A method for dynamic pressure water injection and dust reduction in fully mechanized mining in layers with gently inclined thick coal seams

Abstract

The invention discloses a method for dynamic pressure water injection and dust reduction on the working face of fully mechanized layered mining in a gently inclined thick coal seam, which comprises the following steps: respectively drilling out the belt machine along the groove and the return air along the groove according to the two sides of the coal seam, and putting the belt machine along the groove , The end of the air return chute is opened to connect to form a working face for comprehensive coal mining; holes are drilled at intervals in the belt conveyor chute and return air chute according to their length direction to drill the spaced dynamic pressure holes I, and Fill the dynamic pressure hole I with the interceptor I used to block the radial direction of the dynamic pressure hole I; according to the predetermined exhaust rules, inject safety gas into the dynamic pressure hole I through the interceptor I, and then pass through the interceptor I to release the safe gas Replace the dangerous gas in the dynamic pressure hole Ⅰ; according to the predetermined exhaust rules, the safety gas will fully open the gap to avoid the compaction effect caused by the pressure release after the dangerous gas is free; the dangerous gas and the safe gas are mixed to continuously and continuously Diluting its concentration greatly weakens the accumulation effect of dangerous gases.

Description

technical field [0001] The invention relates to the technical field of mine safety mining, in particular to a method for dynamic pressure water injection and dust reduction on working faces of fully mechanized layered mining of gently inclined thick coal seams. Background technique [0002] In order to solve the problem of large coal dust in the fully mechanized mining face of the hard roof in the thick coal seam, the traditional method is to install the belt conveyor along the trough and the return air trough of the fully mechanized mining face on the thick coal seam along the parallel working face in the coal seam. In the pre-drainage coal seam, the gas pressure is relieved in advance, and the gas extraction pipe is used as the water injection pipe for static pressure water injection. [0003] That is to say, the method of pumping and discharging the gas, but this method has disadvantages: [0004] 1. Bring compaction effect, compaction effect: when drilling holes for gas...

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Problems solved by technology

[0006] 3. Aggregation effect, the way of pumping and drainage concentrates the gas in the coal seam, thereby increasing the concentration of gas in the air, resulting in local gas accumulation that poses a safety threat

[0007] And the dust on the working face increases with the increase of the mining intensity. In addition to the water spraying and dust reduction during the normal coal cutting of the shearer, the coal wall breaks and falls when the water content of the coal seam is less than 4% and the thick coal seam is fully mechanized. coal dust, it is difficult to achieve the effect of dust reduction by watering with the usual shearer, and there are disadvantages:

[0008] 4. Traditional static pressure water injection cannot effectively infiltrate wet coal seams due to the above-mentioned problems of small pores and low permeability

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