaneous combustion in real time; the temperature probe of the other temperature sensor 351 extends axially into the heating shell 311 and is located above the coal sample, so as to monitor the ambient temperature of the coal sample during spontaneous combustion in real time.

[0063] In another specific example, the explosive blasting simulation module 302 at least includes an explosion simulation shell 312, an igniter 322 and an explosive placement plate 332. Among them, the side wall of the explosion simulation shell 312 is provided with a blasting smoke circulation interface, which is adapted and communicated with one of the multiple reserved interfaces on the mine tunnel simulation unit 100, and is fixed by a flange connection to connect the explosion simulation shell 312 with the shell structure of the mine tunnel simulation unit 100; a mixed gas interface is provided on the bottom plate of the explosion simulation shell 312, and the mixed gas interface is connected to one of the multiple gas outlets of the gas mixing regulator 304, and the amount of the mixed gas with a second preset oxygen concentration entering the explosion simulation shell 312 from the gas outlet of the gas mixing regulator 304 is regulated by a gas flow meter.

[0064] An explosive placement tray 332 is placed inside the explosion simulation shell 312, and explosives for blasting simulation are placed on the explosive placement tray 332; an igniter 322 for detonating the blasting simulation explosives is installed on the top plate of the explosion simulation shell 312; wherein the igniter 322 is screwed tightly on the top plate of the explosion simulation shell 312, and the depth of the igniter 322 extending into the explosion simulation shell 312 is adjusted by rotating the igniter 322 to adapt to different amounts of explosives placed on the explosive placement tray 332, and release gun smoke by simulating explosive blasting. Here, other disaster scenes (such as transportation fires, electrical equipment fires, etc.) can also be simulated by replacing the simulated raw materials on the explosive placement tray 332.

[0065] In the embodiment of the present application, the monitoring gas simulation unit 300 also includes a vehicle exhaust simulation module 303, which simulates the exhaust gas generated by the mining vehicle during its travel in the coal mine through an external explosion-proof diesel engine 313. Specifically, the explosion-proof diesel engine 313 is located outside the mine tunnel simulation unit 100, and is connected to the exhaust gas discharge port set in the shell structure of the mine tunnel simulation unit 100 through the exhaust gas pipeline, so as to discharge the generated combustion exhaust gas through the exhaust gas discharge port in the shell structure of the mine tunnel simulation unit 100. Among them, the exhaust gas discharge port is located in the mine tunnel simulation unit 100 and can move along the length direction of the shell structure of the mine tunnel simulation unit 100, thereby simulating the exhaust gas generated by the mining vehicle during its travel in the coal mine.

[0066] Specifically, a guide rail 333 is arranged along the length direction in the mine tunnel simulation unit 100, and an exhaust gas emission simulation trolley 323 is placed on the guide rail 333 to enable the exhaust gas emission simulation trolley 323 to move along a fixed path; a drag chain 393 is arranged in parallel next to the guide rail 333, and the drag chain 393 is connected to the exhaust gas emission simulation trolley 323, so that the exhaust gas emission simulation trolley 323 can move in a directional manner on the guide rail 333 to drive the movement of the drag chain 393, and then the exhaust gas emission port fixed on the drag chain 393 moves together with the drag chain 393. In addition, the exhaust gas discharge port is arranged on the drag chain 393 and arranged side by side with the exhaust gas emission simulation trolley 323. Specifically, the interior of the drag chain 393 is a hollow structure, and the exhaust gas pipeline is arranged in the hollow structure of the drag chain 393. When the exhaust gas emission simulation trolley 323 drives the drag chain 393 forward, the drag chain 393 will automatically unfold, and the exhaust gas pipeline arranged in the hollow structure of the drag chain 393 will automatically unfold. On the contrary, when the drag chain 393 retreats, the exhaust gas pipeline will automatically fold. In addition, the outflow direction of the airflow from the exhaust gas discharge port is opposite to the movement direction of the exhaust gas emission simulation trolley 323, so that the exhaust gas emission simulation trolley 323 drives the drag chain 393 and the exhaust gas discharge port to move in the same direction at the same time, so as to effectively simulate the generation of exhaust gas by the mining vehicle in the process of walking in the coal mine. In addition, the exhaust gas emission height of the mining vehicle can be further simulated by adjusting the height of the exhaust gas discharge port.

[0067] In a specific example, there are two exhaust emission simulation carts 323, and the two exhaust emission simulation carts 323 are respectively driven towards each other from the two ends of the mine tunnel simulation unit 100, and the two exhaust emission simulation carts 323 are independently controlled to simulate various operating modes and speeds of mining vehicles, including the vehicle moving with the wind or against the wind when a single vehicle is working, the vehicle idling, and the two vehicles moving towards each other when two vehicles are working, idling at the same time, one vehicle moving and the other idling, etc., to simulate exhaust emissions under different production scenarios.

[0068] There are two exhaust gas emission ports corresponding to the two exhaust gas emission simulation carts 323. The two exhaust gas emission ports move with the two exhaust gas emission simulation carts 323 respectively, and independent gas flow meters are arranged on the connecting pipes connected to the two exhaust gas emission ports to independently control the exhaust gas flow rate emitted by each exhaust gas emission simulation cart 323.

[0069] In this embodiment, the exhaust pipe of the explosion-proof diesel engine 313 is connected to a four-way valve (multi-way valve 343) to transport the combustion exhaust gas to two exhaust gas discharge ports corresponding to the two exhaust gas emission simulation vehicles 323, and flow control valves 383 are respectively provided on the connecting pipes of the two exhaust gas discharge ports to individually control the combustion exhaust gas emission corresponding to each exhaust gas emission simulation vehicle 323. The remaining pipe of the four-way valve (without the flow control valve 383) is connected to the harmful gas treatment device 400 through a gas pipe to perform harmless treatment on the excess combustion exhaust gas discharged by the explosion-proof diesel engine 313.

[0070] Among them, the multi-way valve 343 and the tail gas pipeline 353 are connected by a spiral pipeline 373, and the spiral pipeline 373 is located in a cooling barrel 363 containing a cooling medium (liquid medium or gas medium, etc.); further, the combustion exhaust gas discharged by the explosion-proof diesel engine 313 is cooled in the cooling barrel 363 through the spiral pipeline 373, so that the air flow in the pipeline is more stable, effectively solving the problem that the flow regulating valve 383 may be damaged due to high temperature when the tail gas pipeline 353 is directly connected to the multi-way valve 343, avoiding the loss caused by the instability of the high-temperature tail gas generated by the explosion-proof diesel engine 313, and improving the success rate of the experiment. At the same time, the harmful gas treatment device 400 can also be connected to the other end of the shell structure of the mine tunnel simulation unit 100 to purify the exhaust gas generated by coal spontaneous combustion, explosive blasting, and the combustion tail gas of the explosion-proof diesel engine.

[0071] Among them, the harmful gas treatment device 400 is mainly composed of a small electrostatic dust removal device and a double-layer fireproof thickened smoke exhaust hose. The tunnel, the electrostatic dust removal device and the external environment are connected through the double-layer fireproof thickened smoke exhaust hose, so that the treated flue gas is discharged to the external environment. The electrostatic dust removal device includes an electrostatic precipitator body system, a high-voltage power supply system and a low-voltage automatic control system. During operation, the smoke dust in the flue gas is charged and separated from the flue gas under the action of the high-voltage electric field. During the experiment, this device can adsorb the smoke dust with a particle size range of 0.01-50μm produced by the combustion of combustibles, thereby reducing the pollution of the product to the air during the experiment.

[0072] Thus, by setting up the mine tunnel simulation unit 100, the environmental control simulation unit 200, and the monitoring gas simulation unit 300, the simulation of the mine tunnel and its internal environment, multiple carbon monoxide sources, monitoring and other complex environmental changes can be realized, so that the simulation environment is closer to the actual situation underground in the coal mine, and the comprehensive simulation of the working conditions of multiple carbon monoxide sources can be flexibly realized, which effectively improves the underground multi-source carbon monoxide. The gas detection and analysis capabilities provide strong support for underground coal mine early warning.

[0073] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0077] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0078] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-source carbon monoxide gas simulation and monitoring system for underground coal mines, characterized in that: include: The mine tunnel simulation unit is a shell structure, wherein a plurality of monitoring sensors are installed on the top surface of the shell structure along the length direction, and a plurality of reserved interfaces are arranged on the side surface; An environmental control simulation unit is connected to one end of the mine tunnel simulation unit and is used to deliver control gas into the shell structure of the mine tunnel simulation unit so that the airflow in the shell structure of the mine tunnel simulation unit flows to the other end of the shell structure of the mine tunnel simulation unit to adjust the temperature, humidity and wind speed in the shell structure of the mine tunnel simulation unit; The monitoring gas simulation unit includes: a coal spontaneous combustion simulation module, an explosive blasting simulation module and a vehicle exhaust simulation module; the coal spontaneous combustion simulation module is used to simulate the spontaneous combustion of coal in the coal mine, and the explosive blasting simulation module is used to simulate the explosion of explosives in the coal mine, and the coal spontaneous combustion simulation module and the explosive blasting simulation module are respectively connected to two of the plurality of reserved interfaces, so that the gas generated by the spontaneous combustion simulation and the blasting smoke generated by the explosion simulation can flow freely into the shell structure of the mine tunnel simulation unit, and flow from one end where the environmental control simulation unit is installed to the other end in the mine tunnel simulation unit; The vehicle exhaust simulation module is used to simulate the exhaust emissions generated by mining vehicles when they are traveling underground in the coal mine; Among them, multiple groups of monitoring sensors are used to monitor the temperature, humidity, first gas concentration, second gas concentration, third gas concentration, mixed carbon monoxide concentration and wind speed at different positions in the shell structure of the mine tunnel simulation unit in real time, so as to perform proportional analysis and calculation on the content of each component in the mixed gas in the shell structure through the types and contents of different characteristic gases determined in advance, and obtain the carbon monoxide content generated in the coal spontaneous combustion simulation module, the explosive blasting simulation module and the vehicle exhaust simulation module; the first gas concentration, the second gas concentration and the third gas concentration are the concentrations of characteristic gases generated by the coal spontaneous combustion simulation module, the explosive blasting simulation module and the vehicle exhaust simulation module respectively.

2. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 1, characterized in that: The environmental control simulation unit includes: a variable frequency fan, a water tank and a guide plate; The variable frequency fan is located outside the mine tunnel simulation unit, and a reducer is installed at the outlet of the variable frequency fan. The other end of the reducer is connected to one end of the shell structure of the mine tunnel simulation unit through a square tube; the side wall of the square tube is connected to the water tank. Among them, the guide plates are installed at both ends of the square tube, and the guide plates are used to evenly adjust the regulated gas entering the shell structure of the mine tunnel simulation unit, and multiple temperature control devices are installed in the water tank to adjust the temperature and humidity of the regulated gas.

3. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 1, characterized in that: The coal spontaneous combustion simulation module and the explosive blasting simulation module are respectively connected to the reserved interface on the shell structure of the mine tunnel simulation unit through the second gas pipeline; or, The coal spontaneous combustion simulation module and the explosive blasting simulation module are directly connected to the reserved interfaces respectively.

4. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 1, characterized in that: Also includes: Gas mixing regulator, The gas inlet of the gas mixing regulator is connected to multiple gas cylinders filled with different gases, and the gas mixing regulator has multiple gas outlets, and the multiple gas outlets are respectively connected to the coal spontaneous combustion simulation module and the explosive blasting simulation module, so as to respectively introduce a mixed gas with a first preset oxygen concentration into the coal spontaneous combustion simulation module and introduce a mixed gas with a second preset oxygen concentration into the explosive blasting simulation module.

5. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 4, characterized in that: The coal spontaneous combustion simulation module comprises: a heating shell, a heating device, an electronic balance, a placement tray and a temperature sensor; The heating shell is a shell structure with a gas circulation interface provided on the side, and the gas circulation interface is adapted to communicate with one of the plurality of reserved interfaces; The placement tray is located in the heating shell and is a barrel structure with an upper end opening, and an air distribution plate is provided at the bottom of the barrel structure, and a plurality of gas through holes are arranged on the air distribution plate; the coal sample is evenly laid in the placement tray; wherein the diameter of the gas through hole is smaller than the particle size of the coal sample; The heating device is located below the placement tray and is a cylindrical shell structure. The upper layer is a multi-layer resistance wire wrapped by a temperature-resistant material, and the lower layer is a heat-insulating material. A hollow cavity is formed between the upper multi-layer resistance wire and the lower heat-insulating material, and a heating gas inlet connected to the hollow cavity is radially arranged on the heating device, and a heating gas outlet connected to the hollow cavity is axially arranged on the upper layer of the heating device; wherein the multi-layer resistance wire is used to heat and increase the temperature of the coal sample in the placement tray; the heating gas inlet is connected to one of the multiple outlets of the gas mixing regulator, and the heating gas outlet is used to uniformly flow the mixed gas preheated by the multi-layer resistance wire through the multiple gas through holes on the air distribution plate through the coal sample; The electronic balance is located below the heating device and is used to monitor the mass change of the coal sample in real time during the heating process; There are two temperature sensors, both of which are installed on the top plate of the heating shell. The temperature probe of one of the temperature sensors extends axially into the heating shell and is inserted into the coal sample, so as to monitor the internal temperature of the coal sample in real time during spontaneous combustion; the temperature probe of the other temperature sensor extends axially into the heating shell and is located above the coal sample, so as to monitor the ambient temperature of the coal sample in real time during spontaneous combustion.

6. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 4, characterized in that: The explosive blasting simulation module comprises: an explosion simulation shell, an igniter and an explosive placement plate; The explosion simulation shell is provided with a gun smoke circulation interface and a mixed gas interface, the gun smoke circulation interface is located on the side wall of the explosion simulation shell, and is adapted to communicate with one of the multiple reserved interfaces, and the mixed gas interface is located on the bottom plate of the explosion simulation shell, and is connected to one of the multiple gas outlets of the gas mixing regulator; The explosive placement plate is located inside the explosion simulation shell and is used to place blasting simulation explosives; The igniter is installed on the top plate of the explosion simulation shell and is used to detonate the blasting simulation explosive; wherein the igniter is screwed on the top plate of the explosion simulation shell to adjust the depth of the igniter extending into the explosion simulation shell.

7. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 1, characterized in that: The vehicle exhaust simulation module includes: an explosion-proof diesel engine and an exhaust emission simulation car. The explosion-proof diesel engine is located outside the mine tunnel simulation unit and is connected to an exhaust gas discharge port provided in the shell structure of the mine tunnel simulation unit through an exhaust gas pipeline, so as to discharge the generated combustion exhaust gas through the exhaust gas discharge port in the shell structure of the mine tunnel simulation unit; The exhaust gas emission simulation trolley is located in the mine tunnel simulation unit and can move along the length direction in the shell structure of the mine tunnel simulation unit; wherein the exhaust gas emission port moves with the exhaust gas emission simulation trolley to simulate the emission of exhaust gas generated by the mining vehicle during its travel underground in the coal mine.

8. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 7, characterized in that: A guide track is arranged in the mine tunnel simulation unit along the length direction, and the exhaust emission simulation trolley is placed on the guide track so that the exhaust emission simulation trolley travels along a fixed path.

9. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 7, characterized in that: There are two exhaust emission simulation vehicles, and the two exhaust emission simulation vehicles are respectively driven towards each other from two ends of the mine tunnel simulation unit; Correspondingly, There are two exhaust gas emission ports, which are matched with the two exhaust gas emission simulation vehicles respectively and move with the two exhaust gas emission simulation vehicles respectively; wherein an independent gas flow meter is arranged on the connecting pipe connected to the two exhaust gas emission ports to independently control the exhaust gas flow rate emitted by each exhaust gas emission simulation vehicle.

10. The multi-source carbon monoxide gas simulation and monitoring system for underground coal mines according to claim 9, characterized in that: Also includes: A harmful gas treatment device, connected to the exhaust pipe of the explosion-proof diesel engine through a multi-way valve, for harmlessly treating the excess exhaust gas generated by the explosion-proof diesel engine; A cooling barrel is also provided between the multi-way valve and the exhaust pipe of the explosion-proof diesel engine. The multi-way valve and the exhaust pipe are connected by a spiral pipe, and the spiral pipe is located in the cooling barrel filled with a cooling medium to cool the combustion exhaust gas emitted by the explosion-proof diesel engine.

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