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采用人为加湿煤样的方法,研究了Langmuir、BET、D-R及Freundlich等4个模型在不同水分条件下吸附甲烷的特性。结果表明:随着水分的增加,表征饱合吸附量的4个模型的特征参数值均减少;不同水分条件下,Langmuir模型拟合煤吸附甲烷等温线精度最高,D-R次之,BET模型最差;高压条件下,BET模型不适于描述不同水分含量煤样的等温吸附过程。
In this paper, the adsorption of methane on four models of Langmuir, BET, D-R and Freundlich under different water conditions was studied by using anthropogenic humidified coal samples. The results showed that with the increase of water content, the characteristic parameters of four models that characterize the saturated adsorption capacity all decreased. Under different water conditions, the Langmuir model fitted with the highest accuracy of coal adsorption methane isotherm, followed by DR, and the worst BET model Under high pressure, the BET model is not suitable for describing isothermal adsorption process of coal samples with different moisture content.