Fire preventing and extinguishing preset pipeline device for coal mine closed area

Abstract

One end of a seamless steel pipe extends in the closed area, a gas sampling pipeline and a temperature measuring optical fiber penetrate into the seamless steel pipe, and a sampling head is installed on the pipe wall, located in the closed area, of the seamless steel pipe in a fluid conduction mode. A gas inlet of the gas sampling pipeline is connected with the sampling head and is communicated with fluid in the closed area; an inert gas conveying channel is formed between the inner wall of the seamless steel pipe and the gas sampling pipeline, and the seamless steel pipe is communicated with inert gas generating system fluid. A seamless steel pipe is arranged, a gas sampling pipeline and a temperature measuring optical fiber are integrated into the seamless steel pipe, due to the supporting effect of the steel pipe, the steel pipe can extend into a closed area, and by matching with a plurality of sampling heads, sampling, precise positioning and recognition of spontaneous combustion and ignition in the closed area on multiple points in the closed area are achieved, and inert gas can be injected into the closed area at multiple points; inert gas can be evenly diffused, rapid fire extinguishing is achieved while the fire extinguishing effect is improved, and further expansion of disasters is prevented.

Description

Technical Field

[0001] This invention relates to the field of coal mine management technology. Specifically, it relates to a pre-installed pipeline device for fire prevention and extinguishing in enclosed areas of coal mines. Background Technology

[0002] The "Coal Mine Safety Regulations" require that mines mining easily spontaneously combustible coal seams must prepare a special fire prevention and extinguishing design and adopt comprehensive measures to prevent spontaneous combustion of coal seams. Building sealing is the primary containment measure, which involves sealing off the oxygen supply to areas underground requiring fire prevention and extinguishing, thereby preventing fires from occurring or stopping their continuation or spread, and achieving the purpose of fire prevention or extinguishing.

[0003] Upon discovering a fire, it is crucial to quickly construct a sealed wall to enclose the fire zone. Afterward, enhanced observation and monitoring within the sealed area are essential to understand the gas composition and temperature in real time. Injecting inert gas into the sealed area to dilute the oxygen is currently the most effective method for stopping or extinguishing fires. Current methods for monitoring sealed areas primarily involve extracting gas from the sealed area using bundled tubes, measuring and analyzing the temperature, determining the extent of spontaneous combustion within the goaf based on the characteristic gas composition and temperature, and then injecting inert gas into the sealed area based on the analysis results.

[0004] The above methods require piping through a sealed wall and separately arranging bundled tubes, temperature-sensing optical fibers, and nitrogen injection tubes. This is labor-intensive and time-consuming. Furthermore, the extension distance of each pipe after passing through the sealed wall is relatively short, and the gas and temperature sampling points are close to the sealed wall. Due to the large space within the sealed area, the analysis results cannot reflect the entire goaf situation, affecting the accuracy of the judgment. In addition, injecting inert gases (mainly CO2 and N2) into the sealed area requires the nitrogen injection tubes to be laid near the sealed wall. Due to the poor gas flow within the sealed area, the injected inert gas relies on slow natural diffusion, requiring a long time to reach the interior of the goaf, and the uneven distribution affects the fire prevention and extinguishing effect. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide a pre-set pipeline device for fire prevention and extinguishing in coal mine closed areas that can collect gas samples from different locations in a closed area and at the same time enable inert gas to diffuse rapidly and evenly.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pre-set pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine, wherein one end of a seamless steel pipe extends within the closed area, a gas sampling pipeline and a temperature measuring optical fiber are inserted into the seamless steel pipe, a sampling head is fluid-conductingly installed on the pipe wall of the seamless steel pipe located within the closed area, the inlet of the gas sampling pipeline is connected to the sampling head and is fluid-conducting within the closed area; an inert gas transport channel is formed between the inner wall of the seamless steel pipe and the gas sampling pipeline, the seamless steel pipe is fluid-conducting with an inert gas generating system, the inert gas transport channel is fluid-conducting with the sampling head, and inert gas is transported from the sampling head to different areas within the closed area through the inert gas transport channel.

[0007] The above-mentioned pre-set pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine includes a sampling head comprising a connecting piece, a branch connector connected to the seamless steel pipe, the connecting piece being fitted and installed on the end of the branch connector, the inlet of the gas sampling pipeline being connected to the connecting piece and passing through the connecting piece to form fluid communication with the closed area, a first through hole being provided on the connecting piece, and the inert gas delivery channel being fluidly connected to the first through hole.

[0008] The aforementioned pre-installed pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine includes a sampling head that further comprises a connecting cylinder and a dust filter. The connecting cylinder is threadedly connected to the branch connector, and a protrusion on the inner wall of the connecting cylinder presses the connecting plate against the end of the branch connector. The dust filter is sealed to the cylinder wall of the connecting cylinder and is disposed between the connecting plate and the bottom of the connecting cylinder. An air hole is provided on the bottom of the connecting cylinder, and an air hole is also provided on the cylinder wall between the bottom of the connecting cylinder and the dust filter.

[0009] The aforementioned pre-installed pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine includes an inert gas generating system located outside the closed area, a seamless steel pipe with both ends sealed, an end of a temperature-measuring optical fiber connected to an optical fiber temperature measurement system outside the closed area, and an end of a gas sampling pipeline connected to a coal mine bundled tube fire monitoring system outside the closed area.

[0010] The aforementioned pre-set pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine includes two or more sampling heads arranged along the length of the seamless steel pipe. Each sampling head is fluidly connected to a gas sampling pipeline and to an inert gas delivery channel.

[0011] The aforementioned pre-installed pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine has a gap between the outer wall of the gas sampling pipeline and the inner wall of the seamless steel pipe, through which inert gas flows.

[0012] The aforementioned pre-installed pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine includes a support ring installed inside the seamless steel pipe, a bracket installed on the support ring, a gas sampling pipeline installed inside the bracket, and a temperature measuring optical fiber fitted to the inner wall of the seamless steel pipe.

[0013] The aforementioned pre-installed pipeline device for fire prevention and extinguishing in a confined area of ​​a coal mine includes a movable plate mounted on the side wall of the connecting piece away from the seamless steel pipe via a hinged seat. The first end of the movable plate corresponds to the first through hole, and the second end corresponds to the air inlet of the gas sampling pipeline. A first sealing block is installed on the first end of the movable plate, and a second sealing block is installed on the second end. When the inert gas does not pass through the first through hole, the second sealing block presses down on the movable plate, causing the first sealing block to seal against the first through hole. When the inert gas passes through the first through hole, the airflow pushes the first sealing block down on the movable plate, causing the second sealing block to seal against the air inlet of the gas sampling pipeline. By setting the movable plate, the weight of the second sealing block is greater than that of the first sealing block. Under normal conditions, the first sealing block is in a closed state. When the gas sampling pipeline is evacuating, the first through hole is closed and not connected to the inert gas delivery channel. When the inert gas is being delivered, the airflow can cause the second sealing block to seal the gas sampling pipeline, thereby preventing excessive inert gas from entering the coal mine bundled tube fire monitoring system.

[0014] The aforementioned pre-set pipeline device for fire prevention and extinguishing in a closed area of ​​a coal mine includes a fixed pipe connected to the inlet of the gas sampling pipeline. The end of the fixed pipe is fixedly connected to the middle of the connecting piece and passes through the connecting piece.

[0015] The aforementioned pre-installed pipeline device for fire prevention and extinguishing in a confined area of ​​a coal mine includes a gas sampling pipeline that is connected to a telescopic airbag via a gas pipe. A one-way valve is installed on the gas pipe to allow gas to flow unidirectionally from the telescopic airbag to a fixed pipe. One end of the telescopic airbag is fixed inside a branch connector, and a cover plate is connected to the other end of the telescopic airbag. A second through-hole is provided on the connecting plate, and the cover plate is sealed and fitted onto the second through-hole. The second through-hole is directly connected to the fluid in the space outside the sampling head via the pipeline. A flow-limiting orifice is provided on the telescopic airbag. By setting up the telescopic airbag, after a single sampling at a single point, the second through-hole opens, allowing a larger amount of inert gas to be injected into that point first in the event of a fire, thus improving the fire prevention and extinguishing effect.

[0016] The technical solution of the present invention achieves the following beneficial technical effects:

[0017] 1. By setting up a seamless steel pipe, the gas sampling pipeline and temperature measuring optical fiber are integrated into its interior, simplifying the structure and facilitating rapid deployment. Due to the supporting effect of the steel pipe, it can extend into the closed area. With multiple sampling heads, multiple points in the closed area can be sampled, improving accuracy. Inert gas can be injected into the closed area at multiple points, facilitating uniform diffusion of the inert gas.

[0018] 2. By using seamless steel pipes, not only is the layout convenient, but the internal pipelines are also protected from damage by external forces. When inert gas flows through the seamless steel pipes, it can cool the internal pipelines, and the pipelines are in an inert gas atmosphere, which protects the gas sampling pipelines. At the same time, the temperature of each monitoring point of the temperature measuring fiber decreases and then rises to the normal temperature, which can verify whether the temperature measuring fiber is working properly. Attached Figure Description

[0019] Figure 1 A schematic diagram of the layout of the fire prevention and extinguishing pre-installed pipeline of the present invention;

[0020] Figure 2 A schematic diagram of the seamless steel pipe and sampling head of this invention;

[0021] Figure 3 A schematic cross-sectional view of the sampling head of this invention;

[0022] Figure 4 A schematic diagram of the cross-section of the seamless steel pipe of this invention.

[0023] The reference numerals in the figure are as follows: 1-Seamless steel pipe; 2-Branch connector; 3-Gas sampling pipeline; 31-Fixed pipe; 4-Temperature measuring fiber optic cable; 5-Sampling head; 51-Connecting cylinder; 52-Dust filter; 53-Air hole; 54-Connecting piece; 55-First through hole; 6-Coal mine bundled tube fire monitoring system; 7-Fiber optic temperature measurement system; 8-Connecting pipe; 9-Inert gas generation system; 10-Moving plate; 11-First sealing block; 12-Second sealing block; 13-Telescopic airbag; 14-Support plate; 15-Gas pipe; 16-Cover plate; 17-Second through hole; 18-Bracket; 19-Support ring. Detailed Implementation

[0024] This embodiment provides a pre-set pipeline device for fire prevention and extinguishing in a confined area of ​​a coal mine, such as... Figure 1-2As shown, one end of the seamless steel pipe 1 extends within the sealed area. A gas sampling pipe 3 and a temperature measuring optical fiber 4 are inserted inside the seamless steel pipe 1. The end of the temperature measuring optical fiber 4 is connected to the optical fiber temperature measuring system 7 outside the sealed area. The end of the gas sampling pipe 3 is connected to the coal mine bundled tube fire monitoring system 6 outside the sealed area. A sampling head 5 is installed on the pipe wall of the seamless steel pipe 1 within the sealed area, and the inlet of the gas sampling pipe 3 is connected to the sampling head 5 and is in fluid communication with the sealed area. An inert gas transport channel is formed between the inner wall of the seamless steel pipe 1 and the gas sampling pipe 3. The seamless steel pipe 1 is in fluid communication with the inert gas generating system 9, which is located outside the sealed area. Both ends of the seamless steel pipe 1 are closed. The inert gas transport channel is in fluid communication with the sampling head 5. The inert gas is transported from the sampling head 5 to different areas within the sealed area through the inert gas transport channel.

[0025] like Figure 2 As shown, further, two or more sampling heads 5 are arranged along the length of the seamless steel pipe 1. The specific number of gas sampling pipelines 3 and the number of sampling heads 5 are determined according to the length of the goaf and the monitoring needs. Each sampling head 5 is fluidly connected to one gas sampling pipeline 3, and each sampling head 5 is fluidly connected to the inert gas delivery channel.

[0026] like Figure 3 As shown, the sampling head 5 includes a connecting piece 54, a connecting cylinder 51, and a filter plate 52. A branch connector 2 is connected to the seamless steel pipe 1. The connecting piece 54 is fitted onto the end of the branch connector 2. The air inlet of the gas sampling pipeline 3 is connected to the connecting piece 54 and passes through the connecting piece 54 to form fluid communication with the sealed area. A first through hole 55 is opened on the connecting piece 54, and the inert gas delivery channel is fluidly connected to the first through hole 55. The connecting cylinder 51 is threadedly connected to the branch connector 2. The boss on the inner wall of the connecting cylinder 51 presses the connecting piece 54 tightly onto the end of the branch connector 2. The filter plate 52 is sealed to the cylinder wall of the connecting cylinder 51 and is disposed between the connecting piece 54 and the bottom of the connecting cylinder 51. An air hole 53 is opened on the bottom of the connecting cylinder 51, and an air hole 53 is also opened on the cylinder wall between the bottom of the connecting cylinder 51 and the filter plate 52.

[0027] like Figure 4 As shown, a support ring 19 is installed inside the seamless steel pipe 1, and a bracket 18 is installed on the support ring 19. The gas sampling pipeline 3 is installed inside the bracket 18, and the temperature measuring optical fiber 4 is fitted to the inner wall of the seamless steel pipe 1. There is a gap between the outer wall of the gas sampling pipeline 3 and the inner wall of the seamless steel pipe 1, and inert gas flows through the gap between the seamless steel pipe 1 and the gas sampling pipeline 3.

[0028] like Figure 3As shown, a movable plate 10 is mounted on the side wall of the connecting piece 54 away from the seamless steel pipe 1 via a hinge seat. The first end of the movable plate 10 corresponds to the first through hole 55, and the second end of the movable plate 10 corresponds to the air inlet of the gas sampling pipeline 3. A first sealing block 11 is installed on the first end of the movable plate 10, and a second sealing block 12 is installed on the second end of the movable plate 10. When the inert gas does not pass through the first through hole 55: the second sealing block 12 presses down on the movable plate 10 to seal the first sealing block 11 with the first through hole 55. When the inert gas passes through the first through hole 55: the airflow pushes the first sealing block 11 down on the movable plate 10 to seal the second sealing block 12 with the air inlet of the gas sampling pipeline 3.

[0029] like Figure 2-4 As shown, a fixed pipe 31 is connected to the air inlet of the gas sampling pipeline 3. The end of the fixed pipe 31 is fixedly connected to the middle of the connecting piece 54 and passes through the connecting piece 54. The gas sampling pipeline 3 is fluidly connected to the telescopic airbag 13 through the air pipe 15. A one-way valve is installed on the air pipe 15 to allow gas to flow unidirectionally from the telescopic airbag 13 to the fixed pipe 31. One end of the telescopic airbag 13 is fixed in the branch connector 2. A cover plate 16 is connected to the other end of the telescopic airbag 13. A second through hole 17 is opened on the connecting piece 54. The cover plate 16 is sealed and fitted to the second through hole 17. The second through hole 17 is directly connected to the space fluid outside the sampling head 5 through the pipeline. A flow-limiting hole is opened on the telescopic airbag 13. The inner diameter of the flow-limiting hole is smaller than the inner diameter of the air pipe 15. Air enters the telescopic airbag 13 through the flow-limiting hole. Due to the small flow rate, the telescopic airbag 13 slowly returns to its original length.

[0030] The fire prevention and extinguishing pre-installed pipeline system can be pre-arranged within the goaf area. Seamless steel pipe 1 is placed at the corresponding location within the goaf area, and various monitoring systems are assembled to monitor spontaneous combustion in the goaf area. Alternatively, after a fire occurs and the goaf area is sealed off, holes can be drilled in the sealing wall, and seamless steel pipe 1 can be led out of the sealing wall to monitor spontaneous combustion within the sealed area and to inject inert gas (nitrogen, carbon dioxide, etc.) for fire prevention and extinguishing.

[0031] The temperature-measuring fiber optic cable 4 is connected to the fiber optic temperature measurement system 7 outside the confined area to realize real-time monitoring of the temperature in different areas within the confined area. The gas sampling pipeline 3 uses mining polyethylene pipe to connect to the coal mine bundled tube fire monitoring system 6 outside the confined area to monitor the gas composition at different locations in real time, realize accurate judgment of fire zones, and provide support for accurate fire prevention and extinguishing in confined areas.

[0032] Seamless steel pipe 1 is connected to inert gas generation system 9. When gas injection is required, gas is quickly delivered to each sampling head 5 through seamless steel pipe 1, and inert gas is distributedly injected into the closed area to achieve the goal of rapid fire prevention and extinguishing.

[0033] Specifically, such as Figure 2-3As shown, during air extraction sampling, the air extraction pump in the coal mine bundled tube fire monitoring system 6 extracts air. The air in the sealed area enters the gas sampling pipeline 3 through the air hole 53, the dust filter 52, and the fixed pipe 31 in sequence, and finally enters the coal mine bundled tube fire monitoring system 6 for gas analysis. One end of the movable plate 10 is pressed down by the second sealing block 12, and the fixed pipe 31 is in the open state, so air extraction can be carried out. The other end of the movable plate 10 is raised and pushes the first sealing block 11 to seal the first through hole 55. When the fixed pipe 31 extracts air, the gas in the telescopic air bag 13 is extracted through the air pipe 15. The telescopic air bag 13 contracts and drives the cover plate 16, and the second through hole 17 is opened. The amount and range of inert gas injection can be adjusted according to the actual situation of spontaneous combustion in the sealed area.

[0034] When the gas analysis at point A is abnormal, indicating a potential fire hazard, the inert gas generating system 9 injects inert gas into the seamless steel pipe 1 through the connecting pipe 8. The inert gas flows out from the sampling head 5 at point A. The telescopic airbag 13 keeps the second through hole 17 open for a certain period of time under the action of the flow limiting hole. Then, the inert gas is output from the first through hole 55. The airflow pushes the first sealing block 11, causing the second sealing block 12 to block the fixed pipe 31. After passing through the dust filter 52, it is released in all directions from the air hole 53. At the same time, it blows out impurities and water vapor in the sampling head 5. Another path is directly discharged from the second through hole 17 and the pipeline connected to it, increasing the amount of inert gas injected at point A and achieving multi-directional uniform gas injection.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A pre-set pipeline device for fire prevention and extinguishing in a confined area of ​​a coal mine, characterized in that, One end of a seamless steel pipe (1) extends into a sealed area. A gas sampling pipe (3) and a temperature measuring fiber (4) are inserted into the seamless steel pipe (1). A sampling head (5) is installed on the pipe wall of the seamless steel pipe (1) in a fluid-conducting manner within the sealed area. The inlet of the gas sampling pipe (3) is connected to the sampling head (5) and is in fluid communication with the sealed area. An inert gas transport channel is formed between the inner wall of the seamless steel pipe (1) and the gas sampling pipe (3). The seamless steel pipe (1) is in fluid communication with the inert gas generation system (9). The inert gas transport channel is in fluid communication with the sampling head (5). The inert gas is transported from the sampling head (5) to different areas within the sealed area through the inert gas transport channel.

2. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 1, characterized in that, The sampling head (5) includes a connecting piece (54), and a branch connector (2) is connected to the seamless steel pipe (1). The connecting piece (54) is fitted and installed on the end of the branch connector (2). The air inlet of the gas sampling pipeline (3) is connected to the connecting piece (54) and passes through the connecting piece (54) to form fluid communication with the sealed area. A first through hole (55) is opened on the connecting piece (54), and the inert gas delivery channel is fluidly connected to the first through hole (55).

3. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 2, characterized in that, The sampling head (5) also includes a connecting cylinder (51) and a filter plate (52). The connecting cylinder (51) is threadedly connected to the branch connector (2). The boss on the inner wall of the connecting cylinder (51) presses the connecting piece (54) against the end of the branch connector (2). The filter plate (52) is sealed to the cylinder wall of the connecting cylinder (51) and is disposed between the connecting piece (54) and the bottom of the connecting cylinder (51). An air hole (53) is provided on the bottom of the connecting cylinder (51). An air hole (53) is also provided on the cylinder wall between the bottom of the connecting cylinder (51) and the filter plate (52).

4. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 1, characterized in that, The inert gas generating system (9) is located outside the sealed area. The two ends of the seamless steel pipe (1) are closed. The end of the temperature measuring fiber (4) is connected to the fiber optic temperature measuring system (7) outside the sealed area. The end of the gas sampling pipeline (3) is connected to the coal mine bundled tube fire monitoring system (6) outside the sealed area.

5. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 1, characterized in that, Two or more sampling heads (5) are arranged along the length of the seamless steel pipe (1). Each sampling head (5) is fluidly connected to a gas sampling pipeline (3) and each sampling head (5) is fluidly connected to an inert gas delivery channel.

6. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 1, characterized in that, There is a gap between the outer wall of the gas sampling pipeline (3) and the inner wall of the seamless steel pipe (1), and the inert gas flows through the gap between the seamless steel pipe (1) and the gas sampling pipeline (3).

7. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 1, characterized in that, A support ring (19) is installed inside the seamless steel pipe (1), and a bracket (18) is installed on the support ring (19). The gas sampling pipeline (3) is installed inside the bracket (18), and the temperature measuring optical fiber (4) is fitted to the inner wall of the seamless steel pipe (1).

8. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 2, characterized in that, A movable plate (10) is mounted on the side wall of the connecting piece (54) away from the seamless steel pipe (1) via a hinge seat. The first end of the movable plate (10) corresponds to the first through hole (55), and the second end of the movable plate (10) corresponds to the air inlet of the gas sampling pipeline (3). A first sealing block (11) is installed on the first end of the movable plate (10), and a second sealing block (12) is installed on the second end of the movable plate (10). When the inert gas does not pass through the first through hole (55): the second sealing block (12) presses down on the movable plate (10) to seal the first sealing block (11) with the first through hole (55). When the inert gas passes through the first through hole (55): the airflow pushes the first sealing block (11) to press down on the movable plate (10) to seal the second sealing block (12) with the air inlet of the gas sampling pipeline (3).

9. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 2, characterized in that, A fixed tube (31) is connected to the inlet of the gas sampling pipeline (3). The end of the fixed tube (31) is fixedly connected to the middle of the connecting piece (54) and passes through the connecting piece (54).

10. A pre-installed fire prevention and extinguishing pipeline device for a confined area in a coal mine according to claim 2, characterized in that, The gas sampling pipeline (3) is fluidly connected to a telescopic airbag (13) through a gas pipe (15). A one-way valve is installed on the gas pipe (15) to allow gas to flow unidirectionally from the telescopic airbag (13) to the fixed pipe (31). One end of the telescopic airbag (13) is fixed in the branch connector (2). A cover plate (16) is connected to the other end of the telescopic airbag (13). A second through hole (17) is opened on the connecting piece (54). The cover plate (16) is sealed and fitted to the second through hole (17). A flow-limiting hole is opened on the telescopic airbag (13).

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