中文摘要：

受早期小窑私挖乱采的影响，整合矿井往往面临废旧巷道或采空区遗煤多、漏风严重且复杂，煤自燃危险性大的难题，为了判断巷道高冒封闭火区的燃烧状态及其火区发展趋势，采用煤自燃低温氧化试验研究山西朔州某矿4＋9号煤层火灾指标气体及其变化规律，现场收集火区内气体初步判断火区燃烧状态，最后利用红外热成像仪圈划火区表面温度区域，定位巷道顶煤火区表面高温点并分析火区巷道表面温度场变化趋势。研究结果表明：在煤低温氧化进程中CO，C2H6和C2H4等指标气体将在特定的温度等条件下自发产生，利用指标气体出现温度和随温度变化趋势，可以初步判断火区燃烧状态及发展方向；通过巷道表面温度场能够圈划浅部隐蔽火区大致范围，验证火区燃烧状态，判断火区发展趋势，预测煤自燃的危险性，能为火区危险性预报和治理提供可靠依据。研究成果对隐蔽火源燃烧状态和发展方向分析具有一定参考价值，能够为具有类似条件的矿区防灭火工作提供借鉴。

英文摘要：

Considering that the integrated coal mines are faced with the problems of large amount of residual coal, serious air leakage and high risk of coal self-ignition for the effect of indiscriminate exploitation, the index gases and their changes with the increase of temperature of No.4＋9 Coal seam in Suozhou, Shangxi Province, were studied by temperature programmed experiment in order to determine the combustion state and development trend of fire zone. Then the combustion state was preliminarily judged by testing gas collected in the fire zone. Finally the surface temperature was measured by infrared thermal imager, positioning the surface high temperature point of fire zone on the roof of the roadway and analyzing the changing trend of the temperature field. The results show that CO, C2H6, C2H4 and other index gases arise at the specific temperature in the low-temperature oxidation of coal. The initial fire burning state and development direction can be determined by using the trend and temperature of index gases. The range of shallow hidden fire can be drawn, and the fire burning state can be verified. The development trends of fire can be judged, and the risk of coal spontaneous combustion can be predicted by the surface temperature field of roadway. It can provide reliable basis for forecasting and controlling fire danger. It is helpful to analyze the hidden fire, and has reference for other mines with similar conditions,