Extraction device for extracting gas in old goaf of coal mine and extraction method thereof

Abstract

The invention discloses an extraction device for extracting gas in an old goaf of a coal mine and an extraction method thereof. The extraction device comprises a bottom frame, wherein first electric cylinders which are symmetrically distributed are clamped at the top end of the bottom frame in a sliding mode; a bottom plate is fixedly installed at the top ends of the first electric cylinders; lifting air cylinders are fixedly installed at the four corners of the top end of the bottom plate; a top frame is fixedly installed at the output ends of the lifting air cylinders; a second electric cylinder is clamped at the top end of the top frame in a sliding mode; a drill rod driving mechanism is vertically installed on one side of the output end of the second electric cylinder; a supporting bearing seat is vertically installed on one side, far away from the drill rod driving mechanism, of the output end of the second electric cylinder; and an extraction drill rod is detachably installed at the top of the supporting bearing seat. According to the extraction device, the extraction drill rod is arranged and is matched with an extraction assembly for use, so that the content of the gas is extracted and detected synchronously while stable drilling is carried out, and the extraction effect of the whole device on the gas is effectively improved.

Description

technical field [0001] The invention relates to the technical field of coal mine gas development and utilization, in particular to a gas extraction device and a extraction method for extracting gas from an old goaf in a coal mine. Background technique [0002] Coal seam gas is an associated product in the process of coal formation, most of which are stored in the coal seam in an adsorbed state. It is the main disaster source in the coal mine production process, and its main component CH4 is a relatively strong greenhouse gas, but it is also a clean energy source and high-quality chemical raw material. Therefore, the development and utilization of gas can not only make full use of underground resources, but also improve mine safety conditions and increase economic benefits. The greenhouse effect and so on are of great significance; after the coal mining face is closed, the gas that can be decompressed and desorbed within the mining influence range is called the old gob gas. ...

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Problems solved by technology

[0003]At present, for the gas extraction methods in the old goaf, most of them use drill pipes to drill holes in the extraction position first, and then use the extraction pump body to The gas in the hole is extracted and detected. This extraction method, the drilling operation and the extraction operation are carried out separately, which leads to a decrease in the gas extraction efficiency ratio and affects the subsequent mining progress of the coal mine. During drainage, the lack of protective components may easily lead to frictional heating between the drill pipe and the coal mine during drilling, resulting in gas explosion and low safety. Therefore, we propose a gas drainage system for the old goaf of the coal mine. Device and extraction method thereof are used to solve the above problems

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