基于TDLAS的采空区煤自燃临界氧气体积分数与“三带”测定研究
Investigation of critical oxygen concentration and “three zones” of coal spontaneous combustion in goaf based on TDLAS
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摘要: 为了研究高瓦斯矿井厚煤层工作面煤自然发火规律,以亭南煤矿4号煤层302工作面为研究对象,基于程序升温实验和分布式激光检测气体系统的方法,对煤自燃氧化特征、临界氧气体积分数及采空区自燃“三带”规律进行分析,得到高瓦斯矿井自燃 “三带”特性。结果表明:亭南煤矿4号煤层下限氧气体积分数为8.0%,气体产物随氧含量降低总体呈现“滞后效应”;采空区氧化带在倾向上是不对称的,进风侧较宽,最大宽度为95 m;回风侧较窄,为77 m,与1#~4#煤矿采空区 “三带”相比,302工作面采空区散热带宽度较大回风侧相对较小,进回风侧氧化升温带最大宽度相对较小;在正常回采期间,煤自燃的主要威胁来自于采空区“两道”处浮煤。
关键词:激光光谱吸收;自燃;高瓦斯;程序升温;临界氧气体积分数
Abstract: In order to study the law of coal spontaneous combustion in high-gas coal mines, the No.4 coal seam at 302 face of Tingnan Coal Mine was used as the research object. We analyze the “three-zone” law of spontaneous combustion in the district, and through comparative analysis, the results of the “three-zone characteristic” of spontaneous combustion in high-gas mines show that the lower limit oxygen concentration of No.4 coal seam in Tingnan Coal Mine is 8.0%, and gas products show a “hysteresis effect” with the decrease of oxygen content; the oxidation zone of goaf is asymmetrical in tendency. The inlet side is wide and the maximum width is 95 m. The return air side is narrow(77 m). Compared with the “three zones” of 1# to 4# goaf, the width of the loose tropical zone of 302 working face goaf is larger and the return air side is smaller, and the maximum width of the oxidation warming zone of the inlet and outlet air side is smaller. During the normal stoping period, the main threat of coal spontaneous combustion comes from the “two roads” floating coal in the goaf. -
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