Affiliation:
1. Liaoning Technical University
Abstract
Aimed at the comprehensive management of gas and spontaneous combustion in goaf of 5-2S fully mechanized caving face in five district of Hongmiao coal mine. The impacts on the air flow field and concentration distribution of the goaf are analyzed, that the changes of gas drainage value, and the location of drainage outlet as well as injection capacity of nitrogen. The results show that, the larger of the volume of gas drainage, the greater risk of gas explosion and spontaneous combustion. Appropriate increasing gas drainage volume is used to ensure the safety of the working face, with injecting nitrogen or accelerating the speed of face promote. The drainage outlet location should also be in an appropriate range (5~25 m) after the break line of the face. The result has important guiding significance in goaf of inflammable thick seam of gas mine, on the selection of gas extraction parameters, which is reasonable to prevent both gas explosion accident and spontaneous combustion caused by drainage excessive.
Publisher
Trans Tech Publications, Ltd.
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