Determination of Hydrogen Gas Emitted from Coal by Gas Chromatography and its Significance

Methane in coal mine gas is the research focus about the prevention of gas hazard and the development and utilization of coal bed methane. There have been more researches on heavy hydrocarbon in coal mine gas and a consensus has been formed about heavy hydrocarbon. Compared with methane and heavy hydrocarbon in coal mine gas, the research on hydrogen in coal mine gas is few and just unfolding. In this paper, 1097 gas samples are prepared based on 1097 coal samples. And, the hydrogen in gas samples is tested by Gas Chromatography. The research reveals that: the hydrogen contents in all gas samples can be detected, and the maximum value of hydrogen is 4.8% while the mean value is 0.645%, so the presence of hydrogen in gas is universal. 2 contents of hydrogen exceed 4%, 47 contents are between 2%-4% and 206 contents are between 1%-2%, thus, the content of hydrogen in gas is roughly the same with the content of heavy hydrocarbon in gas. It is suggested that: more attentions should be given to the hydrogen in gas to be an important index of coal and gas outburst and to be an important index of gas explosion, safety of coal storage and transportation.