高瓦斯回采工作面瓦斯超限治理

Treatment and Control of Over Limited Gas Content in High Gassy Coal Mining Face

介绍了芦岭煤矿高瓦斯回采工作面瓦斯超限治理的经验。

Abstract Coal seams in Lulin Coal Mine of Huibei Coal Mining Administration have a high gas content and a poor permeability. No. 8 and No. 9 seams have a high potential outburst. An inclined slicing strike longwall mining, a caving method and a mine shaft and multiple level development are adopted for the mine. The mine ventilation method of the mine is a mixture draw ventilation from central, east wing and west wing. During the coal production, there are a great amount of gas out from seams. The coal seams have a poor permeability and are hard to be drained. The gas content in the coal mining faces are often over the gas limitation point which are a great danger to the mine coal production. There are two factors caused over the gas limitation point. One is that the seam has a high gas content and a high gas emission. The other is that due to the coal mining pressure influence, a cross-section of a return airway in a coal mining face is too small, a ventilation resistance is high and a ventilation leakage in the coal mining face is high. The following measures are the resolutions to the problems. First is to drill bore holes in the face floor for gas drainage. Second is to drill bore holes along the seam for gas drainage. Third is that the U type ventilation should be improved to be a U type ventilation with tail gate ventilation. Fourth is to have a surface gas drainage from the goaf area. With above measures, the gas content over limitation point has been solved.