Research and Application of Gas Prevention and Control Technology in Coal Mine Working Face
In response to the gas control technology used in the goaf of a certain mining face,which used to be connected tunnels and buried pipes for gas extraction,there are problems such as poor gas control effect and high construction cost.Design to replace the original buried pipe extraction technology with low negative pressure and large flow rate large-diameter drilling for extraction.Firstly,calculate the maximum gas emission in the adjacent layer through the source separation prediction method,which belongs to the key control category.And by analyzing the variation law of gas concentration in drilling and upper corner,it is determined that effective gas control can be achieved when the large diameter drilling hole diameter is 650 mm and the spacing is 30 m.
large diameter drillinggas controlhigh flow pumpingextraction capacity
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