煤中甲烷等温吸附模型的研究

利用SPSS软件对Langmuir,Freundlich,Langrnuir-Freundlich,Toth,扩展Langmuir,BET,D—R,D—A等8个模型以及3个曲线回归方程对晋城和潞安二煤CH4吸附实验数据进行拟合,并分别检验了实验数据的拟合程度．结果表明：这些模型和方程对煤吸附CH4实验数据都拟合较好,模型或方程的参数越多拟合程度越高;Langmuir模型对煤吸附CH4等温线拟合程度并不很高,D—A提供了最好的拟合;3参数BET模型中的超临界饱和蒸气压可用经验公式估算．

Study on fitting models for methane isotherms adsorption of coals

The eight different models viz. Langmuir, Freundlich, Langmuir-Freundlich, Toth, Expended-Langmuir, BET, D-R, D-A and three curvilinear regression equations were used to fit the experimental data of methane adsorbed on Jincheng and Lu'an coal by SPSS software, and the fitting degree of these models and equations to the experimental data was investigated. The results show that all these models and equations have good fit to the experimental data of methane adsorbed by coals, the more parameters used in the models and equations are, the better the fitting degree to experimental data is. The fitting degree of Langmuire model used commonly in methane adsorption isotherms of coals is not very good, but D-A model gives best fits to the experimental data. The saturation vapor pressure on supercritical condition in the BET having three parameters can be estimated with experiential equation, and BET model provided better fit to adsorption data.