Fully mechanized coal face high suction tunnel lower-returning drilling primary mining gas drainage method

Abstract

The present invention relates to a gas pumping and exchanging method of downward drilling hole high pumping lane with a comprehensive caving face used in gas initial pumping and exchanging, and aims to create a safe and simple working condition, to improve pumping and exchanging efficiency and to reduce the gas consistency of the working face efficiently; the present invention is to dig two or three drilling fields being suitable for drilling machine working at the place that the inner bottom plate of a trending high pumping lane is horizontally 0 to 50 meters being far away from the cutting lane; and two or three drilling holes are also need to be drilled; besides, towards the working face, the drilling machine can be used to drill downwards drilling holes which can replace the high pumping lane; the drilling holes can be drilled from the high pumping lane to reach the loading belt which is positioned above the working face and is newly developed during the initial mining period. The final drilling hole can be positioned in the angle of 70 degrees formed by the working face roof of the cutting lane and the roof of the coal seam and also can be positioned in the stratum as far as four and five times away from the working face; during the initial mining period, the trending high pumping lane is sealed in wall and pressed with iron tubes to connect with the main pumping and exchanging system; under the condition of high subpressure and through downward drilling holes, the gas lifted to the slit belt is pumped to the trending high pumping lane to enter into the pumping and exchanging system to reach the ground.

Description

technical field [0001] The invention relates to a method for treating primary mining gas drainage in a fully mechanized caving face, in particular to a method for drilling primary gas drainage in a high drainage roadway in a fully mechanized caving face. Background technique [0002] At present, the gas drainage is the fissure zone when the drilling of the high pumping roadway is drilled and the working face falls. The fissure zone is generally located at a position 8 to 15 times the mining height from the roof. No gas can be pumped through the fissures, and if it is lowered, there will be borehole collapse or high-pumped alleyway roof collapse, and gas cannot be pumped. Within 20 meters of the initial mining, the gas in the gob can be diluted by the wind flow and enter the return airway because the roof does not fall, and the gas in the working face does not exceed the limit. Falling, falling is not complete, the fracture zone moves down and begins to develop upwards, so t...

AI Technical Summary

Problems solved by technology

But with this method, the construction is difficult, the cost is high, the ventilation management is difficult, the gas is easy to accumulate, and there are potential safety hazards

At present, there is still a lack of a safe, effective, and low-cost method for gas drainage in the primary mining of fully mechanized caving faces

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