Dual-purpose fire extinguishing device for coal mine nitrogen production and liquid nitrogen injection

Abstract

The utility model discloses a coal mine nitrogen making gas and liquid nitrogen injection dual -purpose fire prevention and extinguishing device, including first delivery pipe, second delivery pipe, three ways and nitrogen injection pipe, first delivery pipe is arranged on ground and is connected with liquid nitrogen transfer car, second delivery pipe is arranged on ground and is connected with nitrogen making machine, first delivery pipe with second delivery pipe is connected with two ports of three ways respectively, nitrogen injection pipe one end is connected with a port of three ways, the other end of nitrogen injection pipe is arranged in mining area, be provided with first valve on first delivery pipe, be provided with second valve on second delivery pipe, first valve with second valve are connected with control box electricity respectively. Through setting up first delivery pipe and second delivery pipe, cooperate corresponding switch valve, overcome the problem that gas source is not stable, is not suitable for downhole sustained fire extinguishing, two kinds of nitrogen injection mode realize downhole goaf uninterrupted nitrogen injection, have guaranteed the effect of fire prevention and extinguishing.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine fire extinguishing technical field, specifically a coal mine nitrogen making and liquid nitrogen injection dual -purpose fire extinguishing device. BACKGROUND

[0002] The accident caused by coal spontaneous combustion endangers the life safety of miners, hinders the normal exploitation of a large amount of coal resources, and also can cause gas explosion and other thermal power disasters. In line with the principle of prevention first, nitrogen is continuously injected into the goaf to prevent and control the spontaneous combustion of floating coal, which has been recognized as an effective fire prevention technical measure by major coal-producing countries.

[0003] Nitrogen is injected into the coal mine by using nitrogen making machine or through liquid nitrogen as nitrogen source, and the liquid nitrogen is generally transported by liquid nitrogen transport vehicle. Since the coal mine is separated from the chemical plant by a certain distance, the nitrogen injection into the coal mine is difficult to ensure continuous due to the influence of road, weather, coal chemical nitrogen production amount and other factors. If the nitrogen is made by the nitrogen making machine, it is also difficult to ensure the continuous injection of nitrogen once the equipment fails or power failure. The above two nitrogen injection modes have certain deficiencies, so a device that can continuously and stably inject nitrogen into the coal mine needs to be designed. UTILITY MODEL CONTENT

[0004] Therefore, the utility model wants to solve the technical problem to provide a coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device that can continuously and stably inject nitrogen into the coal mine.

[0005] In order to solve the above technical problem, the utility model provides the following technical scheme: a coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, including first conveying pipe, second conveying pipe, three-way and nitrogen injection pipe, the first conveying pipe is arranged on the ground and is connected with liquid nitrogen transport vehicle, the second conveying pipe is arranged on the ground and is connected with nitrogen making machine, the first conveying pipe and the second conveying pipe are connected with two ports of the three-way respectively, one port of the three-way is connected with one end of the nitrogen injection pipe, the other end of the nitrogen injection pipe is arranged in the mining area;First valve is arranged on the first conveying pipe, second valve is arranged on the second conveying pipe, the first valve and the second valve are electrically connected with control box respectively.

[0006] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, the gasifier is arranged on the first conveying pipe adjacent to the position of the liquid nitrogen transport vehicle, and the first flow sensor is arranged on the first conveying pipe adjacent to the position of the three-way.

[0007] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device is provided with the second flow sensor on the second conveying pipe adjacent to the position of the three-way.

[0008] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, the first flow sensor and the second flow sensor are in communication connection with the control box, and the control box is in communication connection with a control computer; the first flow sensor detects the nitrogen flow in the first conveying pipe in real time, and the second flow sensor detects the nitrogen flow in the second conveying pipe in real time.

[0009] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, the surface of the gasifier is connected with the nitrogen making machine through a heat exchange assembly, and the cold energy of the surface of the gasifier is transmitted to the radiator of the nitrogen making machine through the heat exchange assembly.

[0010] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, the heat exchange assembly is a fan, the gasifier is arranged on one side of the nitrogen making machine, and the fan drives airflow to pass through the surface of the gasifier to carry cold energy and blow to the radiator of the nitrogen making machine.

[0011] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, the heat exchange assembly is a water circulation pipeline, one end of the water circulation pipeline is attached to the surface of the gasifier, the other end of the water circulation pipeline is attached to the surface of the radiator of the nitrogen making machine, and liquid in the water circulation pipeline is driven to circulate by a water pump.

[0012] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device, a first control valve is arranged on the first conveying pipe, a second control valve is arranged on the second conveying pipe, a linkage switching component is drivingly connected to the valve rod of the first control valve, and the other end of the linkage switching component is drivingly connected to the valve rod of the second control valve.

[0013] The above-mentioned coal mine nitrogen making and liquid nitrogen injection dual-purpose fire extinguishing device includes a first cylinder body, a second cylinder body, a first piston and a second piston, the first piston is sealingly fitted in the first cylinder body, the second piston is sealingly fitted in the second cylinder body, the first cylinder body and the second cylinder body are coaxially arranged and connected at the ends, the diameter of the first piston is greater than that of the second piston, the first piston and the second piston are fixedly connected through a fixed rod, the first piston is connected with the valve rod of the first control valve through a connecting rod, the second piston is connected with the valve rod of the second control valve through a connecting rod, the first cylinder body is in fluid communication with the first conveying pipe through an air pipe, the second cylinder body is in fluid communication with the second conveying pipe through an air pipe, and a reset spring for driving the second piston to move towards the first cylinder body is installed in the second cylinder body.

[0014] The technical scheme of the utility model has achieved the following beneficial technical effects:

[0015] By setting up a first and a second delivery pipe, along with corresponding switching valves, the problems of unstable gas supply and unsuitability for continuous underground fire extinguishing are overcome. The two nitrogen injection methods enable uninterrupted nitrogen injection into the underground goaf, ensuring the effectiveness of fire prevention and extinguishing. Attached Figure Description

[0016] Figure 1 A schematic diagram of the dual-purpose fire extinguishing device for both nitrogen gas generation and liquid nitrogen injection;

[0017] Figure 2 A schematic diagram of the linkage switching component of this utility model.

[0018] The reference numerals in the diagram are as follows: 1-Liquid nitrogen transport vehicle; 2-First delivery pipe; 3-Vaporizer; 4-First valve; 5-First flow sensor; 6-First control valve; 7-Linkage switching component; 701-First cylinder; 702-First piston; 703-Second cylinder; 704-Second piston; 705-Reset spring; 8-Nitrogen generator; 9-Second delivery pipe; 10-Second valve; 11-Second control valve; 12-Second flow sensor; 13-T-connector; 14-Nitrogen injection pipe; 15-Mining area; 16-Control computer; 17-Control box; 18-Gas pipe. Detailed Implementation

[0019] This embodiment describes a dual-purpose fire prevention and extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines, such as... Figure 1 As shown, the system includes a first delivery pipe 2, a second delivery pipe 9, a tee 13, and a nitrogen injection pipe 14. The first delivery pipe 2 is located on the ground and connected to a liquid nitrogen transport vehicle 1. The second delivery pipe 9 is located on the ground and connected to a nitrogen generator 8. The first delivery pipe 2 and the second delivery pipe 9 are respectively connected to two ports of the tee 13. One end of the nitrogen injection pipe 14 is connected to one port of the tee 13, and the other end of the nitrogen injection pipe 14 is located within the mining area 15. A first valve 4 is installed on the first delivery pipe 2. A vaporizer 3 is installed on the first delivery pipe 2 near the liquid nitrogen transport vehicle 1. A first flow sensor 5 is installed on the first delivery pipe 2 near the tee 13. A second valve 10 is installed on the second delivery pipe 9. A second flow sensor 12 is installed on the second delivery pipe 9 near the tee 13. The first valve 4 and the second valve 10 are electrically connected to a control box 17. Both the first valve 4 and the second valve 10 are electromagnetically driven valves, enabling remote and automatic control after connection to the control box 17.

[0020] like Figure 1As shown, the first flow sensor 5 and the second flow sensor 12 are both connected to the control box 17 via a communication cable, and the control box 17 is connected to the control computer 16. The first flow sensor 5 detects the nitrogen flow rate in the first delivery pipe 2 in real time, and the second flow sensor 12 detects the nitrogen flow rate in the second delivery pipe 9 in real time.

[0021] like Figure 1 As shown, the surface of the vaporizer 3 is connected to the nitrogen generator 8 via a heat exchange assembly. The cooling energy on the surface of the vaporizer 3 is transferred to the radiator of the nitrogen generator 8 through the heat exchange assembly. In some embodiments, the heat exchange assembly is a fan. The vaporizer 3 is located on one side of the nitrogen generator 8. The fan pushes airflow over the surface of the vaporizer 3, carrying the cooling energy, and blows it onto the radiator of the nitrogen generator 8. With the vaporizer 3 installed on one side of the nitrogen generator 8, liquid nitrogen absorbs a large amount of heat when it vaporizes through the vaporizer 3. The surface temperature of the vaporizer 3 is very low. The fan pushes the airflow over... The surface of the vaporizer 3 is cooled before being blown onto the nitrogen generator 8, thus cooling the nitrogen generator, reducing its heat dissipation load, and improving the vaporization effect of the vaporizer 3. In some other embodiments, the heat exchange component is a water circulation pipeline. One end of the water circulation pipeline is in contact with the surface of the vaporizer 3, and the other end is in contact with the radiator surface of the nitrogen generator 8. The liquid in the water circulation pipeline is driven to circulate by a water pump. The water circulation pipeline adopts a ring pipeline, and the water pump drives the liquid in the water circulation pipeline to circulate, thereby using the cooling capacity of the vaporizer 3 to provide heat dissipation for the nitrogen generator 8.

[0022] like Figures 1-2 As shown, a first control valve 6 is installed on the first delivery pipe 2, and a second control valve 11 is installed on the second delivery pipe 9. In this embodiment, both the first control valve 6 and the second control valve 11 are butterfly valves. A linkage switching component 7 is driven and connected to the valve stem of the first control valve 6. The other end of the linkage switching component 7 is driven and connected to the valve stem of the second control valve 11. By using the linkage switching component 7 to simultaneously drive the valve stem angles of the two control valves, the on / off and opening / closing angles of the first delivery pipe 2 and the second delivery pipe 9 are controlled, thereby controlling the flow rate of nitrogen in the two pipelines and coordinating the injection of nitrogen into the mining area. To prevent the two gases from mixing and affecting each other, a one-way valve can be installed at the connection between the first delivery pipe 2 and the tee 13, and a one-way valve can also be installed at the connection between the second delivery pipe 9 and the tee 13, ensuring that nitrogen flows into the mining area 15 only through the nitrogen injection pipe 14.

[0023] like Figure 2As shown, the linkage switching component 7 includes a first cylinder 701, a second cylinder 703, a first piston 702, and a second piston 704. The first piston 702 is sealed within the first cylinder 701, and the second piston 704 is sealed within the second cylinder 703. The first cylinder 701 and the second cylinder 703 are coaxially arranged and their ends are connected to each other. The diameter of the first piston 702 is larger than the diameter of the second piston 704. The first piston 702 and the second piston 704 are fixedly connected by a fixing rod. The first piston 702 is connected to the valve stem of the first control valve 6 by a connecting rod, and the second piston 704 is connected to the valve stem of the second control valve 11 by a connecting rod. The first cylinder 701 is fluidly connected to the first delivery pipe 2 through an air pipe 18, and the second cylinder 703 is fluidly connected to the second delivery pipe 9 through an air pipe 18. A return spring 705 is installed inside the second cylinder 703 to push the second piston 704 toward the first cylinder 701.

[0024] Specifically, the first delivery pipe 2 and the second delivery pipe 9 have the same diameter. The second delivery pipe 9 is connected to the nitrogen storage tank of the nitrogen generator 8. The pressure inside the nitrogen storage tank remains stable. With the same pipe diameter, the greater the flow rate, the greater the pressure. The flow rate inside the pipe is monitored by the first flow sensor 5 and the second flow sensor 12, respectively, to indirectly obtain the pressure inside the pipe. The flow rate is controlled by adjusting the opening of the first valve 4 and the second valve 10. The area of ​​the first piston 702 is larger than the area of ​​the second piston 704. When the liquid nitrogen transfer vehicle 1 is connected to the first delivery pipe 2, the liquid nitrogen is vaporized after passing through the vaporizer 3, such as... Figure 2 As shown, nitrogen enters the first cylinder 701 through the gas pipe 18. The nitrogen output from the nitrogen generator 8 is input into the second cylinder 703 through the second delivery pipe 9. The first piston 702 pushes the second piston 704 to compress the return spring 705. The first piston 702 drives the first control valve 6 to open. Simultaneously, the second piston 704 drives the second control valve 11 to close. At this time, nitrogen is supplied into the nitrogen injection pipe 14 using the liquid nitrogen transfer vehicle 1. When the liquid nitrogen in the liquid nitrogen transfer vehicle 1 is exhausted, the output pressure gradually decreases, and the pressure applied to the first piston 702 also gradually decreases until the thrust applied by the first piston 702 is less than the combined force applied by the second piston 704 and the return spring 705. The return spring 705 and the gas pressure in the second delivery pipe 9 jointly push the second piston 704, causing the first piston 702 to push the first control valve 6 to close. At the same time, the second control valve 11 gradually opens, and nitrogen injection is performed through the nitrogen generator 8.

[0025] Obviously, the above embodiments are only examples for clearly illustrating the present application and are not intended to limit the present application. Based on the above description, one of ordinary skill in the art can make other different forms of changes or modifications. Here, it is not necessary or possible to enumerate all the embodiments. The obvious changes or modifications derived from the above should be covered in the protection scope of the present application.

Claims

1. A dual-purpose fire prevention and extinguishing device for coal mines, capable of both producing nitrogen gas and injecting liquid nitrogen, characterized in that... It includes a first delivery pipe (2), a second delivery pipe (9), a tee (13) and a nitrogen injection pipe (14). The first delivery pipe (2) is arranged on the ground and connected to the liquid nitrogen transport vehicle (1). The second delivery pipe (9) is arranged on the ground and connected to the nitrogen generator (8). The first delivery pipe (2) and the second delivery pipe (9) are respectively connected to the two ports of the tee (13). One end of the nitrogen injection pipe (14) is connected to one port of the tee (13). The other end of the nitrogen injection pipe (14) is arranged in the mining area (15). A first valve (4) is provided on the first delivery pipe (2), and a second valve (10) is provided on the second delivery pipe (9). The first valve (4) and the second valve (10) are respectively electrically connected to the control box (17).

2. The dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 1, characterized in that, A vaporizer (3) is provided on the first delivery pipe (2) near the liquid nitrogen transfer vehicle (1), and a first flow sensor (5) is provided on the first delivery pipe (2) near the tee (13).

3. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 2, characterized in that, A second flow sensor (12) is provided on the second delivery pipe (9) near the tee (13).

4. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 3, characterized in that, The first flow sensor (5) and the second flow sensor (12) are both connected to the control box (17), and the control box (17) is connected to the control computer (16). The first flow sensor (5) detects the nitrogen flow rate in the first delivery pipe (2) in real time, and the second flow sensor (12) detects the nitrogen flow rate in the second delivery pipe (9) in real time.

5. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 2, characterized in that, The surface of the vaporizer (3) is connected to the nitrogen generator (8) through a heat exchange assembly, and the cooling energy of the surface of the vaporizer (3) is transferred to the radiator of the nitrogen generator (8) through the heat exchange assembly.

6. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 5, characterized in that, The heat exchange component is a fan, and the vaporizer (3) is located on one side of the nitrogen generator (8). The fan pushes the airflow across the surface of the vaporizer (3) and carries the cold air to the radiator of the nitrogen generator (8).

7. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 5, characterized in that, The heat exchange component is a water circulation pipeline. One end of the water circulation pipeline is attached to the surface of the vaporizer (3), and the other end of the water circulation pipeline is attached to the radiator surface of the nitrogen generator (8). The liquid in the water circulation pipeline is circulated by a water pump.

8. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 1, characterized in that, A first control valve (6) is provided on the first delivery pipe (2), and a second control valve (11) is provided on the second delivery pipe (9). A linkage switching component (7) is driven to the valve stem of the first control valve (6), and the other end of the linkage switching component (7) is driven to the valve stem of the second control valve (11).

9. A dual-purpose fire extinguishing device for producing nitrogen gas and injecting liquid nitrogen in coal mines according to claim 8, characterized in that, The linkage switching component (7) includes a first cylinder (701), a second cylinder (703), a first piston (702), and a second piston (704). The first piston (702) is sealed within the first cylinder (701), and the second piston (704) is sealed within the second cylinder (703). The first cylinder (701) and the second cylinder (703) are coaxially arranged and their ends are connected to each other. The diameter of the first piston (702) is larger than the diameter of the second piston (704). The first piston (702) and the second piston (704) are connected in series. 04) The first piston (702) is connected to the valve stem of the first control valve (6) via a connecting rod, and the second piston (704) is connected to the valve stem of the second control valve (11) via a connecting rod. The first cylinder (701) is connected to the first delivery pipe (2) via an air pipe (18), and the second cylinder (703) is connected to the second delivery pipe (9) via an air pipe (18). A return spring (705) is installed inside the second cylinder (703) to push the second piston (704) to move toward the first cylinder (701).

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