Super-large-diameter coal seam drilling pipe insertion goaf gas extraction technology

Abstract

The invention relates to a super-large-diameter coal seam drilling pipe insertion goaf gas extraction technology. The technology is characterized by the steps that a measure roadway is constructed behind protection coal pillars reserved on the side of a gas return roadway, a scraper conveyor is arranged on the measure roadway, multiple large-diameter drill holes are drilled from the protection coal pillars reserved in a coal seam to the corners of the gas return roadway through the measure roadway and a large-diameter spiral drilling machine, a drill hole casing pipe is inserted into each large-diameter drill hole, the drill hole casing pipes are connected with an extraction pipeline, and then gas extraction is conducted on the casing pipe; the measure roadway is set to be a gas inlet roadway of a next stoping face after being used, one roadway is used for two purposes, the construction amount of the protection coal pillar roadway is reduced, a roadway flow and a connection roadway are omitted, no collapse hole can occur due to usage of the drill hole casing pipes, a part of the drill hole casing pipes can be recycled and reused, and it is guaranteed that the gas dose not leak; meanwhile, investment is saved, management is easy, the extraction effect is improved, and complete mechanization of the whole coal mining engineering process and auxiliary process is achieved.

Description

technical field [0001] The invention relates to a process and method for gas drainage in a goaf, in particular to a technique for extracting gas in a goaf with a super-large-diameter coal seam borehole insertion pipe. Background technique [0002] Coal occupies a dominant position in my country's energy composition. However, the environment of coal production is extremely harsh, and major disasters and accidents occur frequently. Among them, the gas disaster is one of the main forms of coal mine disasters in my country. With the continuous improvement of fully mechanized mining technology, the advancing speed of the working face is accelerating, and higher and higher requirements are put forward for the gas control of the large fully mechanized mining face with high gas emission. From the perspective of gas sources, the proportion of goaf gas in the gas emission of working faces is increasing. In order to control the gas in working faces, some mines adopt multi-lane layout...

AI Technical Summary

Problems solved by technology

[0005] At present, when arranging the working face to extract gas from the goaf, the connection lane is often used to make the connection roadway, and the connection roadway is sealed, and the pipe is inserted for drainage. Since the connection river is built at a certain distance, the number is large, the amount of work is large, and the time angle of connection is large. In the process of drainage, the mine pressure is high, and the airtightness of the connection channel may be crushed, resulting in air leakage, and may even cause the gas in the adjacent drainage roadway to exceed the limit

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