Optimization of index gases and division method of spontaneous combustion "three zones" in 10 coal seam of Qingdong Coal Mine
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摘要: 针对青东煤矿1078工作面自然发火问题，通过实验室研究和现场测试相结合的方法优选确定了自然发火标志性气体的主副指标：CO和C2H4气体可作为10煤层煤氧化自燃的主要标志性气体，烯烷比和链烷比作为10煤层煤氧化自燃标志气体的辅助指标。采用采空区氧气浓度变化规律和温度变化趋势2个指标划分了采空区自燃“三带”：距工作面0～31 m处为散热带，31～78 m处为自燃带，78 m以外为窒息带。该研究成果为1078工作面自然发火治理提供了科学依据及理论指导。Abstract: In view of problem of natural fire on 1078 working face of Qingdong Coal Mine, through a combination of laboratory research and on—site testing, the main and auxiliary indicators of spontaneous combustion index gases were optimized: CO and C2H4 can be used as main indexes of oxidation and spontaneous combustion of coal in 10 coal seam, olefin ratio and alkane ratio are used as auxiliary indexes of oxidizing spontaneous combustion index gas of coal in 10 coal seam. The spontaneous combustion "three zones" in goaf were divided by two indicators of oxygen concentration variation law and temperature change trend in goaf: the heat dissipation zone is 0～31 m from the working face, the spontaneous combustion zone is 31～78 m from the working face, and the suffocation zone is 78 m far away from the working face. The research results provide scientific basis and theoretical guidance for natural fire control on 1078 working face.
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