Gob-side entry retaining rear roadway goaf buried pipe gas extraction system under W-shaped ventilation mode

Abstract

The utility model discloses a pipe-buried gas extraction system for a gob-side entry retaining rear roadway goaf in a W-shaped ventilation mode. The gas extraction system comprises an air return roadway extraction pipe arranged in an air return roadway, a gas collection box and a rear roadway extraction pipe, wherein the gas collection box and the rear roadway extraction pipe are arranged in a rear roadway. An extraction hose and three extraction pipes are respectively communicated with the top of the collection gas tank, the extraction hose extends into the air return way and is communicated with the extraction pipe of the air return way, and the three extraction pipes respectively extend to a to-be-extracted area of a goaf. According to the utility model, the gas concentration at the air flow convergence position under the two-inlet and one-return W-shaped ventilation mode can be effectively reduced, the safety production of a coal mine is ensured, and the popularization and the use are convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to coal mine gas extraction technical field, concretely relates to a kind of W type ventilation mode under along empty lane lane goaf pipe-buried gas extraction system. BACKGROUND

[0002] Along empty lane is to maintain original recovery roadway along the edge of goaf behind coal mining face, and through certain technical means, the crossheading of last recovery working face is re-supported to leave for the use of next adjacent recovery working face, so that the protective coal pillar in traditional coal mining mode is avoided, coal resources are maximally recovered, coal loss is avoided, and the economic benefit of mine is improved.

[0003] Along empty lane coal pillarless mining technology has been applied in many thin and medium thick coal seam mining faces in China, and good results have been achieved. After using along empty lane technology, the ventilation mode of recovery working face changes, and Y type or W type ventilation mode is often used. Under two-in-one-out W type ventilation mode, the gas migration law of goaf changes, and gas is easy to gather in the roadway airflow convergence place, i.e.

[0004] Therefore, how to reduce the gas concentration in the airflow convergence place of goaf and ensure the safety of coal mine production is a problem to be solved. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of W type ventilation mode under along empty lane lane goaf pipe-buried gas extraction system, which can effectively reduce the gas concentration in the airflow convergence place under two-in-one-out W type ventilation mode and ensure the safety of coal mine production.

[0006] To solve the above technical problems, the utility model adopts the technical scheme that:

[0007] A kind of W type ventilation mode under along empty roadway gob area buried pipe gas extraction system, the W type ventilation mode is formed by first air inlet lane, second air inlet lane, air return lane and rear lane communication;The first air inlet lane is located at the side of stoping working face away from adjacent standby mining working face, the second air inlet lane is located at the side of adjacent standby mining working face away from stoping working face, the air return lane is located between stoping working face and adjacent standby mining working face, the rear lane is located between adjacent standby mining working face and goaf, and hydraulic support is arranged between the goaf and stoping working face, and the goaf is also sprayed with sealing material;The gas extraction system includes air return lane extraction pipe arranged in air return lane, and collection gas tank and rear lane extraction pipe arranged in rear lane respectively;The top of collection gas tank is respectively communicated with extraction hose and three extraction pipes, the extraction hose extends to air return lane and is communicated with air return lane extraction pipe, and the three extraction pipes extend to goaf area to be extracted respectively.

[0008] Preferably, the first extraction pipe of the three extraction pipes is buried in the rear of the hydraulic support, the second extraction pipe is buried 3 meters behind the hydraulic support, and the third extraction pipe is arranged 7 meters behind the hydraulic support.

[0009] Preferably, the three extraction pipes each include a hose, a pipe and a flower pipe communicated in sequence;Three hoses are respectively communicated with the collection gas tank, and three pipes and flower pipes extend into the goaf.

[0010] Preferably, the aperture of the extraction hose is 108 mm, the aperture of the air return lane extraction pipe and the rear lane extraction pipe is 377 mm, and the aperture of the flower pipe is 75 mm.

[0011] Preferably, the negative pressure of the extraction hose during extraction is not higher than 5 kPa, and the flow rate is not higher than 100 m 3 / min.

[0012] Preferably, the air return lane extraction pipe includes a fourth air return lane extraction pipe and a fifth air return lane extraction pipe, the fourth air return lane extraction pipe and the fifth air return lane extraction pipe are connected by flanges, one end of the fourth air return lane extraction pipe is provided with an extraction pipe blind plate, and the extraction hose is communicated with the extraction pipe blind plate.

[0013] Preferably, the rear lane extraction pipe includes a first rear lane extraction pipe, a second rear lane extraction pipe and a third rear lane extraction pipe communicated in sequence from right to left.

[0014] The utility model has the following advantages compared with prior art:

[0015] The utility model discloses a kind of W-type ventilation mode undergroud gas extraction system of gob area of following roadway along gob, by the way of two-inlet-back W-type ventilation and gob area buried pipe gas extraction along gob combination, effectively reduce the gas concentration of two-inlet-one-back type ventilation mode underflow convergence;Through processing blind plate and buried pipe equipment connection, it does not affect the extraction pipeline connection of 377mm extraction pipe and borehole in return airway, also will not affect the change of 377mm extraction pipe in return airway: several φ75mm hoses can be flexibly adjusted in quantity by gas collection tank, change gob area buried pipe gas extraction area.

[0016] The technical scheme of the utility model will be described in further detail below with the drawings and examples. DRAWINGS

[0017] Figure 1 It is working face W-type ventilation mode schematic diagram of the utility model;

[0018] Figure 2 It is gas extraction system structure schematic diagram of example 1 of the utility model;

[0019] Figure 3 It is gas extraction system structure schematic diagram of example 2 of the utility model.

[0020] 1-first air inlet lane;2-mining working face;3-return airway extraction pipe;4-adjacent preparatory working face;5-flange;6-extraction pipe blind plate;7-extraction hose;8-gas collection tank;9-hose;10-solid pipe;11-flower pipe;12-gob;13-hydraulic support;14-three-way;18-back roadway extraction pipe. DETAILED DESCRIPTION

[0021] As Figure 1 Shown, it is the technology of cutting along gob and leaving roadway in the process of coal mining, and adjacent preparatory working face 4 has formed, and two-inlet-one-back W-type ventilation mode is used.The W-type ventilation mode is formed by first air inlet lane 1, second air inlet lane, return airway and back roadway communication;The first air inlet lane 1 is located on the side of mining working face 2 away from adjacent preparatory working face 4, the second air inlet lane is located on the side of adjacent preparatory working face 4 away from mining working face 2, the return airway is located between mining working face 2 and adjacent preparatory working face 4, the back roadway is located between adjacent preparatory working face 4 and gob 12, hydraulic support 13 is arranged between gob 12 and mining working face 2, and closed material is sprayed in gob 12.Influenced by the change of ventilation mode and the lag of back roadway spraying closed material, gas is easy to gather at the two-inlet flow convergence of hydraulic support 13, causes gas concentration overrun, and threatens coal mine safety production.

[0022] In order to solve the problem that gas is easy to gather at the confluence of two inflows of hydraulic support 13 under W type ventilation mode, gas concentration is over limit, and coal mine safety production is threatened, the application provides a gas extraction system for gob area buried pipe under W type ventilation mode along gob roadway.

[0023] participate Figure 2 As shown in the figure, the gas extraction system comprises a return airway extraction pipe 3 arranged in the return airway, and a collection gas tank 8 and a rear roadway extraction pipe 18 arranged in the rear roadway respectively; the top of the collection gas tank 8 is respectively communicated with an extraction hose 7 and three extraction pipes, the extraction hose 7 extends to the return airway 16 and is communicated with the return airway extraction pipe 3, and the three extraction pipes extend to the extraction area of the gob area 12 respectively.

[0024] It should be noted that the return airway extraction pipe 3 in the return airway and the rear roadway extraction pipe 18 in the rear roadway must be sealed perfectly.

[0025] In specific implementation, the first extraction pipe of the three extraction pipes is buried at the rear of the hydraulic support 13, the second extraction pipe is buried at the rear 3 meters of the hydraulic support 13, and the third extraction pipe is buried at the rear 7 meters of the hydraulic support 13, so as to divide the gas into three extraction areas for extraction.

[0026] In specific implementation, the three extraction pipes all comprise a hose 9, a real pipe 10 and a flower pipe 11 communicated in sequence; the three hoses 9 are respectively communicated with the collection gas tank 8, and the real pipes 10 and the flower pipes 11 all extend into the gob area 12.

[0027] In specific implementation, the aperture of the extraction hose 7 is 108mm, the apertures of the return airway extraction pipe 3 and the rear roadway extraction pipe 18 are 377mm, and the aperture of the flower pipe 11 is 75mm. In specific implementation, the negative pressure of the extraction hose 7 in the extraction process is not higher than 5kPa, and the flow is not higher than 100m 3 / min.

[0028] In specific implementation, the return airway extraction pipe 3 comprises a fourth return airway extraction pipe and a fifth return airway extraction pipe, the fourth return airway extraction pipe and the fifth return airway extraction pipe are connected through a flange 5, one end of the fourth return airway extraction pipe is provided with an extraction pipe blind plate 6, and the extraction hose 7 is communicated with the extraction pipe blind plate 6.

[0029] In specific implementation, the rear roadway extraction pipe 18 comprises a first rear roadway extraction pipe, a second rear roadway extraction pipe and a third rear roadway extraction pipe communicated in sequence from right to left.

[0030] Embodiment 1

[0031] As Figure 2As shown, the goaf 12 behind the hydraulic support 13 is buried with pipes, the first extraction pipe is buried behind the hydraulic support 13, the second extraction pipe is buried 3 meters behind the hydraulic support 13, and the third extraction pipe is buried 7 meters behind the hydraulic support 13, so as to extract gas in three extraction areas. One end of the extraction hose 7 is connected to the extraction pipe blind plate 6 of the extraction pipe 3 of the return airway and connected to the gas extraction pipe system, and the other end is connected to the gas collection tank 8. Three hoses 9 are connected to the gas collection tank 8, each hose 9 is connected to a solid pipe 10 and a flower pipe 11, and the flower pipe 11 and the solid pipe 10 are stretched into the goaf 12 from the top of the rear lane. During the extraction process, the negative pressure of the extraction pipe 7 is not higher than 5kPa, and the flow is not higher than 100m 3 / min.

[0032] Example 2

[0033] As Figure 3 shown, with the advance of the recovery working face 2, the fourth return airway extraction pipe in the return airway needs to be disassembled and connected to the rear lane extraction pipe 18 in the rear lane, which is used for gas extraction during the later recovery of the adjacent standby recovery working face 4. If the extraction effect of the three extraction areas is good and continuous with the advance of the recovery working face 2, the fifth return airway extraction pipe is connected by the extraction hose 7, the gas collection tank 8 is connected to the tee joint 14 of the rear lane extraction pipe 18 by another extraction hose 7, and the gas extraction in the three extraction areas is continued; if the extraction effect of the three areas is poor, the extraction hose 7 and the gas collection tank 8 are moved forward as a whole, and the extraction pipe is buried again, as Figure 2 shown, the goaf gas extraction is carried out, and the process is repeated. During the process, the number of hoses 9 drawn from the gas collection tank 8 and the range of the extraction area can be adjusted according to the actual situation on site.

[0034] The above is only a preferred embodiment of the present application, and does not limit the present application in any way. Any simple modification, change and equivalent structural change of the above embodiment according to the technical essence of the present application are still within the protection scope of the technical solution of the present application.

Claims

1. A kind of W type ventilation mode along empty lane behind lane goaf pipe gas extraction system, the W type ventilation mode is formed by first air inlet lane, second air inlet lane, air return lane and rear lane communication;The first air inlet lane is located in the side of recovery working face away from adjacent reserve mining working face (4), the second air inlet lane is located in the side of adjacent reserve mining working face (4) away from recovery working face (2), the air return lane is located between recovery working face (2) and adjacent reserve mining working face (4), the rear lane is located between adjacent reserve mining working face (4) and goaf (12), the goaf (12) is equipped with hydraulic support (13) between recovery working face (2), and in goaf (12) still spray with sealing material, it is characterized in that: The gas extraction system comprises a return airway extraction pipe (3) arranged in the return airway, and a gas collection tank (8) and a back alley extraction pipe (18) arranged in the back alley respectively; the top of the gas collection tank (8) is respectively communicated with an extraction hose (7) and three extraction pipes, the extraction hose (7) extends to the return airway (16) and is communicated with the return airway extraction pipe (3), and the three extraction pipes extend to the goaf (12) to be extracted respectively.

2. The gas extraction system for buried pipes in the gob area of the rear roadway along the gob in the W-type ventilation mode according to claim 1, characterized in that: The first extraction pipe of the three extraction pipes is buried at the rear of the hydraulic support (13), the second extraction pipe is buried at the rear of the hydraulic support (13) for 3 meters, and the third extraction pipe is buried at the rear of the hydraulic support (13) for 7 meters.

3. The gas extraction system according to claim 2, wherein the system is characterized in that: The three extraction pipes all comprise a hose (9), a solid pipe (10) and a flower pipe (11) communicated in sequence; the three hoses (9) are communicated with the gas collection tank (8) respectively, and the three solid pipes (10) and flower pipes (11) all extend into the goaf (12).

4. The gas extraction system for buried pipes in the gob area of the rear roadway of the gob-side entry driving in the W-type ventilation mode according to claim 3, characterized in that: The aperture of the extraction hose (7) is 108mm, the apertures of the return airway extraction pipe (3) and the back alley extraction pipe (18) are 377mm, and the aperture of the flower pipe (11) is 75mm.

5. The gas extraction system according to claim 4, wherein the gas extraction system is a system for extracting gas from a gob area of a post- laneway along an airway in a W-type ventilation mode. The negative pressure of the extraction hose (7) during extraction is not higher than 5 kPa, and the flow is not higher than 100 m 3 / min.

6. The gas extraction system according to claim 1, wherein the system is used in a W-type ventilation mode. The return airway extraction pipe (3) comprises a fourth return airway extraction pipe and a fifth return airway extraction pipe, the fourth return airway extraction pipe and the fifth return airway extraction pipe are connected through a flange (5), one end of the fourth return airway extraction pipe is provided with an extraction pipe blind plate (6), and the extraction hose (7) is communicated with the extraction pipe blind plate (6).

7. The gas extraction system according to claim 1, wherein the system is used in a W-type ventilation mode. The back alley extraction pipe (18) comprises a first back alley extraction pipe, a second back alley extraction pipe and a third back alley extraction pipe communicated in sequence from right to left.

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