Goaf gas collection zone partition extraction method

Abstract

The invention relates to a goaf gas collection zone partition extraction method. The technology used includes the following steps that an upper corner area of a fully-mechanized face is separated froma goaf through isolation walls; the isolation walls are built by regarding anchoring cables as frameworks and by waste materials such as underground gangue, and is sprayed with airtight spraying materials; as a working face advances, the isolation walls are arranged at intervals, and an air returning side gas collection zone in the goaf is divided into several isolation zones; in isolation areasfrom the working face into the goaf phase; nogs are arranged to assist and support top plates; extraction main pipes arranged in air returning lanes are divided into a plurality of extraction side pipes which are correspondingly connected into each partition, simultaneous extraction in the goaf air returning side deep portion and upper corner surrounding areas are achieved, and gas over-limit caused by a large amount of high concentration gas gathering in an upper corner is avoided; and when new isolation walls are set up and the extraction side pipes are can enter the goaf, a plurality of holes are correspondingly distributed on the extraction pipes, the extraction air inlet area is increased, and the extraction amount is increased.

Description

technical field [0001] The invention relates to a coal mine gas extraction method, in particular to a partition extraction method for the goaf gas collection zone at the upper corner of the fully mechanized mining working face and the deep part of the return air side of the goaf. Background technique [0002] In recent years, with the development of large-scale and intensified mines, the advancing speed of working faces has accelerated, and the amount of gas emitted from mines has increased sharply. Coal mine gas disasters have become a key factor restricting the safe and efficient mining of mines. During the recovery process of the fully mechanized mining face, the accumulation of gas in the upper corner has always been a difficult problem in the gas control of the fully mechanized mining face. The existing drainage method is only a simple buried pipe drainage in the upper corner, which cannot effectively solve the problem that a large amount of high-concentration gas in th...

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Problems solved by technology

During the recovery process of the fully mechanized mining face, the accumulation of gas in the upper corner has always been a difficult problem for gas control in the fully mechanized mining face, and the frequent excess of gas in the upper corner has caused serious safety hazards

The existing drainage method is only a simple buried pipe drainage in the upper corner, which cannot effectively solve the problem that a large amount of high-concentration gas in the gob gathers to the upper corner under the action of ventilation, causing the gas in the upper corner to frequently exceed the limit, and even return to the air. Roadway gas overrun

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