综放工作面瓦斯积聚影响因素模拟研究
Numerical Simulation Study on Influence Factors of Gas Accumulation at Fully Mechanized Caving Face
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摘要: 为解决综放工作面瓦斯易超限问题,获取采煤工艺的合理参数,提高工作效率。以余吾煤业N2105工作面为研究对象,依据无化学反应的单相多组分扩散理论,建立了综放工作面瓦斯扩散数学模型。运用fluent软件,对影响工作面瓦斯积聚的工作面风速、煤层瓦斯可解吸量、工作面推进速度、煤层回采率、围岩瓦斯涌出量等因素进行数值模拟研究。结果表明:工作面平均风速在3 m/s、煤层瓦斯可解吸量不超过4 m3/t、工作面推进速度不大于4.8 m/d、放煤回采率大于95%、围岩瓦斯涌出量不超过10 m3/min时,防止工作面瓦斯积聚效果最佳。Abstract: The study aims at solving the problem of gas overrun in super long fully mechanized caving face, obtaining the reasonable parameters of the mining process and improving the working efficiency. Taking N2015 working face of Yuwu Coal Industry as the research object, a mathematical model of gas diffusion in fully mechanized caving face is established on the basis of the Fluent modeling software, a numerical study is carried out on the parameters, which can result in the gas accumulation, such as gas velocity, the recovery rate of surrounding rock, gas emission and other factors. It is concluded that if the following conditions can be satisfied, i.e. average wind speed is 3 m/s at working face, coal seam gas desorption is less than 4 m3/t, the speed of working face is not greater than 4.8 m/d, the coal mining rate is more than 95% and the surrounding gas emission is less than 10 m3/min, the best effect of preventing gas accumulation can be achieved.
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