Coal mine underground spontaneous combustion detection and fire extinguishing device

Abstract

The utility model relates to the technical field of mine safety, and discloses an underground coal mine spontaneous combustion detection and fire extinguishing device. The coal mine underground spontaneous combustion and ignition detection and fire extinguishing device comprises a shell, a partition plate is fixedly installed in the shell, a logic controller is fixedly installed above the partition plate, a branch pipe is installed above the partition plate in a penetrating and inserting mode, an electromagnetic valve is fixedly installed at the lower end of the branch pipe, an exhaust pipe is fixedly installed below the electromagnetic valve, and the exhaust pipe is fixedly connected with the logic controller. After the air pump is started, nitrogen is conveyed into the branch pipe from the air inlet pipe, the lower portion of the branch pipe is connected with the electromagnetic valve, and the passing ability of the electromagnetic valve is smaller than that of the nitrogen conveying pipeline, so that the air pressure in the nitrogen conveying pipeline on the rear side of the fire extinguishing device is gradually increased; in this way, certain air pressure can be kept in the nitrogen conveying pipeline between the fire extinguishing devices on the two sides of the fire point, and therefore the situation that the nitrogen blocking efficiency is affected due to small nitrogen flow caused by insufficient air pressure in the pipeline at the rear end is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mine safety, in particular to a spontaneous combustion detection and fire extinguishing device in an underground coal mine. Background Art

[0002] Coal spontaneous combustion can not only produce a large amount of toxic and harmful gases, but also easily cause thermal disasters such as gas explosions. In the early stages of coal spontaneous combustion, it does not produce a lot of smoke and obvious flames, but it can produce a large amount of toxic and harmful gases, posing a huge threat to the lives of workers underground in coal mines. Coal mines are prone to accumulate a large amount of flammable and explosive gases during the mining process. The coal body is prone to detonate flammable and explosive gases during spontaneous combustion. After the gas is detonated, coal dust accumulates in a relatively closed space. Under the action of the ignition source, it is easy to cause a coal dust explosion.

[0003] The existing referenceable Chinese utility model patent with announcement number: CN215949361U discloses a monitoring and fire-extinguishing device for preventing spontaneous combustion of coal seams in underground coal mine drilling, including: an orifice insert, an orifice water injection pipe, a slag discharge pipe, an exhaust pipe, a visualization device, a first CO monitoring device and a second CO monitoring device. The orifice insert is used to be sealed and inserted in the borehole, and the orifice water injection pipe, the slag discharge pipe and the exhaust pipe are all connected to the side wall of the orifice insert, and when in use, the orifice water injection pipe, the slag discharge pipe and the exhaust pipe are located outside the borehole. The visualization device is connected to the exhaust pipe, and the dust in the exhaust air can be observed through the visualization device. The first CO monitoring device is arranged at a position outside the borehole near the borehole to monitor the CO leaking from the borehole. The second CO monitoring device is arranged in the tube cavity of the exhaust pipe at the gas outlet end. The monitoring and fire-extinguishing device for preventing spontaneous combustion of the utility model can timely detect the change of CO concentration in the borehole, and timely extinguish the fire, thereby reducing the harm of harmful gases to on-site construction personnel.

[0004] Existing detection fire extinguishing devices are generally connected in series through nitrogen pipelines, so that when a fire extinguishing device at a certain place in the mine detects that the carbon monoxide concentration is too high, the fire extinguishing device will allow the nitrogen in the pipeline to enter the mine, so that a section of the mine is filled with nitrogen, thereby isolating oxygen, so that the coal mine is extinguished without combustion-supporting gas. Since nitrogen needs to be introduced on both sides before and after the spontaneous combustion point to isolate the oxygen inside the tunnels on both sides of the spontaneous combustion point, this method turns on a fire extinguishing device at one place, and the air pressure inside the lower pipeline is reduced, resulting in a decrease in the nitrogen flow rate of the lower fire extinguishing device, affecting the blocking efficiency. At the same time, most of the existing detection fire extinguishing devices only monitor whether spontaneous combustion occurs in coal mines through the carbon monoxide content. Since natural oxidation of coal mines will produce carbon monoxide, this method has low reliability. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the utility model provides a spontaneous combustion detection and extinguishing device for underground coal mines, which has the advantages of reliable monitoring and the ability to maintain a stable air pressure inside the nitrogen pipeline, thereby solving the above-mentioned technical problems.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a spontaneous combustion detection and fire extinguishing device in a coal mine, comprising: a shell, a partition is fixedly installed inside the shell, a logic controller is fixedly installed above the partition, a branch pipe is inserted above the partition, a solenoid valve is fixedly installed at the lower end of the branch pipe, an exhaust pipe is fixedly installed below the solenoid valve, an air pump is fixedly installed at the front end of the branch pipe, an intake pipe is fixedly installed at the front end of the air pump, a wiring harness is fixedly installed inside the shell, a gas pipe is fixedly installed inside the wiring harness, a detection tube is fixedly installed below the gas pipe, a fixing frame is fixedly installed inside the detection tube, a carbon monoxide sensor and an ethylene sensor are fixedly installed inside the fixing frame; the solenoid valve can close the lower end opening of the branch pipe.

[0009] As an optimal technical solution of the utility model, a top cover is movably installed on the top of the shell, connecting plates are fixedly installed on the left and right sides of the shell, a limiting ring is fixedly installed on the outside of the air pump, and a fixing plate is fixedly installed on the left end of the air pump; the shell can protect the air pump.

[0010] As the preferred technical solution of the utility model, the top cover is movably connected to the outer shell by bolts, and the connected plates are installed on the left and right sides of the outer shell in a mirror-symmetrical manner and front-to-back symmetrical manner with the center of the outer shell as a reference, and the bottom ends of the limit ring and the fixing plate are fixedly connected to the outer shell; the top cover can close the top end of the outer shell.

[0011] As a preferred technical solution of the utility model, the branch pipe is fixedly connected to the shell through a partition, and the rear end of the branch pipe transversely penetrates the rear wall of the shell from front to back; the branch pipe can facilitate nitrogen to enter the exhaust pipe.

[0012] As a preferred technical solution of the utility model, the air intake pipe is connected to the branch pipe through an air pump, the air intake pipe penetrates the front wall of the shell horizontally from front to back, and the exhaust pipe penetrates the bottom surface of the shell; the air intake pipe can facilitate nitrogen to enter the air pump.

[0013] As a preferred technical solution of the utility model, the detection tube is connected to the gas pipe, and the fixing frame is symmetrically installed on the upper and lower sides of the detection tube with the center of the detection tube as a reference; the detection tube can limit the gas flow direction.

[0014] As a preferred technical solution of the utility model, the carbon monoxide sensor is fixedly installed at the center of the fixing frame above the detection tube, and the ethylene sensor is fixedly installed at the center of the fixing frame below the detection tube; the fixing frame can fix the carbon monoxide sensor and the ethylene sensor.

[0015] Compared with the prior art, the utility model provides a spontaneous combustion detection and extinguishing device for underground coal mines, which has the following beneficial effects:

[0016] 1. The utility model provides an ethylene sensor. In the adsorbed gas of coal, there is no CH gas component. When the coal temperature reaches 108.8°C during the heating and oxidation process of coal, CH (ethylene) is generated, and ethane (CH) and propane (CH) and other gases are generated at the same time, indicating that a high temperature point above 108.8°C exists. Through the setting of the gas pipeline, one end of the gas pipeline is located at the opening at the lower end of the harness pipe, and the other end is connected to the gas detection equipment outside the mine. At the same time, a detection tube is connected to the bottom of the gas pipeline. When the gas passes through the detection tube, the carbon monoxide sensor can detect the carbon monoxide content of the gas, and the ethylene sensor can detect whether there is ethylene in the gas. The logic controller performs logical operations on the monitoring data of the carbon monoxide sensor and the ethylene sensor, and controls the opening of the solenoid valve according to the operation results so that nitrogen enters the mine from the pipeline. This method can improve the reliability of the device.

[0017] 2. The utility model sets an air pump. After the logic controller determines that coal spontaneous combustion has occurred based on the monitoring data of the carbon monoxide sensor and the ethylene sensor, the logic controller will start the air pump. After the air pump is started, nitrogen will be transported from the air intake pipe to the inside of the branch pipe. Since the branch pipe is connected to the solenoid valve at the bottom, the permeability of the solenoid valve is smaller than that of the nitrogen delivery pipe, which will gradually increase the internal air pressure of the nitrogen delivery pipe on the rear side of the fire extinguishing device. In this way, the internal air pressure of the nitrogen delivery pipe between the fire extinguishing devices on both sides of the fire point can be maintained at a certain pressure, thereby avoiding a small nitrogen flow rate at the rear end due to insufficient air pressure in the pipeline, which affects the nitrogen plugging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the shell of the utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the wiring harness tube of the utility model;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the detection tube of the utility model;

[0022] Among them: 1. Shell; 11. Top cover; 12. Connecting plate; 13. Partition; 14. Logic controller; 15. Branch pipe; 16. Solenoid valve; 17. Exhaust pipe; 18. Air pump; 19. Intake pipe; 110. Wiring pipe; 111. Gas pipe; 112. Detection tube; 113. Fixing bracket; 114. Carbon monoxide sensor; 115. Ethylene sensor; 116. Limiting ring; 117. Fixing plate. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0024] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1 - Figure 4In the present embodiment, a spontaneous combustion fire detection and extinguishing device in a coal mine comprises: a shell 1, a partition 13 is fixedly installed inside the shell 1, a logic controller 14 is fixedly installed above the partition 13, a branch pipe 15 is inserted above the partition 13, a solenoid valve 16 is fixedly installed at the lower end of the branch pipe 15, an exhaust pipe 17 is fixedly installed below the solenoid valve 16, an air pump 18 is fixedly installed at the front end of the branch pipe 15, an air intake pipe 19 is fixedly installed at the front end of the air pump 18, a wiring harness pipe 110 is fixedly installed inside the shell 1, a gas supply pipe 111 is fixedly installed inside the wiring harness pipe 110, a detection pipe 112 is fixedly installed below the gas supply pipe 111, a fixing frame 113 is fixedly installed inside the detection pipe 112, and a carbon monoxide sensor 114 and an ethylene sensor 115 are fixedly installed inside the fixing frame 113.

[0027] A top cover 11 is movably mounted on the upper part of the housing 1 , connecting plates 12 are fixedly mounted on the left and right sides of the housing 1 , a limiting ring 116 is fixedly mounted on the outer side of the air pump 18 , and a fixing plate 117 is fixedly mounted on the left end of the air pump 18 .

[0028] The top cover 11 is movably connected to the outer shell 1 by bolts, and the connected plate 12 is installed on the left and right sides of the outer shell 1 with left-right mirror symmetry and front-back symmetry based on the center of the outer shell 1. The bottom ends of the limit ring 116 and the fixing plate 117 are fixedly connected to the outer shell 1.

[0029] The branch pipe 15 is fixedly connected to the outer shell 1 through the partition plate 13 , and the rear end of the branch pipe 15 transversely penetrates the rear wall of the outer shell 1 in a front-to-back direction.

[0030] The air inlet pipe 19 is connected to the branch pipe 15 through the air pump 18 . The air inlet pipe 19 penetrates the front wall of the housing 1 transversely from front to back, and the exhaust pipe 17 penetrates the bottom surface of the housing 1 .

[0031] The detection tube 112 is connected to the gas delivery tube 111 , and the fixing frame 113 is installed symmetrically on the upper and lower sides of the detection tube 112 with the center of the detection tube 112 as a reference.

[0032] The carbon monoxide sensor 114 is fixedly installed at the center of the fixing frame 113 above the detection tube 112 , and the ethylene sensor 115 is fixedly installed at the center of the fixing frame 113 below the detection tube 112 .

[0033] Specifically, the shell 1 can protect the air pump 18, the top cover 11 can close the top of the shell 1, the connecting plate 12 can facilitate the fixing of the shell 1 to the roof of the mine, the partition 13 can support the logic controller 14, the model of the logic controller 14 is FX5U, the logic controller 14 can control the switch of the solenoid valve 16, the branch pipe 15 can facilitate the nitrogen to enter the exhaust pipe 17, the solenoid valve 16 can close the lower end opening of the branch pipe 15, the exhaust pipe 17 can facilitate the nitrogen to enter the tunnel, and the air pump 18 can increase the gas flow rate. The air pipe 19 can facilitate the entry of nitrogen into the air pump 18, the wiring harness tube 110 can facilitate limiting the position of the gas pipe 111, the gas pipe 111 can transport gas samples to the gas detection equipment outside the mine, the detection tube 112 can limit the direction of gas flow, the fixing frame 113 can fix the carbon monoxide sensor 114 and the ethylene sensor 115. The model of the carbon monoxide sensor 114 is ACM3000, and the model of the ethylene sensor 115 is ME3-C2H4. The limit ring 116 and the fixing plate 117 can fix the air pump 18.

[0034] When in use, it is necessary to install it every fifty meters underground, and connect the air intake pipe 19 of the corresponding equipment with the branch pipe 15 end to end, and limit the position of the gas pipe 111 through the harness pipe 110. The end of the gas pipe 111 needs to be connected to the gas monitoring equipment outside the mine through an electromagnetic valve. There is no C2H4 gas component in the adsorbed gas of the coal. When the coal temperature reaches 108.8°C during the heating and oxidation process of the coal, C2H4 (ethylene) is produced, and ethane (C2H6), propane (C3H8) and other gases are also produced, indicating that a high temperature point above 108.8°C exists. Through the setting of the gas pipe 111, one end of the gas pipe 111 is located at the opening at the lower end of the harness pipe 110, and the other end is connected to the gas detection equipment outside the mine. At the same time, a detection pipe 112 is connected to the bottom of the gas pipe 111. When the gas passes through the detection pipe 112, the carbon monoxide sensor 114 can detect the carbon monoxide content of the gas, and the ethylene sensor 115 can detect the gas Whether there is ethylene in the coal, the logic controller 14 will perform logical operations on the monitoring data of the carbon monoxide sensor 114 and the ethylene sensor 115, and control the opening of the solenoid valve 16 according to the operation result to allow nitrogen to enter the mine from the pipeline. This method can improve the reliability of the device. After the logic controller 14 obtains the coal spontaneous combustion phenomenon based on the monitoring data of the carbon monoxide sensor 114 and the ethylene sensor 115, the logic controller 14 will start the air pump 18. After the air pump 18 is started, it will transport nitrogen from the air intake pipe 19 to the inside of the branch pipe 15. Since the branch pipe 15 is connected to the solenoid valve 16 at the bottom, the permeability of the solenoid valve 16 is smaller than that of the nitrogen delivery pipeline, which will gradually increase the internal air pressure of the nitrogen delivery pipeline on the rear side of the fire extinguishing device. This method can maintain a certain air pressure inside the nitrogen delivery pipeline between the fire extinguishing devices on both sides of the fire point, thereby avoiding a small nitrogen flow rate at the rear end due to insufficient air pressure in the pipeline, affecting the nitrogen plugging efficiency.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spontaneous combustion detection and extinguishing device for underground coal mines, characterized in that: include: A housing (1), a partition (13) is fixedly installed inside the housing (1), a logic controller (14) is fixedly installed above the partition (13), a branch pipe (15) is inserted above the partition (13), a solenoid valve (16) is fixedly installed at the lower end of the branch pipe (15), an exhaust pipe (17) is fixedly installed below the solenoid valve (16), an air pump (18) is fixedly installed at the front end of the branch pipe (15), and the air pump (18) An air intake pipe (19) is fixedly installed at the front end, a wiring harness pipe (110) is fixedly installed inside the housing (1), a gas supply pipe (111) is fixedly installed inside the wiring harness pipe (110), a detection pipe (112) is fixedly installed below the gas supply pipe (111), a fixing frame (113) is fixedly installed inside the detection pipe (112), and a carbon monoxide sensor (114) and an ethylene sensor (115) are fixedly installed inside the fixing frame (113).

2. A spontaneous combustion detection and extinguishing device for underground coal mines according to claim 1, characterized in that: A top cover (11) is movably mounted above the housing (1), connecting plates (12) are fixedly mounted on the left and right sides of the housing (1), a limiting ring (116) is fixedly mounted on the outer side of the air pump (18), and a fixing plate (117) is fixedly mounted on the left end of the air pump (18).

3. A spontaneous combustion detection and extinguishing device for underground coal mines according to claim 2, characterized in that: The top cover (11) is movably connected to the outer shell (1) by bolts, and the connecting plate (12) is installed on the left and right sides of the outer shell (1) in a mirror-symmetrical manner and front-to-back symmetrical manner with the center of the outer shell (1) as a reference, and the bottom ends of the limiting ring (116) and the fixing plate (117) are fixedly connected to the outer shell (1).

4. The spontaneous combustion detection and extinguishing device for underground coal mines according to claim 1 is characterized in that: The branch pipe (15) is fixedly connected to the outer shell (1) via the partition plate (13), and the rear end of the branch pipe (15) transversely penetrates the rear side vertical wall of the outer shell (1) from front to back.

5. The spontaneous combustion detection and extinguishing device for underground coal mines according to claim 1, characterized in that: The air intake pipe (19) is connected to the branch pipe (15) through the air pump (18), and the air intake pipe (19) penetrates the front side vertical wall of the shell (1) transversely from front to back, and the exhaust pipe (17) penetrates the bottom surface of the shell (1).

6. The spontaneous combustion detection and extinguishing device for underground coal mines according to claim 1, characterized in that: The detection tube (112) is connected to the gas delivery tube (111), and the fixing frame (113) is symmetrically installed on the upper and lower sides of the detection tube (112) with the center of the detection tube (112) as a reference.

7. The spontaneous combustion detection and extinguishing device for underground coal mines according to claim 1, characterized in that: The carbon monoxide sensor (114) is fixedly installed at the center of the fixing frame (113) above the detection tube (112), and the ethylene sensor (115) is fixedly installed at the center of the fixing frame (113) below the detection tube (112).

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