近距离煤层下分层采空区煤自燃危险区域分布规律

Distribution Law of Spontaneous Combustion Hazard of Coal in Lower Goaf of Close Distance Coal Seams

针对新维煤矿8104综采工作面开采煤层含硫量较高且局部富集、采空区遗煤多、距离上层采空区近等客观情况,研究了其采空区煤自燃危险区域分布规律。实施过程中,采用束管监测系统实时测试采空区气体场分布,在此基础上以O2浓度变化作为主要标志、温度变化为辅助标志划分了8104综采工作面采空区的"三带"范围,并采用数值模拟方式与现场实测结果进行了对比分析,结果表明实测与数值模拟结果基本一致。最终确定了该综采工作面采空区自燃带范围:进风侧为40.5~95.5 m,回风侧为15.3~59.7 m。

In view of the objective conditions of high sulfur content and local enrichment,large amount of residual coal and closing to upper goaf of coal seams in the 8104 fully mechanized coal mining face of Xinwei Coal Mine,the distribution law of coal spontaneous combustion danger zone in goaf is studied.In the implementation process,we used beam tube monitoring system to test the gas field distribution in the goaf in real time.On this basis,“three zones”of the goaf of the 8104 fully mechanized mining face are divided by taking O2 concentration change as the main index and the temperature change as the auxiliary index,and the numerical simulation method is used to compare and analyze the field test result.The result shows that the measured results are consistent with the numerical simulation results.Finally,the range of spontaneous combustion zone in the goaf of the fully mechanized mining face was determined:40.5 m to 95.5 m on the inlet side and 15.3 m to 59.7 m on the return side.