A Safe and Clean Ventilation System Applicable to the Mining Face of the Roof Cutting and Pressure Relief 110 Method

Abstract

The invention discloses a safe and clean ventilating system suitable for a top cutting pressure relief construction method 110 mining working face. The safe and clean ventilating system comprises a mining area air return downhill roadway and a mining area belt downhill roadway, the right wing recovery working face is arranged on the right side of the mining area belt downhill roadway, a right boundary track downhill roadway is arranged on a mining area right boundary position, a mine is provided with a track main roadway, a belt main roadway and a total air return way, the mining area belt downhill roadway is communicated with the belt main roadway, the right boundary track downhill roadway is communicated with the track main roadway, and the mining area air return downhill roadway is communicated with the total air return way; the right wing recovery working face comprises a recovery-completed working face, an in-mining working face and a to-be-mined working face, when mining of the in-mining working face is performed, the mining area belt downhill roadway is sequentially communicated with a first air inlet roadway of the in-mining working face, the recovery working face, an air return roadway and the mining area air return downhill roadway, and the right boundary track downhill roadway is communicated with a second air inlet roadway. The safe and clean ventilating system canreduce air leakage of a gob region, improve the working environment and eliminate corner gas accumulation.

Description

technical field [0001] The invention belongs to the technical field of mining by the 110 method of roof cutting and pressure relief in coal mines, and in particular relates to a safe and clean ventilation system suitable for mining working faces by the 110 method of roof cutting and pressure relief. Background technique [0002] In the process of coal mining, the traditional wall and pillar coal mining methods need to dig a large number of roadways to ensure mine ventilation and material transportation. In order to protect the roadway and prevent the roadway from collapsing, a large number of coal pillars need to be reserved in the planning of the working face. As a result, a large amount of coal resources are left underground, and the recovery rate of underground coal mines is often only 50%-70%. The existence of underground coal pillars leads to the waste of a large amount of coal resources and the increase of mining costs. Use is extremely disadvantageous. [0003] In or...

AI Technical Summary

Problems solved by technology

Since the side roadway wall of the left roadway close to the goaf is composed of collapsed gravel, if it is used as a return air roadway, since the extraction ventilation system is mostly used in the mine, the air pressure in the return air roadway is lower than that in the air inlet roadway, so the air pressure in the air return roadway will be lower than that in the air inlet roadway. The air pressure of the working face will be significantly lower than that of the working face. Under the action of the air pressure difference, the air flow at the working face will easily flow through the gob and escape from the entryway, which will increase the degree of air leakage in the goaf, thus increasing the risk of spontaneous combustion of coal remaining in the gob. At the same time, the escaping air flow carries toxic and harmful gases in the goaf, causing the concentration of toxic and harmful gases in the entry to exceed the limit. In addition, the air leakage will easily lead to insufficient air volume at the working face

[0004] At present, the "Y-shaped" ventilation system is mostly used in the mining face of the 110 construction method, that is, the two parallel grooves of the working face are the air inlet lanes, and the roadway left behind the working face is used as the return air lane. The disaster gas exceeds the limit, but there are also certain hidden dangers. First, because the underground ventilation method is adopted, the initial entry retaining point is the lowest point of potential energy of the working face, and the corner of the working face is a high potential energy area. There is a certain pressure difference in the air pressure, and the side of the roadway near the goaf side is composed of collapsed coal and rock blocks, which has a certain air leakage channel, which makes the system have a certain risk of air leakage; After the working face is pushed forward, because the collapsed coal and rock mass of the roof is blocked and supported, the gangue supporting personnel are always in the return air flow of the working face, the dust concentration in the working area is high, and the working environment is harsh, which has a certain impact on the health of the personnel. influences

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