以平朔矿区4个煤层煤样为研究对象,利用程序升温试验重点研究CO、C2H4、H2气体在煤氧化自燃过程中的变化规律,同时也对同一矿井的不同煤层、同一煤层不同矿井的气体变化规律进行了对比分析。试验结果表明:平朔煤产生CO的临界温度为60～70℃,C2H4出现的温度为120℃左右,H2生成的临界温度为90℃,且生成量随煤温的上升呈先增大后减小的变化趋势。因此,平朔矿区检测煤炭自燃的标志气体应以CO和C2H4为主、H2为辅。

Based on four seam coal samples from Pingshuo Mining Area as the study objects, the programmed temperature rising test was applied to the key study on the variation laws of the CO, C2H4 and H2 gases during the coal oxidized spontaneous combustion process.Meanwhile, a comparison analysis was conducted on the variation laws of the gases from different seams in a same mine and the gases from the same seam of different mines. The test results showed that the critical temperat ure of CO produced from Pingshuo coal was 60~70 °C, the temperature of C2H4 appeared was about 120 °C and the critical temperature of H2 occurred was 90 °C.The H2 production quantity would be increased firstly with the coal temperature increased and then would be reduced in a variation tendency. The index gas to check the coa 1 spontaneous combustion in Pingshuo Mining Area would be CO and C2H4 mainly and H2 secondary.