| With the development of the coal mining technology and the increase of mining depth, the coal mine gas accident occurred frequently in our country, coal mine gas prevention and control of become the top priority of coal mine safety production, the key coal mine in our country has more than 300 of gas mine, there are local to varying degrees and the local gas accumulation roadway.the problem, especially the working face return air Angle, its gas accumulation and gas overrun problem is more serious.Thesis research object is the prudential BaoDe coal mine 81503 working face, the 81503 working face of geological structure condition, the gas concentration distribution rule and gas causes natural factors and mining technology are analyzed. According to 81503 working face of return air corner gas accumulation problem, this paper in the collection of a large number of references and field investigation through consulting a large number of references, and on the basis of the previous research achievements of people as the foundation, summarizes the return corner gas control present situation, through theoretical analysis and field observation data, and using numerical simulation software FLUENT in goaf, the working face, and return air corner gas migration regularity and a numerical simulation of the wind pressure of no wind disturbance and has two cases to make numerical simulation of the disturbance of air curtain.Finally gives the prudential coal mine 81503 face return corner gas accumulation problem prevention and control measures. Thesis research preserved BaoDe coal mine 81503 face gas prediction, monitoring and prevention and control work has an important guiding role, innovative use of air curtain fan is presented to control return corner roadway.the problem for 81503 face gas prevention and control work has laid a certain foundation. In addition the operation of this scheme is simple, low cost, good effect, has the very high application promotion value. |
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