河北开滦矿区晚古生代煤对CO2和CH4气体吸附模型探讨  

Models of Pure CO_2 and Pure CH_4 Adsorption on the Late Paleozoic Coals from the Kailuan Coalfield,Hebei,China

作　　者：代世峰[1,2] 张贝贝[2] 彭苏萍[1,2] 张小东[3] CHOU Chenlin 

机构地区：[1]煤炭资源与安全开采国家重点实验室(中国矿业大学),北京100083 [2]中国矿业大学(北京)资源与地球科学系,北京100083 [3]河南理工大学,河南焦作454003 [4]Illinois State Geological Survey,615 East Peabody Drive,Champaign,IL 61820,USA

出　　处：《地质学报》2009年第5期731-737,共7页Acta Geologica Sinica

基　　金：欧盟第六框架的计划课题;国家973课题(编号2006CB202201)资助的成果。

摘　　要：对河北开滦矿区不同变质程度的煤进行了纯CO2和纯CH4气体等温吸附实验,并用Langmuir模型、三参数BET模型和吸附势理论模型(D-R,D-A)对煤的吸附实验数据进行了拟合,检验了各模型的拟合程度。结果表明:中煤阶烟煤的马家沟矿9号煤(Ro,ran=1.21%)对CH4和CO2吸附能力比低煤阶烟煤的林南仓矿11号煤(Ro,ran=0.58%)的吸附能力大;在相同压力下,同一煤样对CO2的吸附能力明显大于对CH4的吸附能力。马家沟矿9号煤对CO2和CH4的等温吸附线具有典型的I型特征,各模型对其吸附行为拟合误差相差很小,可用Langmuir方程描述;林南仓矿煤等温吸附线较复杂,因用Langmuir描述误差较大,应优先选择误差较小的吸附势理论D-A模型来描述其吸附行为。9号煤对CH4和11号煤对CO2和CH4的吸附均以单分子层吸附为主。Isothermal adsorption experiments of pure CO2 and CH4 on different coals in rank （the No. 11 Coal from the Linnancang Mine and the No. 9 Coal from the Majiagou Mine） from the Kailuan Coalfield of Hebei Province, China, have been studied. Four different models （Langmuir, BET, D-R, and D-A） were used to fit the experimental data of CO2 and CH4 adsorption and their fitting degree were investigated. The results showed that the adsorption capacity of the Majiagou coal（R = 1.21%）is higher than that of the Linnancang coal （R =0.58%）. The adsorption capacity of CO2 is higher than that of CH4 on the same coal under the same pressure. The adsorption isotherms of pure COz and pure CH4 on the Majiagou coal can be classified as Type I and their fitting errors of curves are very weak; thus the experimental data can be presented using the Langmuir isotherm. However, the adsorption of Linnancang coal is more complicated, and can be presented using D-A model because of its minimum error. Monolayer adsorption occurs during the adsorption of pure CO2 and pure CH4 on the No. 11 Coal and that of pure CH4on the No. 9 Coal.

关 键 词：开滦矿区 等温吸附 吸附模型 二氧化碳 甲烷 

分 类 号：P618.11[天文地球—矿床学]