A ventilation and dust removal device for a high-gas coal mine tunneling working face

Abstract

The present application relates to the field of ventilation of high-gas coal mine tunneling working face. A ventilation and dust removal device for high-gas coal mine tunneling working face comprises a supply air duct, a dust removal air duct, a air leakage device, a dust remover main machine, a dust blocking air curtain device, a dust remover supporting fan and an extraction fan. The dust removal air duct is connected to both ends of the dust remover main machine. The end of the dust removal air duct in the tunneling direction of the tunneling machine of the dust remover main machine is a second dust removal air duct, and the end of the dust removal air duct away from the tunneling direction of the tunneling machine of the dust remover main machine is a first dust removal air duct. The dust blocking air curtain device is arranged on the dust remover main machine. During operation, an air curtain that blocks dust from diffusing away from the tunneling direction of the tunneling machine is formed outside the dust blocking air curtain device and covers the cross section of the tunneling working face roadway. The air leakage device is installed on the supply air duct and is located on the side of the dust blocking air curtain device away from the tunneling direction of the tunneling machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ventilation of a high-gas coal mine tunneling working face. BACKGROUND

[0002] High-gas coal mine tunneling working face ventilation and dust removal need to consider gas dilution and dust control, and a comprehensive technical solution needs to be adopted. The core ventilation mode includes long-pressure short-extraction mixed ventilation and wall-attached air duct dust control. Long-pressure short-extraction mixed ventilation, the pressure-in type fan is arranged at the air inlet side of the roadway to provide fresh air flow to dilute gas; the extraction type dust removal fan is installed at the air return side, 3-5 meters away from the working face; the pressure-in air volume needs to be greater than the dust removal air volume by 20-30%, to avoid circulating air and ensure that gas does not accumulate; the pressure-in air duct end is 4-5 meters away from the working face, and the dust removal air duct is 3 meters away from the face, to form effective air flow coverage. Wall-attached air duct dust control, the pressure-in type wall-attached air duct is used, the axial air volume directly blows to the working face to prevent gas accumulation, and the radial air volume forms a dust separation air curtain, to improve the dust control efficiency by more than 30%; the axial-radial air outlet ratio of the wall-attached air duct is recommended to be 1:3, the radial air volume accounts for more than 80%, and the pressure-extraction ratio is controlled to be less than 75%.

[0003] Due to the need for gas control, the air supply volume of a high-gas mine tunneling working face is large, and the air supply outlet is close to the face. The existing dust removal equipment is insufficient in air suction volume due to space limitations, and cannot suck the dust at the face into the treatment, so that most of the dust generated by the cutting of the tunneling equipment is blown to the rear of the roadway by the air flow, the dust removal effect of the tunneling roadway is poor, the professional health of the mine workers is affected, and the tunneling efficiency is affected due to poor visibility. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a ventilation and dust removal device for a high-gas coal mine tunneling working face, to improve the dust removal efficiency of a high-gas tunneling roadway.

[0005] The technical scheme adopted by the present application is: a ventilation and dust removal device for a high-gas coal mine tunneling working face, comprising a supply air duct (9), a dust removal air duct, a air leakage device (3), a dust remover host (4), a dust blocking air curtain device (5), a dust remover supporting fan (2) and an extraction fan (8), the dust removal air duct is connected at both ends of the dust remover host (4), the end of the dust removal air duct in the tunneling direction of the tunneling machine of the dust remover host (4) is a second dust removal air duct (7), and the end of the dust removal air duct away from the tunneling direction of the tunneling machine of the dust remover host (4) is a first dust removal air duct (1); the dust blocking air curtain device (5) is arranged on the dust remover host (4), and an air curtain (6) that blocks the diffusion of dust away from the tunneling direction of the tunneling machine is formed outside the dust blocking air curtain device (5) during the working process; the air leakage device (3) is installed on the supply air duct (9) and on the side of the dust blocking air curtain device (5) away from the tunneling direction of the tunneling machine, the air leakage device (3) divides the air supply of the supply air duct (9) into three parts, the first part is the axial air Q 压3 blown to the tunneling working face in the supply air duct (9), the second part is Q 压2 blown to the tunneling direction of the tunneling machine outside the supply air duct (9), and the third part is Q 压1 blown to the direction away from the tunneling direction of the tunneling machine outside the supply air duct (9); the extraction fan (8) is connected to the second dust removal air duct (7), and the dust remover supporting fan (2) is connected to the first dust removal air duct (1).

[0006] The air leakage device (existing device) is a key component of the ventilation system of a high-gas mine, mainly used for adjusting the local ventilation air pressure and air volume, ensuring the safety of gas discharge and reducing the dust concentration. By adjusting the opening degree to control the air volume output, the local ventilation fan outlet air pressure is reduced. When the working face gas concentration exceeds the limit, the pressure relief port is opened to reduce the head-on air volume, and the fresh air flow in the pressure relief section is used to dilute the return air flow gas, so that the concentration is ensured to be ≤1.5%.

[0007] The dust remover host (existing device) is the core equipment of the coal mine dust removal system, and its design needs to meet the requirements of explosion-proof, high-efficiency filtration and adaptation to complex underground working conditions.

[0008] Q 压2 Minimum air speed V requirement: V≧0.25 m / s for coal roadway and semi-coal rock roadway, and V≧0.15 m / s for rock roadway.

[0009] The dust blocking air curtain device (5) comprises a left group and a right group of side blowing pipes (51) in communication with each other, an upper group of upper blowing pipes (52) and a lower group of lower blowing pipes (55), a compressed air interface (53) is arranged on the upper blowing pipe (52),

[0010] The side blowing pipe (51), the upper blowing pipe (52) and the lower blowing pipe (55) are provided with a plurality of nozzles (54) of different angles. When compressed air is connected to the compressed air interface (53), the compressed air is blown from each nozzle (54) to the tunnel of the tunneling face to form an air curtain (6) covering a cross section of the tunneling face for blocking dust diffusion.

[0011] The dust collector main machine (4) is connected with the second dust removal air duct (7) at one end of the diffusion type dust suction port (41), and the second dust removal air duct (7) is connected with the dust collector main machine (4) at one end of the inverted conical air outlet (71). The inverted conical air outlet (71) and the diffusion type dust suction port (41) are arranged close to each other but not directly connected.

[0012] The distance from the dust blocking air curtain device (5) to the air leakage device (3) is 1-2 times A ½ , wherein A is the cross-sectional area of the tunnel of the tunneling face.

[0013] In order to maximize the dust control in the dust blocking air curtain (air curtain) to the tunneling face, the space of the section of the tunnel should be in a negative pressure state, that is, the dust removal air volume Q 吸 in the section of the tunnel is greater than the air supply air volume Q 压3 . The air volume required for air pressure balance in the section of the tunnel is automatically supplemented by the Q 压1 of the air leakage device.

[0014] Q 压 =Q 压1 +Q 压2 +Q 压3 ;

[0015] Q 压3 ≧ the minimum required air volume of the tunneling face (determined by the mine according to the needs of gas control);

[0016] In order to ensure that the dust is controlled in the dust blocking air curtain to the tunneling face, Q 吸 ≧Q 压3 ;

[0017] In order to ensure that the air speed in the overlapping section between the air leakage device and the air outlet of the dust collector meets the minimum air speed requirement, Q 压 -Q 吸 =Q 压1 ≧V×A, A: cross-sectional area of the tunnel, V: minimum air speed requirement of the tunnel, V≧0.25 m / s for a coal tunnel and a semi-coal rock tunnel, and V≧0.15 m / s for a rock tunnel.

[0018] The beneficial effects of this invention are as follows: In order to maximize the dust removal air volume, in addition to the original dust collector's matching fan, an exhaust fan is arranged at the face of the dust collector. The exhaust section of the exhaust fan is connected to the second dust removal duct, and an inverted cone-shaped exhaust port is designed at the end of the dust removal duct. It is arranged close to but not directly connected to the inlet diffusion-type dust suction port of the dust collector. While ensuring that the two exhaust fans can work independently and normally, the dust removal air volume is maximized within the limited space of the tunnel.

[0019] A dust-blocking air curtain device is designed around the main dust collector to form an air curtain that basically covers the cross-section of the roadway, preventing dust from spreading backward. By designing an air vent on the air supply duct and ensuring that the dust collection suction volume is greater than the air supply volume at the face, a negative pressure state is maintained in the section from the air curtain to the face, so that the dust is controlled within the air curtain to the face and does not spread backward into the roadway, achieving efficient dust removal in the roadway behind the tunnel in high-gas mines. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is an isometric view of the air venting device of the present invention;

[0022] Figure 3 This is an isometric view of the dust-blocking air curtain device of the present invention;

[0023] Figure 4 This is a schematic diagram of the air curtain of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection between the dust removal duct and the dust collector main unit of the present invention;

[0025] Among them, 1. First dust removal duct, 2. Dust collector matching fan, 3. Air venting device, 4. Dust collector main unit, 5. Dust-blocking air curtain device, 6. Air curtain, 7. Second dust removal duct, 8. Exhaust fan, 9. Air supply duct, 31. Radial air outlet, 32. Handle, 33. Air valve, 34. Axial air distribution port, 41. Diffusion type dust suction port, 51. Side blow pipe, 52. Upper blow pipe, 53. Compressed air interface, 54. Nozzle, 55. Lower blow pipe, 71. Inverted cone-shaped air outlet. Detailed Implementation

[0026] like Figure 1 As shown, a ventilation and dust removal device for a high-gas coal mine tunneling face includes an air supply duct 9, a dust removal duct, an air venting device 3, a dust collector main unit 4, a dust curtain device 5, a dust collector matching fan 2, and an exhaust fan 8.

[0027] The ventilation duct 9 adopts existing technology for air supply in high-gas coal mine tunneling faces. The difference from existing technology is that a venting device 3 is installed on the ventilation duct 9, dividing it into two sections. For example... Figure 2 As shown, the ventilation device adopts existing technology and is a three-way valve with an internal damper 33. The axial air inlet is connected to the air supply duct, which is connected to the external air supply. The external air supply flow rate is Q. 压 The air supply duct connected to the axial air distribution port extends to the front of the tunneling working face, and the flow rate of the axial air distribution port is Q. 压3 The air coming out of the radial air outlet 31 is blown to both sides of the air supply duct at the radial air outlet, and the air volume blown towards the tunneling face is Q. 压1 The air volume on the other side is Q. 压2 .

[0028] The dust removal ducts are connected to both ends of the dust collector main unit 4. The end of the dust collector main unit 4 facing the tunneling direction of the tunneling machine is the second dust removal duct 7, and the end of the dust collector main unit 4 facing away from the tunneling direction of the tunneling machine is the first dust removal duct 1. The second dust removal duct 7 extends to the front of the tunneling working face, and the end of the second dust removal duct 7 is closer to the end of the roadway than the end of the air supply duct 9.

[0029] like Figure 5 As shown, the end of the dust collector main unit 4 connected to the second dust collection duct 7 is a diffusion-type dust suction port 41, and the end of the second dust collection duct 7 connected to the dust collector main unit 4 is an inverted cone-shaped air outlet 71. The inverted cone-shaped air outlet 71 and the diffusion-type dust suction port 41 are arranged close to each other but not directly connected. In order to increase the dust collection air volume in the limited space of the roadway, an exhaust fan 8 is added near the head. The exhaust fan 8 is connected to the dust collection duct 7. The end of the dust collection duct 7 is designed as an inverted cone-shaped air outlet 71, and the dust collector air intake is designed as a diffusion-type dust suction port 41. The inverted cone-shaped air outlet 71 and the diffusion-type dust suction port 41 are arranged close to each other but not directly connected. Under the premise that both the exhaust fan 8 and the dust collector matching fan 2 can work normally independently, the dust sucked in by the exhaust fan 8 can enter the dust collector 4 for purification under the negative pressure of the dust collector matching fan 2. If the inverted cone-shaped air outlet 71 and the diffuser-type dust suction port 41 are directly connected, the dust removal air volume will increase significantly. However, the aerodynamic performance of the two fans (exhaust fan and dust collector matching fan) affects each other, which can easily lead to failure.

[0030] The dust-blocking air curtain device 5 is arranged on the dust collector main unit 4. During operation, an air curtain 6 is formed on the outside of the dust-blocking air curtain device 5, which covers the cross-section of the tunnel face and blocks dust from spreading away from the tunneling direction of the tunneling machine.

[0031] like Figure 3 and 4As shown, the dust blocking air curtain device 5 includes a left and right group of side blowing pipes 51, an upper group of upper blowing pipes 52, and a lower group of lower blowing pipes 55, which are communicated with each other. The compressed air interface 53 is arranged on the upper blowing pipe 52. A plurality of nozzles 54 of different angles are arranged on the side blowing pipes 51, the upper blowing pipes 52 and the lower blowing pipes 55. In use, after the compressed air is connected to the compressed air interface 53, the compressed air is blown from each nozzle (54) to the tunnel of the tunneling face, forming an air curtain 6 covering a cross section of the tunnel of the tunneling face for blocking the dust diffusion.

[0032] The air leakage device 3 is installed on the air supply wind pipe 9 and is located on the side of the dust blocking air curtain device 5 away from the tunneling direction of the tunneling machine. The distance from the dust blocking air curtain device 5 to the air leakage device 3 is 1-2 times of A ½ , wherein the A is the cross section area of the tunnel of the tunneling face. Too large or too small distance from the dust blocking air curtain device 5 to the air leakage device 3 will affect the ventilation efficiency.

[0033] The air leakage device 3 divides the air supply of the air supply wind pipe 9 into three parts. The first part is the axial air Q 压3 in the air supply wind pipe 9 blowing to the tunneling face, the second part is Q 压2 outside the air supply wind pipe 9 blowing to the tunneling direction of the tunneling machine, and the third part is Q 压1 outside the air supply wind pipe 9 blowing to the direction away from the tunneling direction of the tunneling machine. The extraction fan 8 is connected to the second dust removal wind pipe 7, and the dust remover supporting fan 2 is connected to the first dust removal wind pipe 1.

[0034] Q 压2 Minimum air speed V requirement: V≧0.25 m / s in coal roadway and semi-coal rock roadway, and V≧0.15 m / s in rock roadway.

[0035] In order to maximize the dust control in the dust blocking air curtain (air curtain) to the tunneling face, the space of the section of the tunnel should be in a negative pressure state, that is, the dust removal air volume Q 吸 in the section of the tunnel is greater than the air supply volume Q 压3 . The air volume required for the air pressure balance in the section of the tunnel is automatically supplemented by the Q 压1 of the air leakage device through the gap of the dust blocking air curtain.

[0036] Q 压 =Q 压1 +Q 压2 +Q 压3 ;

[0037] Q 压3 ≧ the minimum required air volume of the tunneling face (determined by the mine according to the needs of gas control);

[0038] In order to ensure that the dust is controlled in the dust blocking air curtain to the tunneling face, Q 吸 ≧Q 压3 ;

[0039] To ensure that the wind speed of the coinciding section between the air leakage device and the air outlet of the dust collector meets the minimum wind speed requirement, Q 压 -Q 吸 =Q 压1 ≧V×A, A: roadway cross-sectional area (cross-sectional area), V: minimum wind speed requirement of the roadway, V≧0.25 m / s for coal roadway and semi-coal rock roadway, and V≧0.15 m / s for rock roadway.

Claims

1. A ventilation and dust removal device for a high-gas coal mine tunneling working face, characterized in that: The dust removal device comprises a wind supply duct (9), a dust removal duct, a wind leakage device (3), a dust remover main machine (4), a dust blocking air curtain device (5), a dust remover auxiliary fan (2) and an extraction fan (8). The dust removal duct is connected to both ends of the dust remover main machine (4). The second dust removal duct (7) is located at the end of the dust remover main machine (4) in the heading direction of the heading machine. The first dust removal duct (1) is located at the end of the dust remover main machine (4) away from the heading direction of the heading machine. The dust blocking air curtain device (5) is arranged on the dust remover main machine (4). During the working process, an air curtain (6) that blocks the diffusion of dust away from the heading direction of the heading machine is formed outside the dust blocking air curtain device (5) and covers the cross section of the heading working face. The wind leakage device (3) is installed on the wind supply duct (9) and located on the side of the dust blocking air curtain device (5) away from the heading direction of the heading machine. The wind leakage device (3) divides the air supply of the wind supply duct (9) into three parts. The first part is the axial air Q 压3 supplied to the heading working face in the wind supply duct (9). The second part is the air Q 压2 supplied to the heading direction of the heading machine outside the wind supply duct (9). The third part is the air Q 压1 supplied to the direction away from the heading direction of the heading machine outside the wind supply duct (9). The extraction fan (8) is connected to the second dust removal duct (7). The dust remover auxiliary fan (2) is connected to the first dust removal duct (1).

2. The ventilation and dust removal device for the high-gas coal mine tunneling working face according to claim 1, characterized in that: Q 压2 Minimum air velocity V required: V≧0.25 m / s for coal roadway and half coal and rock roadway, V≧0.15 m / s for rock roadway.

3. The ventilation and dust removal device for the high-gas coal mine tunneling working face according to claim 1, characterized in that: The dust blocking air curtain device (5) comprises a left and right group of side blowing pipes (51), an upper group of upper blowing pipes (52), and a lower group of lower blowing pipes (55), and a compressed air interface (53) is arranged on the upper blowing pipe (52), The side blowing pipe (51), the upper blowing pipe (52) and the lower blowing pipe (55) are each arranged with a plurality of nozzles (54) of different angles, and when in use, compressed air is connected to the compressed air interface (53), and then the compressed air is blown from each nozzle (54) to the tunnel of the tunneling working face, so as to form an air curtain (6) covering a cross section of the tunneling working face for blocking dust diffusion.

4. The ventilation and dust removal device for the high-gas coal mine tunneling working face according to claim 1, characterized in that: One end of the dust collector main machine (4) connected with the second dust removal air duct (7) is a diffusion type dust suction port (41), one end of the second dust removal air duct (7) connected with the dust collector main machine (4) is a reverse tapered air outlet (71), and the reverse tapered air outlet (71) and the diffusion type dust suction port (41) are arranged close to each other but not directly connected.

5. The ventilation and dust removal device for the high-gas coal mine tunneling working face according to claim 1, characterized in that: The distance between the dust blocking air curtain device (5) and the air leakage device (3) is 1-2 times of A ½ , wherein A is the cross-sectional area of the roadway of the tunneling working face.

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