Underground gasification method for section protection coal pillar of coal mine

Abstract

The invention discloses an underground gasification method for a section protection coal pillar of a coal mine. The method comprises the following steps of (1) supporting a haulage roadway of a previous section, and building a cement wall in the haulage roadway; (2) supporting an air return roadway of a next section, and building a cement wall in the air return roadway; (3) punching a hole at theleft end part of the section protection coal pillar; (4) performing ignition at the left end part of the section protection coal pillar; (5) conveying oxidant gas to the section protection coal pillarthrough the air return roadway of the next section; (6) producing coal gas through taking physical and chemical reaction on an oxidant in the section protection coal pillar; (7) enabling generated gas to enter a mining area haulage rise through the haulage roadway of the previous section; (8) enabling the generated gas to enter an air return main roadway through the mining area haulage rise; and(9) enabling the generated gas to enter an air shaft to be collected through the air return main roadway. An original roadway during coal mining is used as a gasification passage; difficult-to-mine section protection coal pillars are directly gasified; a novel idea is provided for mining of the section protection coal pillar; and a novel method is provided for underground gasification of the coalmine.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to an underground gasification method for protecting coal pillars in coal mine sections. Background technique [0002] The total reserves of coal resources in my country are relatively large, but our country has a large population, and the per capita possession of coal resources is very small, and our country is a country rich in coal, poor in oil and little in gas. For now, coal resources still occupy a dominant position in our country. With the mining of coal resources, the conditions of coal mining in my country are becoming more and more complicated. At present, in the same mining area, multiple sections are often divided. In order to ensure that the next section is not affected by the mining of the previous section, a protective coal pillar is often left between the two sections. If the section protective coal pillars are mined out by conventional methods, the overlying str...

AI Technical Summary

Problems solved by technology

This is essentially a new mining system, with a large amount of engineering, high cost, long infrastructure construction period, and the exploration of site conditions is often not clear enough, which is easily affected by geological structures

At present, most of them are used as my country's strategic reserve technology, and it is difficult to achieve quick profits

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