Residual coal full-mechanized repeated mining method of near-distance inflammable seam gob

Abstract

The invention provides a residual coal full-mechanized repeated mining method of a near-distance inflammable seam gob, which aims to solve the problem of resource loss, natural inflammation and gas discharge difficulty in mining a near-distance underlying seam above which a tool post gob covers. The method comprises the following steps that: upper coal covering pillars are put when a lower seam is mined; a staggered roadway arrangement method is adopted, i.e. an air inlet transportation roadway is arranged in an underlying seam, and tunneling along with the bottom is performed; an air return transportation roadway is arranged in an upper covering seam, and tunneling along with the top is performed; and a process procedure combining a mode that one upper coal covering pillar is put while mining for twice and a mode that one upper coal covering pillar is put while mining for one time is adopted in a working plane, i.e. when the whole seam is not mined, one upper coal covering pillar is put while mining for twice, and when the whole seam is mined in different layers, one upper coal covering pillar is put while mining for one time. With the adoption of the method, the recycling of residual coal is realized while new seams are mined, so that not only is the non-renewable coal resource saved, but also the service life of a mining well is prolonged, and the resource recycling efficiency is significantly improved.

Description

technical field [0001] The invention relates to a mining method, in particular to a fully mechanized caving and re-mining method for residual coal in goafs of short-distance combustible coal seams. Background technique [0002] Coal is the most important primary energy source in my country, and it is also a limited and non-renewable resource. For a long time, coal has accounted for more than 70% of my country's primary energy production and consumption, ensuring the rapid development of the national economy. Both the world's energy and China's energy demand will continue to grow in the next few decades. From the perspective of energy security and economic rationality, the domestic energy gap will mainly be solved by coal. This is determined by the objective conditions of my country's coal-rich, oil-scarce, and gas-poor resources. Even for the relatively abundant coal, my country's per capita share is only half of the world's average level, and the recovery rate of coal res...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of resource loss, spontaneous combustion and difficulty in gas discharge during the mining of the short-distance lower coal seam overlying the goaf of the knife column, and to provide a comprehensive method for residual coal in the goaf of the short-distance flammable coal seam. Putting and recovering method

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