The Ventilation Air Methane Technology Research In Fully Mechanized Caving Face Of Dahuangshan Mine

In recent years, with the coal industry to accelerate reforms and expand use, coal resource is becoming a more and more essential energy in human life, the country pays more and more attention to the development of the coal industry, and promulgated a series of laws and regulations to regulate all aspects of coal production, so can improve the safety of the coal industry, the situation of production safety of national coal industry has continued to improve. But through statistics of coal mine accident in recent years, we found the ratio of gas accident has been high, and becomes the key factor in mine safety production. Gas accident will not only cause casualties and property losses, but also pollute the environment. With mine mining depth increases, the amount of gas emission will also increase, coal mine gas prevention is imperative.This paper is based on the actual conditions of+735working face of Dahuangshan mine from Yuxin coal mine in Xinjiang, In view of the upper corner gas overrun problem sometimes occurs under the existing ventilation system, through a series of analysis, this paper puts forward the improvement direction on ventilation system to solve the gas overrun problem of+735working face, and further improve the gas drainage ability of the ventilation system of the working face. The main contents of this paper are as follows:First, on the basis of introduction of the laws of fluid flow in porous media and gas flow patterns in the coal, this paper analyzes the gas emission sources and characteristics of gas emission of fully mechanized caving goaf, and put forward the main factors influencing the goaf gas emission.Second, this paper introduces the existing mine gas control methods, and focus on the research of ventilation air methane by using the ventilation system, then theoretically analyzes the advantages and disadvantages of various ventilation system, and the ability of the ventilation system.Third, this paper introduces the general situation of Dahuangshan mine and+735working face, then studys the gas emission main source of+735working face and measures gas emission of coal wall and goaf, provides the basis for mining ventilation system improvement.Fourth, in order to study gas migration laws in goaf of different ventilation systems, through establishing the similar simulation model and observation and study of the tracer gas displacement law, we presented gas flow paths in goaf under each gas ventilation system, then visually analyzes the effectiveness and the advantages and disadvantages of controlling gas overrun problem under various ventilation system, with the actual situation of+735working face, we chooses "U+I" type ventilation system as the future improved direction. Fifth, when the cross end lane arranges at different heights under "U+I" type ventilation system, through the FLUENT numerical simulations of gas concentration distribution of end lane and air lane, then determines the optimum height of cross end lane of+735working face, so that the working face ventilation system can get best gas drainage effect.Through the research and analysis on ventilation system+735working face in Dahuangshan coal mine, this paper provides a solution ideas for the upper corner gas overrun problem, and improves the ability of ventilation air methane, Thus can ensuring the safe and efficient conduct of coal mining work.