Intelligent drainage system for coal mine gas drainage

Abstract

The utility model discloses an intelligent drainage system for coal mine gas drainage, and belongs to the technical field of underground gas drainage. The device comprises a gas drainage main pipe, the gas drainage main pipe draws gas out of a mine by providing negative pressure wind power. The gas drainage main pipe is communicated with a plurality of primary drainage pipes; a plurality of second-stage drainage pipes are communicated with the first-stage drainage pipes; the extending end of the second-stage drainage pipe is inserted into a drainage hole in the ore rock to be arranged; the system further comprises a compressed air main pipe for providing positive pressure, and a pipeline combination of a first-stage compressed air pipe and a second-stage compressed air pipe. The extending end of the second-stage pressure ventilation pipe is inserted into the pumping and discharging hole provided with the second-stage pumping and discharging pipe; an electric valve is arranged on the primary pressure ventilation pipe; the electric valve is electrically connected with the PLC control box through a wire, and the action of the electric valve is controlled by the PLC control box. The PLC control box is powered by a built-in battery; according to the utility model, the problems of low extraction efficiency and higher labor cost existing in the current means of discharging water and gas by using downward pore pressure air are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of underground gas extraction and drainage, and in particular to an intelligent drainage system for coal mine gas extraction and drainage. Background Art

[0002] In order to solve the problem of "difficult drainage and low extraction concentration" in the downward gas extraction drilling holes, compressed air drainage is currently used to promote drainage of the downward holes and release gas, thereby improving extraction efficiency. However, the method of controlling compressed air to promote gas extraction is a manual control valve, which requires manual switching at regular intervals. There are many uncertain factors, and improper operation can easily reduce the efficiency of compressed air drainage. In this case, it is necessary to design an intelligent control system to solve the problems of low extraction efficiency and high labor costs existing in the current means. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an intelligent drainage system for coal mine gas extraction to solve the problems of low extraction efficiency and high labor cost in the current means of using downward hole pressure wind drainage and gas.

[0004] In order to solve the above problems, the utility model provides the following technical solutions:

[0005] A coal mine gas extraction intelligent drainage system; it includes a gas extraction main pipe; the gas extraction main pipe extracts gas and underground water from the mine by providing negative pressure wind; the gas extraction main pipe is connected to no less than two first-level extraction pipes; the first-level extraction pipe is arranged close to the fully mechanized mining end face; each first-level extraction pipe is connected to a plurality of second-level extraction pipes; the extended end of the second-level extraction pipe is inserted into the extraction hole on the ore rock for arrangement; it also includes a compressed air main pipe; the compressed air main pipe is used to provide positive pressure wind into the mine; the compressed air main pipe is connected to a plurality of first-level compressed air pipes; the first-level compressed air pipe is also arranged close to the fully mechanized mining end face; each first-level compressed air pipe is connected to a plurality of second-level compressed air pipes; the extended end of the second-level compressed air pipe is inserted into the extraction hole where the second-level extraction pipe has been arranged; A sealing sleeve is provided in the drainage hole for sealing the gap between the hole wall and the outer diameter of the secondary drainage pipe and the secondary pressure air pipe; an electric valve for controlling the on and off of the primary pressure air pipe is provided on the primary pressure air pipe; the electric valve is electrically connected to the PLC control box through a wire, and the action of the electric valve is controlled by the PLC control box; the PLC control box is powered by a built-in battery; a transfer pipe is provided between the primary drainage pipe and the secondary drainage pipe; the secondary pressure air pipe is inserted from the side wall of the transfer pipe and extends from the inner cavity of the secondary drainage pipe to the drainage hole; it also includes a negative pressure automatic drainer arranged near the end face of the comprehensive mining; the negative pressure automatic drainer is connected to the primary drainage pipe through a drainage pipe, and a drain outlet is provided at the lower part of the negative pressure automatic drainer, and a ditch is also opened at a position adjacent to the drain outlet in the coal mine.

[0006] Preferably, a wind pressure sensor is also provided at the position where the first-level pressure air duct is connected to the pressure air main pipe; the wind pressure sensor is connected to the PLC control box through a wire.

[0007] Preferably, the electric valve is a normally closed valve, and a manual emergency switch is also provided on the electric valve.

[0008] Preferably, every 8 first-level pumping pipes form a compression group; the distance between two adjacent compression groups is not less than 180 meters; the distance between each first-level pumping pipe is not less than 2.5 meters, and the number of second-level pumping pipes arranged on each first-level pumping pipe is 8.

[0009] Preferably, the depth of the secondary exhaust pipe extending into the exhaust hole is less than the depth of the secondary compressed air pipe extending into the exhaust hole.

[0010] Beneficial effects of the utility model:

[0011] The utility model designs an extraction and drainage system for improving the underground water and gas extraction and drainage efficiency of coal mines, which configures the compressed air main pipe, the first-level compressed air pipe and the second-level compressed air pipe in a corresponding manner on a pipeline system of the gas extraction and drainage main pipe, and simultaneously utilizes an electric control valve and a PLC control box to realize sequential compressed air drainage in a round-robin manner at each first-level extraction and drainage pipe position, thereby avoiding excessive water accumulation in a single downward extraction rotation hole, or continuous air supply after compressed air drainage at a single point position, which causes waste of energy, thereby improving the extraction efficiency and reducing the cost of manual control. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model in an embodiment;

[0013] Figure 2 It is a schematic diagram of the utility model device in this embodiment at the fully mechanized mining end face position;

[0014] Explanation of the reference numerals in the accompanying drawings: 1. Gas extraction main pipe, 2. Primary extraction pipe, 3. Secondary extraction pipe, 4. Compressed air main pipe, 5. Primary compressed air pipe, 6. Secondary compressed air pipe, 7. Electric valve, 8. PLC control box, 9. Built-in battery, 10. Wind pressure sensor, 11. Extraction hole, 12. Sealing hole sleeve, 13. Adapter pipe, 14. Negative pressure automatic drain, 15. Ditch. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0016] Example:

[0017] Reference Figure 1The present embodiment provides a coal mine gas extraction intelligent drainage system; it includes a gas extraction main pipe 1; the gas extraction main pipe 1 extracts gas and underground water from the mine by providing negative pressure wind; the gas extraction main pipe 1 is connected to at least two first-level extraction pipes 2; the first-level extraction pipe 2 is arranged close to the fully mechanized mining end face; each first-level extraction pipe 2 is connected to a plurality of second-level extraction pipes 3; the extended end of the second-level extraction pipe 3 is inserted into the extraction hole 11 on the ore rock for arrangement; it also includes a compressed air main pipe 4; the compressed air main pipe 4 is used to provide positive pressure wind into the mine; the compressed air main pipe 4 is connected to a plurality of first-level compressed air pipes Tube 5; the first-level compressed air pipe 5 is also arranged near the fully mechanized mining end face; a number of second-level compressed air pipes 6 are connected to each first-level compressed air pipe 5; the extended end of the second-level compressed air pipe 6 is inserted into the extraction hole 11 where the second-level extraction pipe 3 has been arranged; a sealing sleeve 12 is arranged in the extraction hole 11 for sealing the gap between the hole wall and the second-level extraction pipe 3 and the outer diameter of the second-level compressed air pipe 6; an electric valve 7 for controlling its on and off is arranged on the first-level compressed air pipe 5; the electric valve 7 is electrically connected to the PLC control box 8 through a wire, and the action of the electric valve 7 is controlled by the PLC control box 8; the PLC control box 8 is powered by a built-in battery 9. In this embodiment, the built-in battery is a 1536WH explosion-proof lithium battery for mining, and the electric valve is a 2-inch electric ball valve.

[0018] A wind pressure sensor 10 is also provided at the position where the first-level pressure air pipe 5 is connected to the pressure air main pipe 4; the wind pressure sensor 10 is connected to the PLC control box 8 through a wire. The wind pressure sensor can judge the sealing effect and the extraction effect, and judge whether there is a gas leak by detecting the pressure and flow.

[0019] The electric valve 7 is a normally closed valve, and a manual emergency switch is also provided on the electric valve 7 .

[0020] Every 8 first-level extraction pipes 2 form a compression group; the distance between two adjacent compression groups is not less than 180 meters; the distance between each first-level extraction pipe 2 is not less than 2.5 meters, and the number of second-level extraction pipes 3 provided on each first-level extraction pipe 2 is 8. In this embodiment, wind pressure sensors 10 corresponding to the number of compression groups are provided on the compressed air main pipe according to the distance between the compression groups, and the reliability of pressure and flow judgment is ensured by combining the readings of each wind pressure sensor.

[0021] A transfer tube 13 is provided between the primary discharge tube 2 and the secondary discharge tube 3 ; the secondary compressed air tube 6 is inserted from the side wall of the transfer tube 13 and extends from the inner cavity of the secondary discharge tube 3 to the discharge hole 11 .

[0022] The depth of the secondary exhaust pipe 3 extending into the exhaust hole 11 is less than the depth of the secondary compressed air pipe 6 extending into the exhaust hole 11 .

[0023] It also includes a negative pressure automatic water discharger 14 arranged near the end face of the comprehensive mining; the negative pressure automatic water discharger 14 is connected to the primary suction pipe 2 through a drainage pipe, and a drainage outlet is arranged at the lower part of the negative pressure automatic water discharger 14, and a ditch 15 is also opened at a position adjacent to the drainage outlet in the coal mine.

[0024] When using the utility model device in this embodiment, the following steps can be referred to for operation:

[0025] S1. Install corresponding devices and equipment according to the working requirements in the coal mine and in combination with the illustrations;

[0026] S2. When the same compression and discharge group is subjected to gas extraction and drainage, the wind pressure sensor 10 corresponding to the position of the compression and discharge group first tests whether the pressure that can be provided by the current compressed air pipeline meets the requirements; if the working requirements are met, the PLC control box 8 outputs a connection instruction to the first electric valve 7 on the compression and discharge group, and the compressed air main pipe outputs high-pressure gas to the secondary compressed air pipe 6 via the primary compressed air pipe 5 corresponding to the electric valve 7, and at the same time, in conjunction with the negative pressure in the pipe provided by the secondary extraction pipe 3, under the effect of the gas lift reverse circulation principle, the water and a small amount of coal slag in the extraction and discharge hole are discharged into the gas extraction main pipe 1 along the secondary extraction pipe 3 and the primary extraction pipe 2;

[0027] S3, after which the PLC closes the electric control valve 7, and opens the next electric control valve in the pressure and drainage group one by one for drainage and extraction work;

[0028] S4, then carry out drainage and extraction operations on each pressure and drainage group in turn according to the above process;

[0029] S5. The water and coal slag in the gas extraction main pipe 1 will be discharged into the ditch 15 through the negative pressure automatic water discharger 14 for easy cleaning.

[0030] Considering that there are a lot of gas pipes underground, if all the electric control valves are opened at once, the gas lift effect may be insufficient, and a large amount of air may be mixed into the gas pipes, resulting in low gas extraction efficiency; conventional manual control is not only time-consuming and labor-intensive, but may also result in incomplete extraction of some gas.

Claims

1. A coal mine gas extraction intelligent drainage system, comprising a gas extraction main pipe (1); the gas extraction main pipe (1) extracts gas and underground water from the mine by providing negative pressure wind; the gas extraction main pipe (1) is connected to at least two primary extraction pipes (2); the primary extraction pipe (2) is arranged close to the fully mechanized mining end face; each primary extraction pipe (2) is connected to a plurality of secondary extraction pipes (3); the extended ends of the secondary extraction pipes (3) are inserted into the extraction holes (11) on the ore rock for arrangement; the characteristics are as follows: The system also includes a compressed air main pipe (4); the compressed air main pipe (4) is used to provide positive pressure wind force into the mine; a plurality of first-level compressed air pipes (5) are connected to the compressed air main pipe (4); the first-level compressed air pipe (5) is also arranged near the fully mechanized mining end face; a plurality of second-level compressed air pipes (6) are connected to each first-level compressed air pipe (5); the extended end of the second-level compressed air pipe (6) is inserted into the extraction hole (11) in which the second-level extraction pipe (3) is arranged; a sealing sleeve (12) is arranged in the extraction hole (11) for sealing the gap between the hole wall and the outer diameters of the second-level extraction pipe (3) and the second-level compressed air pipe (6); an electric valve (7) is arranged on the first-level compressed air pipe (5) for controlling the on and off thereof; the electric valve (7) is connected to the PLC control via a wire. The control box (8) is electrically connected, and the action of the electric valve (7) is controlled by the PLC control box (8); the PLC control box (8) is powered by a built-in battery (9); a transfer pipe (13) is provided between the primary extraction pipe (2) and the secondary extraction pipe (3); the secondary pressure air pipe (6) is inserted from the side wall of the transfer pipe (13) and then extends from the inner cavity of the secondary extraction pipe (3) to the extraction hole (11); and also includes a negative pressure automatic drain (14) provided near the fully mechanized mining end face; the negative pressure automatic drain (14) is connected to the primary extraction pipe (2) through a drainage pipe, and a drainage outlet is provided at the bottom of the negative pressure automatic drain (14), and a ditch (15) is also provided at a position adjacent to the drainage outlet in the coal mine.

2. The intelligent drainage system for coal mine gas extraction according to claim 1 is characterized in that: A wind pressure sensor (10) is also provided at the position where the first-level pressure air duct (5) is connected to the pressure air main pipe (4); the wind pressure sensor (10) is connected to the PLC control box (8) via a wire.

3. The intelligent drainage system for coal mine gas extraction according to claim 1 is characterized in that: The electric valve (7) is a normally closed valve, and a manual emergency switch is also provided on the electric valve (7).

4. The intelligent drainage system for coal mine gas extraction according to claim 1 is characterized in that: Every eight first-level extraction pipes (2) form a compression group; the distance between two adjacent compression groups is not less than 180 meters; the distance between each first-level extraction pipe (2) is not less than 2.5 meters, and the number of second-level extraction pipes (3) provided on each first-level extraction pipe (2) is eight.

5. The intelligent drainage system for coal mine gas extraction according to claim 1 is characterized in that: The depth of the secondary exhaust pipe (3) extending into the exhaust hole (11) is smaller than the depth of the secondary compressed air pipe (6) extending into the exhaust hole (11).

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