砚北煤矿特厚易自燃煤层邻近采空区瓦斯抽采与煤自燃耦合研究  

Coupling study of gas extraction and coal spontaneous combustion in goaf adjacent to extra-thick spontaneous combustion coal seam in Yanbei Coal Mine

作　　者：慕兰兰 传金平 杨小彬[1] 聂朝刚 MU Lanlan;CHUAN Jinping;YANG Xiaobin;NIE Chaogang(School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Yanbei Coal Mine,Huating Coal Industry Group Co.,Ltd.,Huating 744105,China)

机构地区：[1]中国矿业大学(北京)应急管理与安全工程学院,北京100083 [2]华亭煤业公司砚北煤矿,甘肃华亭744105

出　　处：《矿业安全与环保》2023年第1期25-36,共12页Mining Safety & Environmental Protection

摘　　要：砚北煤矿特厚易自燃煤层采用分层开采,在工作面推进过程中因周期来压造成工作面上隅角瓦斯瞬时超限,目前主要通过瓦斯抽采解决该问题,但邻近采空区抽采易引起采空区漏风,可能导致遗煤及下分层煤发生自燃。为分析采空区瓦斯抽采对遗煤自燃的影响及优化抽采参数,编制了瓦斯抽采、漏风、氧化升温耦合脚本文件,建立了邻近采空区瓦斯抽采耦合氧化升温数值计算模型,并利用该模型模拟了不同抽采条件下邻近采空区瓦斯浓度分布、温度分布及氧气浓度分布规律,综合考虑抽采效率和防止煤氧化自燃,研究结果表明:抽采钻孔高度35 m、抽采负压7 kPa时瓦斯抽采效果最佳。研究结果可为特厚易自燃煤层工作面上隅角瓦斯治理及邻近采空区瓦斯抽采设计提供技术参考。The slicing method is applied to the extra-thick spontaneous combustion coal seam in Yanbei Coal Mine. In the process of advancing the working face, the gas in the corner of the working face instantaneously exceeds the limit due to periodic weighting. At present, the problem is mainly solved by gas extraction, but gas extraction near the goaf is easy to cause air leakage in goaf, which may leads to spontaneous combustion of residual coal and coal in the lower layer. In order to analyze the influence of gas extraction in goaf on spontaneous combustion of left coal and optimize the extraction parameters, the coupled script file of gas extraction, air leakage and oxidation temperature rise was compiled. The numerical calculation model of coupled oxidation temperature rise of gas extraction in adjacent goaf was established, and the distribution law of gas concentration, temperature and oxygen concentration in adjacent goaf under different extraction conditions was simulated by this model, considering the extraction efficiency and the prevention of coal oxidation spontaneous combustion. The results show that the best extraction effect is obtained when the height of the hole is 35 m and the negative pressure is 7 kPa. The research results can provide technical reference for gas control in corner of working face and gas extraction design in adjacent goaf of extra-thick spontaneous combustion coal seam.

关 键 词：特厚煤层 邻近采空区 瓦斯抽采 遗煤自燃 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全] TD752.2