煤层气吸附与解吸可逆性实验研究

Experimental study on the adsorption and desorption reversibility of coalbed methane

以等温吸附与解吸实验为手段,通过对不同变质程度的煤进行吸附/解吸等温线的测定,探讨煤层气吸附与解吸可逆性.实验结果分析发现:低阶煤煤样吸附/解吸曲线出现了明显的滞后环,吸附和解吸过程所回归a(Langmuir体积)值相差比较大,说明吸附与解吸吻合性差,对甲烷的吸附和解吸表现出非可逆性;中、高级煤吸附与解吸等温线具有很好的重合性,吸附与解吸过程所回归的a(Langmuir体积)值也比较接近,对甲烷的吸附和解吸表现出可逆性.该现象的发现,为煤层气开采参数的确定具有一定的意义.

This paper studies coal-methane adsorption-desorption reversibility mainly by taking the adsorption-desorption isotherm experiment as a method and through the determination of different metamorphic grade coal adsorption-desorption isotherms.The research indicates that low-rank coal adsorption-desorption isotherms has a clear hysteresis loop,and relatively large difference between the two isotherms a-value （Langmuir volume） of regression analysis,indicating the low-rank coal displays the non-invertibility to the adsorption-desorption process of methane on low-rank coal;the medium-high rank adsorption-desorption isotherms coal has a good frequency coincidence,and the two isotherms a-value（Langmuir volume） of regression analysis is relatively close,indicating the medium-high rank coal displays the invertibility to the adsorption-desorption process of methane on medium-high rank coal.The discovery of these phenomena,to determine the parameters of coal-methane extraction is of some significance.