高瓦斯矿井采空区瓦斯与遗煤自燃耦合灾害防控研究

Study on Prevention and Control of Gas and Residual Coal Spontaneous Combustion Coupling Disaster in Goaf of High Gas Mine

以乌兰煤矿Ⅱ020803工作面为背景,采用理论分析、数值模拟和现场实践等手段对采空区瓦斯与遗煤自燃耦合灾害防控进行研究,研究结果表明:瓦斯爆炸三角形区域主要位于工作面及沿空留巷区域,位于该区域混合气体浓度适宜,一旦遇到有足够能量的点火源时,就有可能发生爆炸。当同层位的采空区氧化带范围和可爆区域范围重合区域内遗煤发生氧化发应时,会使煤体及其周围温度升高,一旦超过CH4着火点温度时,就会发生瓦斯爆炸。采用高位瓦斯抽放与防灭火一体化钻孔及采空区动态隔离控制技术可使工作面隅角CO浓度、CH4浓度呈现下降趋势,可有效防控工作面瓦斯爆炸与煤自燃耦合灾害。

TakingⅡ020803 working face of coal mine as the background,the theoretical analysis,numerical simulation and field practice for gas and residual coal spontaneous combustion coupling disaster prevention and control in goaf are studied.The results show that the gas explosion triangle area is mainly located in the working face and the area along the goaf,and the mixed gas concentration in this area is suitable,and an explosion may occur when an ignition source of sufficient energy is encountered.When the oxidation reaction occurs in the area where the oxidation zone of goaf in the same layer and the explosion zone coincide,the temperature of the coal body and its surroundings will rise.Once the temperature exceeds the CH4 ignition point,a gas explosion will occur.The integration of high gas drainage and fire prevention drilling and the dynamic isolation control technology of goaf can make the CO concentration and CH4 concentration in the corner of the working face decrease,which can effectively prevent and control the coupling disaster of gas explosion and coal spontaneous combustion in the working face.