工作面Y型通风方式下采空区瓦斯与煤自燃耦合分析

Coupling Analysis of Gas and Coal Spontaneous Combustion in Goaf under Y-type Ventilation Mode in Working Face

为有效解决工作面上隅角瓦斯超限问题,采用数值模拟、现场试验等方法,分析采空区瓦斯与煤自燃关系及规律。一定范围内风量的增加可显著降低采空区瓦斯体积分数,工作面风速或推进速度增加均可降低采空区遗煤自然发火期,而采空区氧化带范围随着瓦斯抽采流量的增加而增加。数值模拟和现场应用结果表明,采用Y型通风及埋管抽采可有效解决马兰矿10604工作面上隅角瓦斯超限和遗煤自燃问题。

In order to effectively solve the problem of gas overrun in the upper corner of the working face,the relationship and law between gas and coal spontaneous combustion in goaf are analyzed by means of numerical simulation and field test.The increase of air volume in a certain range can significantly reduce the gas volume fraction in the goaf.The increase of wind speed or propulsion speed in the working face can reduce the natural ignition period of the residual coal in the goaf,and the range of oxidation zone in the goaf increases with the increase of gas extraction flow.The results of numerical simulation and field application show that Y-type ventilation and buried pipe extraction can effectively solve the problems of gas overrun and coal spontaneous combustion in the upper corner of 10604 working face in Malan Mine.