基于上行开采方式的煤层群采空区自然发火规律研究  

Research on spontaneous combustion law in goaf of coal seam group based on upward mining method

作　　者：张大明[1] 刘康 张勋[1] ZHANG Daming;LIU Kang;ZHANG Xun(College of Mining,Liaoning Technical University,Fuxin Liaoning 123000,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《中国安全生产科学技术》2024年第10期67-72,共6页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(52074147)。

摘　　要：为了研究在上行开采方式下近距离煤层群采空区自然发火规律不清这一问题。采用数值模拟方法对开采煤层下方赋存1层采空区、2层采空区和3层采空区进行氧气运移情况和采空区遗煤自燃“三带”分布特征研究,从而研究出开采煤层采空区遗煤不会自然发火的工作面推进速度;结合国家能源集团宁夏煤业有限责任公司某煤矿煤层群上行开采3-2煤层实例,利用软件Comsol对其进行数值模拟,研究3-2煤层下部采空区漏风时,对采空区内遗煤自然发火的规律是否有影响。研究结果表明:当工作面推进速度大于3.17 m/d时,采空区遗煤不会自然发火。研究结果可为上行开采领域的采空区自然发火规律总结提供参考依据。In order to study the problem that the spontaneous combustion laws in goaf of close distance coal seam group under the upward mining method is unclear,the numerical simulation method was used to study the oxygen migration and the distribution characteristics of“three zones”for the spontaneous combustion of residual coal in goaf of the first layer goaf,the second layer goaf,and the third layer goaf under the mining coal seam.The advancement speed of working face that the residual coal in the goaf of mining coal seam will not occur the spontaneous combustion was studied.Combined with the case of upward mining of 3-2 coal seam in coal seam group of a coal mine of the National Energy Group Ningxia Coal Industry,the numerical simulation was carried out by using Comsol software,and this paper studies whether the air leakage in the lower part of 3-2 coal seam has any influence on the spontaneous ignition of the left coal in the goaf.The results show that when the advancement speed of working face is more than 3.17 m/d,the residual coal in the goaf will not occur the spontaneous combustion.The research results can provide a reference basis for summarizing the spontaneous combustion laws of goaf in the upward mining field.

关 键 词：上行开采 自然发火 Comsol数值模拟 气体运移 

分 类 号：X936[环境科学与工程—安全科学]