煤矿采空区瓦斯抽放数值模拟研究

Numerical simulation study of gas drainage in mine goaf

查明不同抽采方案下采空区瓦斯抽放效果,能够为矿井瓦斯灾害防治提供一定的参考依据。基于气体流动的连续方程、动量方程和能量方程,建立了工作面瓦斯抽放模型,并应用FLUENT数值模拟软件,对工作面埋管抽放,埋管抽放与高位钻孔抽放,埋管抽放、高位钻孔与上隅角综合抽放3种方案的抽放效果进行模拟,结果表明:采用埋管抽放、高位钻孔与上隅角综合抽放时,工作面瓦斯浓度下降到1%以下,抽放效果最好。现场应用结果也表明,采用了综合抽放工作面瓦斯抽放率达到60%以上,回风巷瓦斯浓度超限得到了有效地控制,满足了安全生产的需要。

Different gas drainage effect provides reference for gas prevention and control. Based on continuous equations of gas flow, momentum equation and energy equation, gas drainage model was set up to simulate pipe buried drainage, pipe buried and high drilling drainage, pipe buried and high drainage with upper corner drainage, the result showed that the third drainage technology had the best drainage effect with gas content below 1%, gas drainage above 60%, gas out of limit got control in air return roadway, met the needs of safe mining.