Dust-fall method for coal body in extra-thick fully-mechanized caving face through high-pressure water injection

Abstract

The invention relates to a dust-fall method for coal mining, in particular to a dust-fall method for a coal body in an extra-thick fully-mechanized caving face through high-pressure water injection. By adoption of the dust-fall method, the problem of lacking a method for controlling dust concentration in the process of mining the coal body in the extra-thick fully-mechanized caving face is solved. According to the scheme, the dust-fall method comprises the following steps that a, after a stope working face is circled, water injection holes are drilled in an inlet air forward groove and a return air forward groove of the stope working face, and included angles between the water injection holes and the forward grooves are 90 degree; b, the water injection holes are sealed through hole packers; and c, water is injected into the water injection holes through a water injection pump. The dust-fall method for the coal body in the extra-thick fully-mechanized caving face through high-pressure water injection has the advantages that (1) through water injection of the coal body in the extra-thick fully-mechanized caving face, dust production is eliminated from the source to the maximum extent, and thus the dust rate of the stope working face is effectively reduced; (2) through water injection of the coal body in the extra-thick fully-mechanized caving face, the temperature of the coal body in the stope range is effectively decreased and the spontaneous combustion control effect is obvious; and (3) the drilled water injection holes are arranged and designed reasonably, operation is easy, construction is convenient, and the dust-fall effect is remarkable.

Description

technical field [0001] The invention relates to a method for reducing dust in coal mine mining, in particular to a method for reducing dust by high-pressure water injection into a coal body in an extra-thick fully mechanized caving face. Background technique [0002] Fine coal dust in coal mines is one of the five natural disasters in mines. Coal dust is extremely harmful. It not only pollutes the working environment, affects the health of miners, and can cause miners to suffer from pneumoconiosis; when the concentration of coal dust and oxygen concentration reach A coal dust explosion can occur when there is a certain limit and an open flame, which is very harmful. Especially in modern high-yield and high-efficiency large-scale mines, fully mechanized caving back mining is commonly used in extra-thick coal seams, and the amount of coal dust generated during coal cutting and caving is as high as 1000-2000mg / m 3 . In this regard, after a lot of research at home and abroad, ...

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Problems solved by technology

[0003] The invention solves the current problem of lack of methods for controlling the dust concentration during coal mining of extra-thick fully mechanized caving faces, and provides a method for high-pressure water injection and dust reduction of coal bodies of extra-thick fully mechanized caving faces

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