Efficient underground coal seam gas extraction device and using method thereof

Abstract

The invention provides an underground coal seam gas efficient extraction device and a using method thereof. The underground coal seam gas efficient extraction device comprises a coal seam and a well, a lifting pipe and an extraction pipe are arranged in the well, an upper sealing plate and a lower sealing plate are arranged in the well, and the lifting pipe penetrates through the upper sealing plate and is fixedly connected with the lower sealing plate; the top end of the extraction pipe is connected with the extraction machine, and the bottom end penetrates through the upper sealing plate and extends between the upper sealing plate and the lower sealing plate; an electric push rod is arranged at the position, corresponding to the axis of the lifting pipe, of the lower sealing plate, a conical head is arranged at the telescopic end of the electric push rod, a plurality of guide frames are arranged outside the lifting pipe in the circumferential direction, sliding rods are slidably arranged on the guide frames and penetrate through the lifting pipe, and abutting blocks attached to the conical head are arranged at the ends, located in the lifting pipe, of the sliding rods; a foundation plate is arranged at the other end of the sliding rod, rock breaking nails are arranged on the foundation plate, a baffle is further arranged on the sliding rod, and the sliding rod is sleeved with a first tension spring. According to the efficient extraction device for the underground coal seam gas and the using method of the efficient extraction device, the coal seam gas can be extracted efficiently.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam gas extraction, and in particular to an underground coal seam gas high-efficiency extraction device and a use method thereof. Background Art

[0002] Most of the coalbed methane storage areas belong to low-permeability coal seams, which makes it difficult to implement coalbed methane pre-extraction and the effect is very poor. Therefore, researchers have studied the gas extraction technology of low-permeability coal seams. The basic starting point of the research is to improve the permeability of coal seams or increase the drilling length per unit coal body to achieve the purpose of increasing the extraction rate. Among them, in the measure of increasing the drilling length per unit coal body, it is easy for some of the gas stored in the coal seam to overflow into the atmosphere, which not only seriously affects the living environment of human beings, but also wastes a large amount of non-renewable energy. Therefore, how to improve the permeability of coal seams by cracking the rock strata inside the mine has become an important research direction for researchers.

[0003] Therefore, it is necessary to propose an efficient gas extraction device for low permeability coal seams to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide an underground coal seam gas efficient extraction device and a method for using the same in view of the deficiencies in the prior art. The specific scheme is as follows: A device for efficiently extracting gas from underground coal seams, comprising a coal seam and a shaft opened in the coal seam, wherein a lifting pipe and an extraction pipe are arranged in the shaft, an upper sealing plate and a lower sealing plate are arranged in the shaft, the lifting pipe passes through the upper sealing plate and is fixedly connected thereto, the bottom end of the lifting pipe is fixedly connected to the lower sealing plate, and air holes are arranged on both the upper sealing plate and the lower sealing plate; the lifting pipe and the extraction pipe extend to the outside of the shaft, the top end of the extraction pipe is connected to the extraction machine, the bottom end of the extraction pipe passes through the upper sealing plate and extends between the upper sealing plate and the lower sealing plate; an electric push rod is arranged on the lower sealing plate at a position corresponding to the axis of the lifting pipe, the telescopic end of the electric push rod is provided with a conical head, and a plurality of guide holes are arranged on the outside of the lifting pipe along the circumferential direction The guide frame is fixed on the lifting tube through a support rod, and a sliding rod with a square cross-section is slidably provided on the guide frame, and the sliding rod passes through the lifting tube, and one end of the sliding rod located in the lifting tube is provided with an abutment block fitting the conical head, and the other end of the sliding rod is provided with a base plate, and the base plate is provided with a plurality of rock breaking nails for breaking the coal and rock on the side wall of the shaft, and a baffle is also provided on the sliding rod, and a tension spring 1 is sleeved on the sliding rod, and the two ends of the tension spring 1 are respectively abutted against the baffle and the guide frame; the upper sealing plate and the lower sealing plate are both provided with sealing components for the air vents, and the sealing component is associated with one of the guide frames; the extraction machine and the electric push rod are electrically connected to a controller arranged outside the shaft.

[0005] Based on the above, the sealing assembly includes a plurality of guide rods fixedly mounted on the upper sealing plate or the lower sealing plate, a lifting plate is slidably provided on the guide rod, a sealing head for the air vent is provided on the lifting plate, and two tension springs for applying tension to the lifting plate are sleeved on the guide rod; the sealing head is connected to one end of a pull rope, and the other end of the pull rope is connected to a support rod provided on the sliding rod after passing through a guide ring provided on the guide frame.

[0006] Based on the above, the edges of the upper sealing plate and the lower sealing plate are provided with rubber skins for fitting with the side walls of the shaft; the upper sealing plate is also provided with a gas concentration sensor electrically connected to the controller.

[0007] According to the method for using the underground coal seam gas efficient extraction device, it is characterized in that: Step 1: First, set the gas concentration extraction threshold through the controller, and then extend the device into the shaft. Stop after each advancement. The controller controls the telescopic end of the electric push rod to extend, and the conical head pushes the resistance block, so that the sliding rod moves toward the side wall of the shaft, and then the rock-breaking nails penetrate into the coal rock on the side wall of the shaft, and the sealing head blocks the air hole at the same time; Step 2: Start the extraction machine to extract the gas in the coal seam, and the gas concentration sensor monitors the gas concentration between the upper sealing plate and the lower sealing plate in real time; Step 3: When the gas concentration is lower than the set concentration range, the gas extraction in the coal seam between the upper sealing plate and the lower sealing plate is completed; Step 4: At this time, the telescopic end of the electric push rod is controlled to retract, and under the tension of the tension spring 1, the baffle moves closer to the lifting tube, and the rock-breaking screw is pulled out from the coal rock.

[0008] The present invention has outstanding substantive features and significant progress compared to the prior art. Specifically, the present invention has the following advantages: The present invention provides an efficient underground coal seam gas extraction device and a method of using the same, which facilitates the segment-by-segment extraction of gas in the coal seam and facilitates the monitoring of the residual gas concentration in the coal seam, thereby ensuring efficient extraction of coal seam gas while saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0010] Figure 2 yes Figure 1 Schematic diagram of the structure at point A in the middle.

[0011] Figure 3 yes Figure 1 Schematic diagram of the structure at point B in the middle.

[0012] In the figure: 1. Coal seam; 2. Shaft; 3. Lifting pipe; 4. Upper sealing plate; 5. Lower sealing plate; 6. Rubber skin; 7. Extraction pipe; 8. Guide frame; 9. Support rod; 10. Sliding rod; 11. Resistance block; 12. Baffle; 13. Tension spring 1; 14. Electric push rod; 15. Conical head; 16. Base plate; 17. Rock breaking nail; 18. Sealing head; 19. Gas concentration sensor; 20. Lifting plate; 21. Guide rod; 22. Tension spring 2; 23. Pull rope; 24. Guide ring; 25. Support rod; 26. Extraction machine; 27. Controller. DETAILED DESCRIPTION

[0013] The technical solution of the present invention is further described in detail below through specific implementation methods. Example

[0014] like Figure 1-3 As shown, the present invention provides an underground coal seam gas efficient extraction device, comprising a coal seam 1 and a shaft 2 opened in the coal seam 1, wherein the shaft 2 is provided with a lifting pipe 3 and an extraction pipe 7, and the shaft 2 is provided with an upper sealing plate 4 and a lower sealing plate 5, wherein the lifting pipe 3 passes through the upper sealing plate 4 and is fixedly connected thereto, and the bottom end of the lifting pipe 3 is fixedly connected to the lower sealing plate 5, and air holes are provided on the upper sealing plate 4 and the lower sealing plate 5; the lifting pipe 3 and the extraction pipe 7 are extended to the outside of the shaft 2, the top end of the extraction pipe 7 is connected to the extraction machine 26, and the bottom end of the extraction pipe 7 passes through the upper sealing plate 4 and extends between the upper sealing plate 4 and the lower sealing plate 5; an electric push rod 14 is provided on the lower sealing plate 5 at a position corresponding to the axis of the lifting pipe 3, and a conical head 15 is provided at the telescopic end of the electric push rod 14, and a plurality of guide frames 8 are provided circumferentially on the outside of the lifting pipe 3 The guide frame 8 is fixed on the lifting tube 3 through a support rod 9. A sliding rod 10 with a square cross-section is slidably provided on the guide frame 8. The sliding rod 10 passes through the lifting tube 3. One end of the sliding rod 10 located in the lifting tube 3 is provided with a resistance block 11 that fits the conical head 15. The other end of the sliding rod 10 is provided with a base plate 16. The base plate 16 is provided with a plurality of rock-breaking nails 17 for breaking the coal and rock on the side wall of the shaft 2. A baffle 12 is also provided on the sliding rod 10. A tension spring 13 is sleeved on the sliding rod 10. The two ends of the tension spring 13 are respectively in contact with the baffle 12 and the guide frame 8; the upper sealing plate 4 and the lower sealing plate 5 are both provided with sealing components for the air vents, and the sealing components are associated with one of the guide frames 8; the extraction machine 26 and the electric push rod 14 are electrically connected to the controller 27 arranged outside the shaft 2.

[0015] The above-mentioned sealing assembly includes a plurality of guide rods 21 fixedly mounted on the upper sealing plate 4 or the lower sealing plate 5, a lifting plate 20 is slidably mounted on the guide rods 21, a sealing head 18 for the air vent is mounted on the lifting plate 20, and a tension spring 22 for applying tension to the lifting plate 20 is sleeved on the guide rods 21; the sealing head 18 is connected to one end of a pull rope 23, and the other end of the pull rope 23 is connected to a support rod 25 mounted on the slide rod after passing through a guide ring 24 mounted on the guide frame 8.

[0016] To ensure extraction efficiency, the edges of the upper sealing plate 4 and the lower sealing plate 5 are provided with rubber skins 6 for fitting with the side walls of the shaft 2 ; the upper sealing plate 4 is also provided with a gas concentration sensor 19 electrically connected to the controller 27 .

[0017] According to the method for using the underground coal seam gas efficient extraction device, it is characterized in that: Step 1: First, the gas concentration extraction threshold is set through the controller 27, and then the device is extended into the shaft 2. Each time it is advanced for a certain distance, it stops. The controller 27 controls the telescopic end of the electric push rod 14 to extend, and the conical head 15 pushes the resistance block 11, so that the sliding rod 10 moves toward the side wall of the shaft 2, and then the rock-breaking nail 17 penetrates into the coal rock on the side wall of the shaft 2, and the sealing head 18 blocks the air hole. Step 2: Start the extraction machine 26 to extract the gas in the coal seam 1, and the gas concentration sensor 19 monitors the gas concentration between the upper sealing plate 4 and the lower sealing plate 5 in real time; Step 3: When the gas concentration is lower than the set concentration range, the gas extraction in the coal seam 1 between the upper sealing plate 4 and the lower sealing plate 5 is completed; Step 4: At this time, the telescopic end of the electric push rod 14 is controlled to retract, and under the tension of the tension spring 13, the baffle 12 moves closer to the lifting tube 3, and the rock-breaking screw 17 is pulled out from the coal rock.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. An underground coal seam gas efficient extraction device, characterized in that: The invention comprises a coal seam (1) and a shaft (2) opened in the coal seam (1), wherein the shaft (2) is provided with a lifting pipe (3) and a pumping pipe (7), wherein an upper sealing plate (4) and a lower sealing plate (5) are provided in the shaft (2), wherein the lifting pipe (3) passes through the upper sealing plate (4) and is fixedly connected thereto, wherein the bottom end of the lifting pipe (3) is fixedly connected to the lower sealing plate (5), and air holes are provided on the upper sealing plate (4) and the lower sealing plate (5); wherein the lifting pipe (3) and the pumping pipe (7) are provided with air holes; ... ) are extended to the outside of the shaft (2), the top end of the extraction pipe (7) is connected to the extraction machine (26), and the bottom end of the extraction pipe (7) passes through the upper sealing plate (4) and extends between the upper sealing plate (4) and the lower sealing plate (5); an electric push rod (14) is provided on the lower sealing plate (5) at a position corresponding to the axis of the lifting pipe (3), and a conical head (15) is provided at the telescopic end of the electric push rod (14); a plurality of guide frames (8) are provided on the outside of the lifting pipe (3) along the circumferential direction, and the guide frames (8) are connected to the lifting pipe (3) through the guide frames (8). A support rod (9) is fixed on the lifting tube (3), and a sliding rod (10) with a square cross section is slidably provided on the guide frame (8). The sliding rod (10) passes through the lifting tube (3), and one end of the sliding rod (10) located in the lifting tube (3) is provided with a resistance block (11) that fits the conical head (15). The other end of the sliding rod (10) is provided with a base plate (16), and the base plate (16) is provided with a plurality of rock breaking nails (17) for breaking the coal and rock on the side wall of the shaft (2). The sliding rod (1 0) is also provided with a baffle (12), and a tension spring (13) is sleeved on the sliding rod (10), and the two ends of the tension spring (13) are respectively in contact with the baffle (12) and the guide frame (8); the upper sealing plate (4) and the lower sealing plate (5) are both provided with a sealing component for the air vent, and the sealing component is associated with one of the guide frames (8); the extraction machine (26) and the electric push rod (14) are electrically connected to a controller (27) arranged outside the shaft (2).

2. The underground coal seam gas efficient extraction device according to claim 1 is characterized in that: The sealing assembly comprises a plurality of guide rods (21) fixedly mounted on the upper sealing plate (4) or the lower sealing plate (5); a lifting plate (20) is slidably mounted on the guide rods (21); a sealing head (18) for the air vent is mounted on the lifting plate (20); and a tension spring (22) for applying tension to the lifting plate (20) is sleeved on the guide rods (21); the sealing head (18) is connected to one end of a pull rope (23); and the other end of the pull rope (23) is connected to a support rod (25) mounted on the slide rod after passing through a guide ring (24) mounted on the guide frame (8).

3. The underground coal seam gas efficient extraction device according to claim 2 is characterized in that: The edges of the upper sealing plate (4) and the lower sealing plate (5) are provided with rubber skins (6) for fitting with the side walls of the shaft (2); the upper sealing plate (4) is also provided with a gas concentration sensor (19) electrically connected to the controller (27).

4. The method for using the underground coal seam gas efficient extraction device according to claim 3 is characterized by: Step 1: First, the gas concentration extraction threshold is set through the controller (27), and then the device is extended into the shaft (2). After each advancement, the device stops and the telescopic end of the electric push rod (14) is controlled by the controller (27) to extend, and the conical head (15) pushes the abutment block (11), so that the sliding rod (10) moves toward the side wall of the shaft (2), and then the rock-breaking screw (17) penetrates into the coal rock on the side wall of the shaft (2), and at the same time, the sealing head (18) blocks the air vent; Step 2: Start the extraction machine (26) to extract the gas in the coal seam (1), and the gas concentration sensor (19) monitors the gas concentration between the upper sealing plate (4) and the lower sealing plate (5) in real time; Step 3: When the gas concentration is lower than the set concentration range, the gas extraction in the coal seam (1) between the upper sealing plate (4) and the lower sealing plate (5) is completed; Step 4: At this time, the telescopic end of the electric push rod (14) is controlled to retract, and under the tension of the tension spring 1 (13), the baffle (12) moves closer to the lifting tube (3), and the rock-breaking screw (17) is pulled out from the coal rock.

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