煤自燃指标气体的吸附与浓缩规律

针对煤自燃指标气体在井下风流中浓度小而无法有效预报煤炭自燃程度的缺点，采用煤自燃指标气体的吸附浓缩实验系统，通过对煤样在不同温度条件下热解放出的烃类指标气体吸附浓缩前后检测结果分析，得出烃类指标气体的吸附浓缩规律，以及气体吸附浓缩后甲烷比、乙烷比、烯烷比与煤温的变化关系，使得相同温度下经吸附浓缩后可检测出的组分增多，且各组分气体检出的初始温度大幅降低，使检测出指标气体的初始温度平均提前了90 ℃左右，提高了各组分气体检测的灵敏度.

Law of index gases adsorption and condensability of coal spontaneous combustion

Aimed at disadvantage to that concentrations of coal spontaneous combustion index gases were low and couldn’t effectively forecast the extent of coal spontaneous combustion, by using of the experiment system of adsorption and condensability of coal spontaneous combustion index gases,analyzed the detection results of hydrocarbon index gases pyrolysed by coal before and after adsorption and condensability at different temperatures, which obtained the law of adsorption and condensability of hydrocarbon index gases, and variation relation of coal temperatures and methane ratio, ethane ratio, olefin alkyl ratio after adsorption and condensability. The component gases detected increase after adsorption and condensability at the same temperatures, the initial temperatures of component gases detected reduce sharply, and the initial temperatures of index gases detected precede by about 90 ℃,which improve the sensitivity of component gases detected.