A gas extraction monitoring device and a gas extraction method

Abstract

The present application belongs to the technical field of gas monitoring and extraction, and specifically relates to a gas extraction monitoring device and a gas extraction method. The device comprises a gas extraction pipe, and a gas extraction small hole is formed in the gas extraction pipe; a partitioned gas monitoring pipe is arranged in the gas extraction pipe, the partitioned gas monitoring pipe is provided with a gas extraction small hole, and the partitioned gas monitoring pipe is arranged with a gas monitoring head; the end of the gas extraction pipe is connected to a mine tube monitoring system and a mine gas extraction system through a tee pipe. The present application adopts a combined device and method for monitoring and gas extraction of a working face of a gob-side entry retaining, which combines a goaf pipe, a high-position inclined borehole and a partitioned gas monitoring pipe through a combined method of gas monitoring and gas extraction, so that the normal gas extraction work in the goaf of the working face is not affected, and the gas composition in the goaf can be accurately obtained.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas monitoring and extraction, and specifically relates to a gas extraction monitoring device and a gas extraction method. BACKGROUND

[0002] The gob-side entry retaining and coal pillar-free mining technology can improve the resource recovery rate of a mine, prolong the service life of the mine, reduce the tunneling amount of a working face, relieve the replacement contradiction between mining and tunneling, and shorten the moving time of the working face, and is an economic and effective coal mining method. The gob-side entry retaining and coal pillar-free mining technology has been applied to many thin and medium-thick coal seam mining working faces with good conditions in China and good results have been achieved. However, the technology has great safety hazards when used in mines with complex conditions, and specifically, under the condition of the gob-side entry retaining and coal pillar-free mining technology, the gas occurrence condition and migration state of the goaf change, which leads to serious air leakage in the goaf under the condition of the gob-side entry retaining, large gas emission, and difficulty in preventing spontaneous combustion. Therefore, the monitoring of the gas in the goaf and the index gas of coal spontaneous combustion becomes particularly important. Through the monitoring of the gas in the mining field, the occurrence and migration state of the gas in the goaf and the change rule of the concentration of the index gas in the process of coal spontaneous combustion can be accurately understood, which is of great significance for the later gas extraction and prevention of spontaneous combustion.

[0003] Under the condition of the gob-side entry retaining and coal pillar-free mining technology, the gas occurrence condition and migration state of the goaf change, which leads to serious air leakage in the goaf under the condition of the gob-side entry retaining, large gas emission, and difficulty in preventing spontaneous combustion. SUMMARY

[0004] In order to solve the problems of difficult monitoring of the gas distribution characteristics in the goaf and poor gas extraction effect when the gob-side entry retaining and coal pillar-free mining technology is used in the self-igniting (easily self-igniting) coal seam of a high-gas mine, the application provides a device and a method for monitoring the gas in the mining field of a gob-side entry retaining working face and gas extraction.

[0005] The application adopts the following technical scheme: a gas extraction monitoring device, which comprises a gas extraction pipe, the gas extraction pipe is provided with a gas extraction small hole, a partitioned gas monitoring pipe is arranged in the gas extraction pipe, the partitioned gas monitoring pipe is provided with a gas extraction small hole and is arranged with a gas monitoring head, and the end of the gas extraction pipe is connected to a mine tube monitoring system and a mine gas extraction system through a tee pipe.

[0006] In some embodiments, the gas extraction pipe comprises a plurality of connecting pipes I, adjacent two connecting pipes I are connected through an adapter pipe I, and the outer ends of the outermost two connecting pipes I are connected with end pipes I, and the connecting pipes I, the adapter pipe I and the end pipes I are uniformly provided with gas extraction small holes.

[0007] In some embodiments, the partitioned gas monitoring pipe comprises a plurality of connecting pipes II, two adjacent connecting pipes II are connected by an adapter pipe II, and the outer ends of the outermost two connecting pipes II are connected with end pipes II;

[0008] The gas extraction small holes are arranged on the adapter pipe II and the end pipe II,

[0009] The adapter pipe II is internally provided with a gas monitoring thin steel pipe, the connecting pipe II is externally provided with an air bag and internally provided with a gas monitoring thin hose, and the end pipe II is internally provided with a gas monitoring head;

[0010] The gas monitoring thin hose is connected with the monitoring thin steel pipes in the two adjacent adapter pipes II and the gas monitoring head in the end pipe II, and the air bags are connected by air bag connecting pipes.

[0011] In some embodiments, the three interfaces of the three-way pipe are a gas extraction output port, a gas monitoring output port and a connecting port, the connecting port is connected with the gas extraction pipe, the gas monitoring output port is connected with the mine bundle pipe monitoring system, and the gas extraction output port is connected with the gas extraction system.

[0012] A gas extraction method comprises:

[0013] S1: excavating two adjacent working faces;

[0014] S2: after the working face is mined for 15 m from the open-off cut, a gas extraction monitoring device is buried along the inclination in the goaf behind the hydraulic support of the working face, and the gas extraction monitoring device is connected with the mine bundle pipe monitoring system and the mine gas extraction system;

[0015] S3: after the working face is mined for 45 m from the open-off cut, a gas extraction monitoring device is buried along the inclination in the goaf behind the hydraulic support of the working face, a drill site is arranged at the position of the previous gas extraction monitoring device, and a high-position inclination borehole is constructed in the drill site;

[0016] S4: then, every 30 m, a gas extraction monitoring device is buried along the inclination in the goaf behind the hydraulic support of the working face, a drill site is arranged at the position of the previous gas extraction monitoring device, and a high-position inclination borehole is constructed in the drill site;

[0017] S5: the gas in the goaf is automatically and circularly monitored through the gas extraction pipe, the partitioned gas monitoring pipe and the gas monitoring pipe, the air bags are inflated by the inflating device during the monitoring, the air bags are deflated through the air bag inflation-exhaust port of the connecting pipe after the gas monitoring is completed, and the gas is extracted;

[0018] S6: thereafter, the operation is repeated until the working face is mined.

[0019] In some embodiments, the high-position inclined boreholes are arranged in a fan-shaped manner, and are divided into high-position boreholes, middle-position boreholes and low-position boreholes from top to bottom.

[0020] In some embodiments, the terminal hole of the high-position borehole is located at the middle of the goaf in the inclination direction and at the upper boundary of the fractured zone of the goaf in the vertical direction.

[0021] The terminal hole of the middle-position borehole is located at the boundary of the fractured zone on the other side away from the air return roadway and at the middle of the fractured zone in the vertical direction.

[0022] The terminal hole of the low-position borehole is located at the boundary of the fractured zone on the other side away from the air return roadway and at the 1 / 4 height of the fractured zone in the vertical direction.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] (1) The present application adopts a combined device and method for gas monitoring and gas extraction in a gob-side entry retaining working face, which combines the buried pipe in the goaf, the high-position inclined borehole and the partitioned gas monitoring pipe by the combined method of gas monitoring and gas extraction, so that the normal gas extraction in the goaf of the working face is not affected, and the gas composition in the goaf can be accurately obtained.

[0025] (2) The high-position inclined borehole is arranged in a fan-shaped manner, and is divided into high-position boreholes, middle-position boreholes and low-position boreholes from top to bottom, so that the gas distribution in the goaf can be accurately obtained, and corresponding theoretical guidance can be provided for the spontaneous combustion and gas disaster control of the goaf in the later period.

[0026] (3) The present application can solve the problem of complex gas distribution and migration law and serious spontaneous combustion disaster in the gob-side entry retaining non-pillar mining of the coal seam with high gas (easily combustible) in a high-gas mine, and ensure the smooth popularization of the gob-side entry retaining non-pillar mining technology. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a three-dimensional schematic view of the present application;

[0028] Figure 2 is an inclined sectional view of the present application;

[0029] Figure 3 is a schematic view of the gas extraction pipe (gas bag not inflated) of the device for gas monitoring and gas extraction in a gob-side entry retaining working face;

[0030] Figure 4 is a schematic view of the gas extraction pipe (gas bag inflated) of the device for gas monitoring and gas extraction in a gob-side entry retaining working face;

[0031] Figure 5 is a schematic view of the gas extraction adapter pipe;

[0032] Figure 6 Figure 1 is a schematic diagram of a gas extraction pipe connecting pipe;

[0033] Figure 7 Figure 2 is a schematic diagram of a gas extraction pipe end pipe;

[0034] Figure 8 Figure 3 is a schematic diagram of a zoned gas monitoring pipe (air bag not inflated);

[0035] Figure 9 Figure 4 is a schematic diagram of a zoned gas monitoring pipe (air bag inflated);

[0036] Figure 10 Figure 5 is a schematic diagram of a zoned gas monitoring pipe adapter pipe exploded view;

[0037] Figure 11 Figure 6 is a schematic diagram of a zoned gas monitoring pipe connecting pipe exploded view;

[0038] Figure 12 Figure 7 is a schematic diagram of a zoned gas monitoring pipe end pipe exploded view;

[0039] Figure 13 Figure 8 is a schematic diagram of a zoned gas monitoring pipe tee adapter pipe exploded view;

[0040] Figure 1 is a schematic diagram of a zoned gas monitoring pipe (air bag not inflated); DETAILED DESCRIPTION

[0041] The following further describes in detail an embodiment of a method and device for combined gas extraction and gas monitoring in a gob-side entry retaining working face.

[0042] A gas extraction monitoring device, comprising a gas extraction pipe 5, the gas extraction pipe 5 having gas extraction small holes; a zoned gas monitoring pipe 6 is built into the gas extraction pipe 5, the zoned gas monitoring pipe 6 having gas extraction small holes and the zoned gas monitoring pipe 6 being provided with a gas monitoring head 11; the end of the gas extraction pipe 5 is connected to a mine tube monitoring system and a mine gas extraction system through a tee pipe 22.

[0043] As Figure 3 , 4As shown, the gas extraction pipe 5 includes a plurality of connecting pipes I17, two adjacent connecting pipes I17 are connected by an adapter pipe I18, and the outer ends of the outermost two connecting pipes I17 are connected with end pipes I16. Gas extraction small holes are evenly opened on the connecting pipes I17, the adapter pipes I18 and the end pipes I16 (see Figure 5 and Figure 7 ).

[0044] The partition gas monitoring pipe 6 includes a plurality of connecting pipes II20, two adjacent connecting pipes II20 are connected by an adapter pipe II21, and the outer ends of the outermost two connecting pipes II20 are connected with end pipes II19.

[0045] The gas extraction small holes are opened on the adapter pipes II21 and the end pipes II19.

[0046] The adapter pipes II21 are internally provided with gas monitoring thin steel pipes 9, the connecting pipes II20 are externally provided with air bags 8 and internally provided with gas monitoring thin hoses 10, and the end pipes II19 are internally provided with gas monitoring heads 11.

[0047] The gas monitoring thin hoses 10 are connected with the monitoring thin steel pipes 9 in the adjacent two adapter pipes II21 and the gas monitoring head 11 in the end pipe II19, and the air bags 8 are connected by air bag connecting pipes 12.

[0048] The three interfaces of the three-way pipe 22 are a gas extraction output port 15, a gas monitoring output port 14 and a connecting port, the connecting port is connected with the gas extraction pipe 5, the gas monitoring output port 14 is connected with a mine bundle pipe monitoring system, and the gas extraction output port 15 is connected with a gas extraction system.

[0049] As shown in Figure 1 , Figure 2

[0050] S1 opens two adjacent working faces. During the mining process, the working face belt entry and the working face rail entry are used for air intake, and the Y-shaped ventilation mode of air return along the empty roadway is adopted.

[0051] ​S3 Working face from open-off cut mining 15 m, in the working face hydraulic support gob along the tendency buried gas extraction pipe 5, the gas extraction pipe 5 main body outer sleeve steel pipe by adapter pipe 18 (length 0.5 m), connecting pipe 17 (length 2 m) and end pipe 16 (length 0.5 m) is composed, evenly open diameter = 30 mm gas extraction small hole. According to the length of the gob tendency design gob gas extraction pipe 5 length and monitoring position, connecting pipe I18, connecting pipe I17 and end pipe I16 connection, put partition gas monitoring pipe 6 into gas extraction pipe 5, gas monitoring pipe is composed of three parts, including: adapter pipe II21 (length: 0.5 m), connecting pipe II20 (length 2 m) and end pipe II19 (length: 0.5 m), adapter pipe II21 and end pipe II19 are opened diameter = 20 mm gas extraction small hole, and the layout of gas monitoring head, while the adapter pipe built-in monitoring thin steel pipe, connecting pipe II20 outer gas bag 8 built-in monitoring thin hose 10 is used to connect two adapter pipe II21 in the monitoring thin steel pipe 9 and connecting adapter pipe II21 in the monitoring thin steel pipe 9 and end pipe 19 in the gas monitoring head 11, gas bag between through gas bag connecting pipe 12 connection, the gob gas extraction pipe 5 through buried pipe tee pipe 22 (including: gas extraction output 15, gas monitoring output 14 and connecting port, main body outer sleeve steel pipe (length = 0.5 m, diameter = 20 mm), main body inner steel pipe (length = 0.5 m), built-in gas monitoring thin steel pipe (diameter = 10 mm). Access to mine beam pipe monitoring system and mine gas extraction system.

[0052] S4 After the working face has mined 45m from the open-off cut, the gob gas extraction pipe 5 is buried along the inclination in the gob behind the hydraulic support of the working face. The length and monitoring position of the gob gas extraction pipe 5 are designed according to the inclination length of the gob. The adapter pipe I18, the connecting pipe I17 and the end pipe I16 are connected. The partition gas monitoring pipe 6 is put into the gob gas extraction pipe 5. The drilling site 2 is arranged at the position of the previous gob gas extraction pipe 5. The high inclination borehole 4 (borehole diameter = 120mm) is constructed in the drilling site 2. The arrangement mode of the high inclination borehole 4 is inclination fan-shaped arrangement. From top to bottom, the high inclination borehole 4 is divided into high position hole, middle position hole and low position hole. The terminal hole horizontal position of the high position hole is located in the middle of the inclination of the gob. The vertical position of the high position hole is located at the upper boundary of the fracture zone of the gob. The terminal hole horizontal position of the middle position hole is located at the fracture zone boundary away from the return airway. The vertical position of the middle position hole is located in the middle of the fracture zone. The terminal hole horizontal position of the low position hole is located at the fracture zone boundary away from the return airway. The vertical position of the low position hole is located at 1 / 4 of the height of the fracture zone. The partition gas monitoring pipe 6 is installed. The length and monitoring position of the partition gas monitoring pipe 6 are designed according to the length of the high inclination borehole. The adapter pipe II21, the connecting pipe II20 and the end pipe II19 are connected. The air bags are connected by the air bag connecting pipe 12. The gas monitoring head is arranged in the adapter pipe II21 and the end pipe II19. The monitoring thin steel pipe 9 is arranged in the adapter pipe II21. The monitoring thin hose 10 in the connecting pipe II20 is used to connect the monitoring thin steel pipes 9 in the two adapter pipes II21 and connect the monitoring thin steel pipes 9 in the adapter pipes with the gas monitoring head 11 in the end pipe II19. The adapter pipe II21 and the end pipe II19 are uniformly provided with gas extraction small holes 7 with a diameter of 20mm. The high inclination borehole three-way pipe 22 (including: gas extraction outlet 15, gas monitoring outlet 14 and connecting port, main body outer sleeve steel pipe (length = 0.5m, diameter = 20mm), main body inner steel pipe (length = 0.5m), built-in gas monitoring thin steel pipe (diameter = 10mm)) is used to connect the high inclination borehole 7 into the gas extraction system and the partition gas monitoring pipe 6 into the mine bundle pipe monitoring system.

[0053] S5 After every 30m, the gob gas extraction pipe 5 is buried along the inclination in the gob behind the hydraulic support of the working face. The drilling site 2 is arranged at the position of the previous gob gas extraction pipe 5. The high inclination borehole 4 is constructed in the drilling site 2. The arrangement mode of the high inclination borehole 4 is inclination fan-shaped arrangement. From top to bottom, the high inclination borehole 4 is divided into high position hole, middle position hole and low position hole. The terminal hole horizontal position of the high position hole is located in the middle of the inclination of the gob. The vertical position of the high position hole is located at the upper boundary of the fracture zone of the gob. The terminal hole horizontal position of the middle position hole is located at the fracture zone boundary away from the return airway. The vertical position of the middle position hole is located in the middle of the fracture zone. The terminal hole horizontal position of the low position hole is located at the fracture zone boundary away from the return airway. The vertical position of the low position hole is located at 1 / 4 of the height of the fracture zone. The partition gas monitoring pipe 6 is installed. The gas monitoring-gob gas extraction pipe 5, the high inclination borehole 4 and the partition gas monitoring pipe 6 are connected into the mine bundle pipe monitoring system and the mine gas extraction system through the three-way pipe.

[0054] S6 The gas in the goaf is automatically patrolled and monitored through the gas extraction pipe 5, the partition gas monitoring pipe 6 and the beam pipe monitoring system. When monitoring, the connecting pipe external air bag 8 is inflated through the inflation device. After the gas monitoring is completed, the connecting pipe external air bag 8 is deflated through the air bag inflation-exhaust port by the exhaust device. The gas extraction pipe 5 and the high-level borehole 4 perform the gas extraction function.

[0055] S7 This operation is repeated until the working face mining is completed.

Claims

1. A gas extraction monitoring device, characterized in that The gas extraction pipe (5) is provided with gas extraction small holes, and a partition gas monitoring pipe (6) is arranged in the gas extraction pipe (5), the partition gas monitoring pipe (6) is provided with gas extraction small holes, and the partition gas monitoring pipe (6) is arranged with a gas monitoring head (11); the end of the gas extraction pipe (5) is connected to a mine pipe monitoring system and a mine gas extraction system through a three-way pipe (22); The partition gas monitoring pipe (6) comprises a plurality of connecting pipes II (20), and the two adjacent connecting pipes II (20) are connected through an adapter pipe II (21); the outer ends of the two outermost connecting pipes II (20) are connected with end pipes II (19); The gas extraction small holes are arranged on the adapter pipe II (21) and the end pipe II (19), The adapter pipe II (21) is arranged with a gas monitoring thin steel pipe (9), the connecting pipe II (20) is arranged with an air bag (8) and a gas monitoring thin hose (10) inside, and the end pipe II (19) is arranged with a gas monitoring head (11); The gas monitoring thin hose (10) connects the monitoring thin steel pipes (9) in the two adjacent adapter pipes II (21) and the gas monitoring head (11) in the end pipe II (19), and the air bags (8) are connected through air bag connecting pipes (12).

2. The gas extraction monitoring device of claim 1, wherein, The gas extraction pipe (5) comprises a plurality of connecting pipes I (17), and the two adjacent connecting pipes I (17) are connected through an adapter pipe I (18); the outer ends of the two outermost connecting pipes I (17) are connected with end pipes I (16), and the connecting pipes I (17), the adapter pipes I (18) and the end pipes I (16) are uniformly provided with gas extraction small holes.

3. The gas extraction monitoring device of claim 1, wherein, The three interfaces of the three-way pipe (22) are a gas extraction output port (15), a gas monitoring output port (14) and a connecting port, the connecting port is connected with the gas extraction pipe (5), the gas monitoring output port (14) is connected with the mine pipe monitoring system, and the gas extraction output port (15) is connected with the gas extraction system.

4. A gas extraction method using the gas extraction monitoring device according to claim 1, characterized by, It comprises: S1: excavate two adjacent working faces; S2: after the working face is mined for 15m from the open-off cut, a gas extraction monitoring device is buried along the inclination in the goaf behind the hydraulic support of the working face, and the gas extraction monitoring device is connected to a mine pipe monitoring system and a mine gas extraction system; S3: after the working face is mined for 45m from the open-off cut, a gas extraction monitoring device is buried along the inclination in the goaf behind the hydraulic support of the working face, and a drilling site (2) is arranged at the position of the previous gas extraction monitoring device, and a high-inclination drilling hole (4) is constructed in the drilling site (2); S4: thereafter, a gas extraction monitoring device is buried every 30m along the inclination in the goaf behind the hydraulic support of the working face, a drilling site (2) is arranged at the position of the previous gas extraction monitoring device, and a high-inclination drilling hole (4) is constructed in the drilling site (2); S5: the gas in the goaf is automatically monitored through the gas extraction pipe (5), the partition gas monitoring pipe (6) and the gas monitoring pipe, the air bags (8) are inflated through an inflating device during the monitoring, the air bags (8) outside the connecting pipes are deflated after the gas monitoring is completed, and gas extraction is performed; S6: thereafter, the operation is repeated until the working face is mined.

5. The gas extraction method according to claim 4, characterized in that, The arrangement of the high-position inclined boreholes (4) in the steps S3 and S4 is an inclined fan-shaped arrangement, which is divided into high-position holes, middle-position holes and low-position holes from top to bottom.

6. The gas extraction method according to claim 5, characterized in that The terminal hole horizontal position of the high-position holes is located in the middle of the inclined position of the goaf, and the vertical position is located in the upper boundary of the fractured zone of the goaf. The terminal hole horizontal position of the middle-position holes is located at the boundary of the fractured zone on the other side away from the air return roadway, and the vertical position is located in the middle of the fractured zone. The terminal hole horizontal position of the low-position holes is located at the boundary of the fractured zone on the other side away from the air return roadway, and the vertical position is located at 1 / 4 of the height of the fractured zone.

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