Method for cleaning coal powder at sealing section of gas extraction drill hole

Abstract

The invention discloses a method for cleaning coal powder at a sealing section of a gas extraction drill hole. A coal mine underground compressed air system is utilized and connected with a gas injection pipe, so that the gas injection pipe can better blow the coal powder in a sealing area; a gas inlet of a gas suction pipe is matched with a nozzle of the gas injection pipe, the blown coal powdercan be sucked to the maximum extent, the coal powder enters a coal powder storage tank through the gas suction pipe, and water mist can be in contact with the coal powder quickly and wrap the surfaceof the coal powder; meanwhile, under the action of liquid nitrogen mist, the water mist on the surface of the coal powder is condensed quickly, the descending speed of the coal powder is increased, and the coal powder is enabled to settle to the bottom of the coal powder storage tank quickly; and a device for cleaning residual coal powder in the sealing section of the gas extraction drill hole canmove in the gas extraction drill hole, so that the coal powder at all positions in the drill hole is cleaned. Therefore, the method has the advantages of being good in coal powder cleaning effect andhigh in efficiency; and meanwhile, in the cleaning process, the dust cannot affect the roadway operation environment, air leakage after drill hole sealing can be reduced, the gas extraction effect isimproved, and wide practicability is achieved.

Description

technical field

[0001] The invention relates to a method for cleaning residual coal powder in a borehole, in particular to a method for cleaning coal powder in the sealing section of a gas drainage borehole. Background technique

[0002] The sealing quality of boreholes for underground gas drainage in coal mines is one of the important factors that determine the effect of drilling gas extraction. Field investigations found that if a large amount of coal powder remains in the sealing section of gas drainage drilling, the possible consequences are as follows Aspects: ①The pulverized coal in the borehole hinders the normal insertion of the sealing device, and when there is too much pulverized coal, it may even cause the sealing device to fail to insert into the designated position; The space inside and outside the borehole forms an air guide channel, which greatly reduces the sealing quality of the borehole. The existing methods for cleaning the drilled coal powder mainly incl...

Examples

Embodiment Construction

[0016] The present invention will be further described below.

[0017] Such as figure 1 Shown, concrete steps of the present invention are:

[0018] A. Install the device for cleaning the residual pulverized coal in the gas drainage drilling hole sealing section to the gas drainage drilling that needs to be cleaned, and connect one end of the gas injection pipe 4 to the underground compressed air system of the coal mine;

[0019] B. Open the fourth control valve 17, the centrifugal fan 18, the second control valve 11, the water mist generator 12, the third control valve 14 and the liquid nitrogen mist generator 15 in order, and the centrifugal fan 18 works to make the coal Negative pressure is generated in the powder storage tank and the suction pipe 9, and then the air in the sealed area enters the pulverized coal storage tank 19 through the suction pipe inlet 7; The water mist spray pipe transports the fine water mist into the pulverized coal storage tank 19, and the liqui...

technical field

[0001] The invention relates to a method for cleaning residual coal powder in a borehole, in particular to a method for cleaning coal powder in the sealing section of a gas drainage borehole. Background technique

[0002] The sealing quality of boreholes for underground gas drainage in coal mines is one of the important factors that determine the effect of drilling gas extraction. Field investigations found that if a large amount of coal powder remains in the sealing section of gas drainage drilling, the possible consequences are as follows Aspects: ①The pulverized coal in the borehole hinders the normal insertion of the sealing device, and when there is too much pulverized coal, it may even cause the sealing device to fail to insert into the designated position; The space inside and outside the borehole forms an air guide channel, which greatly reduces the sealing quality of the borehole. The existing methods for cleaning the drilled coal powder mainly incl...

Examples

Embodiment Construction

[0016] The present invention will be further described below.

[0017] Such as figure 1 Shown, concrete steps of the present invention are:

[0018] A. Install the device for cleaning the residual pulverized coal in the gas drainage drilling hole sealing section to the gas drainage drilling that needs to be cleaned, and connect one end of the gas injection pipe 4 to the underground compressed air system of the coal mine;

[0019] B. Open the fourth control valve 17, the centrifugal fan 18, the second control valve 11, the water mist generator 12, the third control valve 14 and the liquid nitrogen mist generator 15 in order, and the centrifugal fan 18 works to make the coal Negative pressure is generated in the powder storage tank and the suction pipe 9, and then the air in the sealed area enters the pulverized coal storage tank 19 through the suction pipe inlet 7; The water mist spray pipe transports the fine water mist into the pulverized coal storage tank 19, and the liqui...

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