基于分子间作用力的不同吸附模型适用性研究

Analysis on Applicability of Different Adsorption Model Based on the Molecular Inter-Atomic Forces

针对不同吸附模型对无烟煤阶段煤样吸附的适用性问题,在SPSS18.0平台上对程庄矿无烟煤吸附试验数据进行拟合,基于分子间作用力,从微观上对比研究Langmuir-Freundlich等6个模型的适用性。研究结果表明:(1)基于分子间作用力对煤样吸附适用性的研究是可靠有效的;(2)三参数模型的拟合效果优于二参数模型;(3)无烟煤阶段采用Freundlich吸附模型拟合是不适宜的,采用D-A模型效果最好;(4)依据超临界状态饱和蒸汽压所估算的饱和吸附量偏大,表明推算饱和蒸汽压的经验公式存在缺陷;(5)针对不同吸附模型对其它煤阶煤样吸附的适用性问题应该进一步研究。研究结果可为煤层气储量分析及涌出预测提供理论依据或参考。

Aiming at the problem of applicability of adsorption model to different stages anthracite coal sample, Cheng Zhuang coal adsorption test data were fitted on SPSS18.0 platform. Based on the molecular inter-atomic forces, commparative study from the microscopic Langmuir Freundlieh-6 model adaptability etc. The results showed that ： （ 1 ） the study based on molecular inter-atomic forces adsorption on applicability for coal sample is reliable and effective ; （ 2 ） three-parameter model fitting effect was superior to the two-parameter model ; （ 3 ） using Freundlieh adsorption model to fit the stage of anthracite was not appropriate, and using the D-A model gave the best result ; （ 4 ） according to the estimation of the supereritical state saturation vapor pressure to calculate the saturated adsorption a- mount would give larger data, showing that the calculation formula of the saturation vapor pressure had defects; （5） The problems of the applicability of different adsorption model to other coal rank coal sample adsorption needed further study. The results can provide theoretical reference for analysis and prediction of CBM Wells reserves.