龙滩煤矿K1煤层自燃标志气体及其临界值研究

Study on signature gas and critical value of spontaneous combustion in K1 coal seam of Longtan Coal Mine

煤层自燃引发的煤矿火灾严重影响煤矿安全生产。为提前做好煤层自燃预测预防工作,以龙滩煤矿3122S回采工作面为研究对象,结合实验室煤自燃实验和现场标志性气体测试,对3122S回采工作面煤层自燃标志性气体临界值进行确定。通过煤样程序升温氧化实验,得到煤自燃产生的各气体浓度随温度变化规律,确定选取CO、乙烯C_(2)H_(4)为主要标志性气体;根据模糊统计数学方法计算出3122S回采工作面煤层煤样自燃临界温度为87℃;拟合现场实测的CO质量浓度和温度,代入煤样自燃临界温度计算得到标志性气体CO质量浓度临界值为88.50 mg/L,C2H4质量浓度临界值根据实验所测为0.90 mg/L。根据现场监测的标志性气体的临界值和温度双重预防煤自燃引发的火灾。

Coal mine fire caused by spontaneous combustion in coal seam seriously affects the safety of coal mine production.In order to anticipate and prevent the coal seam spontaneous combustion in advance,taking the 3122S working face of Longtan Coal Mine as the research object,combines laboratory coal spontaneous combustion experiments and on-site signature gas testing,and determines the critical value of spontaneous combustion signature gas in coal seam of 3122S working face.Through the temperature programmed oxidation experiment of coal sample,the variation law of gas concentration of coal spontaneous combustion with temperature was obtained,and CO and ethylene C_(2)H_(4)were selected as the main signature gases.According to the fuzzy statistical mathematical method,the critical temperature of spontaneous combustion of coal samples in 3122S working face is calculated to be 87℃.By fitting the measured mass concentration and temperature of CO on site and substituting the critical temperature of spontaneous combustion of coal samples,the critical value of the mass concentration of the signature gas CO is calcalated as 88.50 mg/L,and the critical value of the mass concentration of C2H4 is 0.90 mg/L.According to the critical value of the signature gas and the temperature monitored on site,the fire caused by spontaneous combustion of coal can be prevented.