基于重量法的煤吸附甲烷实验及热力学分析  

Experimental and thermodynamic analyses of methane adsorption by coal based on weight method

作　　者：张明杰 龚泽[2] 谭志宏 刘浩 杨明鑫[2] ZHANG Ming-jie;GONG Ze;TAN Zhi-hong;LIU Hao;YANG Ming-xin(Henan Province Key Laboratory of Gas Geology and Gas Governance-Provincial Joint State Key Laboratory Cultivation Base,Jiaozuo 454003,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Collaborative Innovation Center of Henan Province for Coal Seam(shale)Gas in Central Plains Economic Zone,Jiaozuo 454003,China)

机构地区：[1]河南省瓦斯地质与瓦斯治理重点实验室/省部共建国家重点实验室培育基地,河南焦作454003 [2]河南理工大学安全科学与工程学院,河南焦作454003 [3]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454003

出　　处：《天然气地球科学》2021年第4期589-597,共9页Natural Gas Geoscience

基　　金：国家科技重大专项(编号:2011ZX05040-005);河南理工大学博士基金(编号:B2017-04);教育部创新团队计划(编号:IRT_16R22)联合资助。

摘　　要：研究吸附热对认识煤吸附甲烷作用机理具有重要作用。利用重量法对2组煤样进行303 K、308 K、313 K等温吸附实验,计算得到煤吸附甲烷的等量吸附热,分析煤吸附甲烷的热力学性质。结果表明:计算得到的等量吸附热在实验温度压力及对应的吸附量范围内最大值分别为30.51 kJ/mol和23.14 kJ/mol,表明煤对甲烷吸附属于物理吸附;等量吸附热随吸附量的增加而单调缓慢增加是因为吸附甲烷分子之间存在的相互作用力起主导作用;利用303 K和313 K等量吸附热数据预测了318 K等温吸附特征,与实验室实测等温吸附数据对比发现二者趋势相同,2组煤样相对误差分别为2.26%~5.72%和0.29%~2.19%。研究为利用等量吸附热预测不同温压条件下等温吸附特征提供了新方法。The study of adsorption heat plays an important role in studying the mechanism of methane adsorption by coal.The gravimetric method was used to conduct 303 K,308 K,and 313 K isothermal adsorption experiments on two sets of coal samples,and the equivalent adsorption heat of methane adsorption by coal was calculated,and the thermodynamic properties of coal adsorption of methane were analyzed.The research results show that the calculated isometric heat of adsorption is 30.51 kJ/mol and 23.14 kJ/mol in the experimental temperature and pressure and corresponding adsorption capacity,respectively,indicating that the adsorption of methane by coal belongs to physical adsorption;the increase in adsorption capacity increases monotonously and slowly,which is the result of the dominant interaction force between the adsorbed methane molecules;the 318 K isothermal adsorption characteristics are predicted using the 303 K and 313 K isothermic adsorption heat data,which is compared with the laboratory measured isothermal adsorption data.The two groups have the same trend.The relative errors of the two groups of coal samples are between 2.26%-5.72%and 0.29%-2.19%,respectively.A new method is proposed for using isosteric heat of adsorption to predict isothermal adsorption characteristics under different temperature and pressure conditions.

关 键 词：等温线预测 等量吸附热 吸附等温线 LANGMUIR模型 

分 类 号：TE122.1[石油与天然气工程—油气勘探]