Gas control method for return airflow corner of coalmine coal working face

Abstract

The invention discloses a gas control method for a return airflow corner of a coalmine coal working face; the gas control method comprises the steps of laying a main drawing-out pipe in a return air roadway in advance and laying a drawing-out branch pipe with a butterfly valve, which corresponds to a connection roadway; the control process comprises the following steps of: A. closing the connection roadway and the return air roadway when the working face is pushed forward to an entrance of the connection roadway; B. laying a wind tunnel from a closing part of the return air roadway to a closing part of the connection roadway in a penetrating manner; and drawing out gas of the return airflow corner by using the wind tunnel; and C. opening a butterfly valve on a drawing-out branch pipe of a connection roadway previous to the connection roadway in the step A for drawing out gas. According to the gas control method, the gas concentration of the return airflow corner of the working face can be effectively reduced, the difficult problem of the gas control on the return airflow corner of the high-yield and high-efficiency working face is effectively solved, and the safety operating environment of the working face is greatly improved.

Description

technical field [0001] The invention relates to the technical field of coal mining in coal mines, in particular to a method for controlling gas at the return air corner of a coal mining working face. Background technique [0002] At present, the gas control measures for the return air corner of the coal mining face mainly include the following: [0003] 1) Set up wind curtains to guide wind flow. When the gas concentration in the upper corner of the coal mining working face is not too high, wind curtains or wooden boards are installed near the upper corner of the working face to force a part of the air flow to pass through the upper corner to discharge the accumulated gas. [0004] 2) Fan exclusion method. The fan exhaust method can be divided into hydraulic fans, electric local fans and ejectors according to the different power sources, but the principle and arrangement method are the same. The accumulated gas is flushed and taken away. [0005] 3) Increase the air volu...

AI Technical Summary

Problems solved by technology

[0010] In view of this, the purpose of the present invention is to provide a gas control method for the return air corner of the coal mining face in a coal mine, which can effectively solve the problem of excessive gas in the return air corner of the coal mining face in high-yield and high-efficiency mines

Images