煤对超临界甲烷的吸附与解吸特性研究

研究了晋城和潞安煤对超临界 CH4的吸附与解吸特性 ,利用 SPSS软件对 Lang-muir,BET,D- R和 D- A四个模型对煤 CH4吸附和解吸实验数据进行拟合 ,并分别检验了实验数据的拟合程度 .结果表明 :煤吸附和解吸过程并不可逆 ,煤解吸 CH4时的吸附量要比煤吸附 CH4时的吸附量高 ;这些模型对煤吸附和解吸过程中的吸附 CH4实验数据都具有较好的拟合 ,D- A提供了最好的拟合 ,Langmuir的拟合度最差 ;各模型对解吸数据的拟合度要比吸附数据的拟合度好 .

STUDY ON SUPERCRITICAL METHANE ADSORPTION AND DESORPTION CHARACTERISTICS ON COAL AND MODEL FITTING

The supercritical methane adsorption and desorption characteristics on Jincheng and Lu'an coal have been studied, and four different models viz. Langmuir, BET, D-R and D-A are used to fit the experimental data of methane adsorbed on the two coal sample during adsorption and desorption by SPSS software, and the fitting degree of these models to the experimental data is investigated in the paper. The studying results show: There is not a reversible process between the adsorption and desorption, and adsorbed methane volume during desorption is higher than that during adsorption; All these models give good fit to the experimental data of methane adsorbed by coals including adsorption and desorption,the D-A model gives the best fitting degree to experimental data, the Langmuir model gives the worst one; These models provide better fitting degree to data coming from desorption than that coming from adsorption.