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为深入探讨煤对甲烷气体吸附—解吸机理及可逆性,作者从物理化学和界面化学以及现代煤层气吸附理论的角度,并通过系统的煤对甲烷气体吸附—解吸可逆性物化模拟实验,进一步科学地求证了煤对甲烷气体吸附—解吸可逆性问题。根据理论分析和实验成果,明确地提出了：①煤对气体分子的物理吸附特性决定了吸附与解吸的可逆性;②吸附在煤内表面的甲烷分子被解吸需要一定的能量,以摆脱煤表面与甲烷分子之间的范德华力,因此解吸过程会不同程度地滞后于吸附。

Theoretical Analysis of Coal-methane Adsorption/Desorption Mechanism and Its Reversibility Experimental Study

In the paper through the systematical physicochemical simulation experiments of coal methane adsorption/desorption reversibility, the problems with the coal methane adsorption/desorption mechanism and its reversibility are thoroughly discussed in combination with the theories of physical chemistry and interfacial chemistry and the contemporary coalbed methane adsorption theory; and, according to the theoretical analysis and experimental results, it is concluded that ① the adsorption/desorption reversibility is determined by the character of methane moleculae’s being physically adsorbed by coal, and ② the desorption of the methane moleculae adsorbed on coal surface needs a certain energy to overcome Van der Waals force between the coal surface and the methane moleculae, so that the course of desorption will lag behind that of adsorption in varying degrees. (Financed by the National Basic Research Program Project：Basic studies on the formation mechanism and economic exploitation of coalbed gas reservoirs in China,No. 2002CB2117)