紫金煤层采空区自燃“三带”分布规律研究

Research on the Distribution Law of the"Three Zones"of Spontaneous Combustion in the goaf of Zijin Coal Seam

本研究以紫金煤矿1203工作面为对象,以煤矿相关知识为理论指导,结合实验室实验测定的煤自燃特性参数,并现场布置温度与气体采集系统于运输巷与回风巷两侧,通过Fluent模拟方法对采空区风流速度等进行分析,划分工作面的自燃“三带”范围,同时推算出工作面的最低推进速度,为矿井安全生产提供了保障。研究结果表明:模拟结果散热带宽度约为11 m,自燃带宽度约为11~68 m,窒息带宽度大于68 m,与实测自燃“三带”基本相符。研究成果可为紫金煤层防治提供有效的科学依据,为相似煤矿的安全生产提供一定的参考。

This study takes the 1203 working face of Zijin Coal Mine as the object,guided by the relevant knowledge of coal mining as the theoretical guidance,combined with the coal spontaneous combustion characteristic parameters measured through laboratory experiments,and arranged temperature and gas collection systems on both sides of the transportation and return air tunnels.Through Fluent simulation method,the air flow velocity in the goaf was analyzed,and the"three zones"range of spontaneous combustion in the working face was divided.At the same time,the minimum advancing speed of the working face was calculated,Provided guarantee for safe production in mines.The research results indicate that the simulated width of the divergent zone is about 11m,the width of the spontaneous combustion zone is about 11~68m,and the width of the suffocation zone is greater than 68m,which is basically consistent with the measured"three zones"of spontaneous combustion.The research results can provide effective scientific basis for the prevention and control of the Zijin coal seam,and provide a certain reference for the safety production of similar coal mines.