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Entropy and enthalpy changes during adsorption and displacement of shale gas

文献类型：期刊论文

作者Lin K(林岿)1,2; Zhao YP(赵亚溥)1,2
刊名ENERGY
出版日期2021-04-15
卷号221页码:7
关键词Shale gas Adsorption/displacement Entropy change Enthalpy change Statistical mechanics
ISSN号0360-5442
DOI10.1016/j.energy.2021.119854
通讯作者Zhao, Ya-Pu(yzhao@imech.ac.cn)
英文摘要Shale gas is a major component of the hydrocarbon economy, and there are abundant studies in related exploration and exploitation fields using simulations and experiments. In this paper, the kinetic processes of adsorption and displacement during shale gas exploitation are analyzed using enthalpy-driven and entropy-driven processes with molecular dynamics simulations and statistical mechanics analyses. First, the changes in symmetry of CH4 and CO2 adsorbed on the graphene surface are analyzed. The adsorption process is a spontaneous process, where the Gibbs free energy decreases. During this process, the gas molecular entropy and the enthalpy of the system decrease, which indicates an enthalpy-driven process. The changes in entropy and enthalpy of various gas molecules (CH4, CO2, N-2, and H2O) during the adsorption process are obtained. Through comparing the entropy and enthalpy changes before and after the displacement of CH4 by the different displacement media (CO2, N-2, and H2O). The CO2-injected displacement of CH4 is driven by both enthalpy and entropy, and the N-2-injected displacement of CH4 is driven by entropy. However, H2O-injected displacement of CH4 is not a spontaneous process. It plays a certain displacement role by reducing the partial pressure of CH4. To clarify the detailed spontaneous processes, the entropy change and exothermic processes during the supercritical fluid displacement of shale gas are discussed; then, the differences in displacement efficiency of different supercritical fluids are explained. This study is useful for understanding the kinetics mechanism of adsorption and displacement of shale gas. (c) 2021 Elsevier Ltd. All rights reserved.
分类号一类
资助项目National Natural Science Foundation of China (NSFC)[12032019] ; National Natural Science Foundation of China (NSFC)[11872363] ; National Natural Science Foundation of China (NSFC)[51861145314] ; Chinese Academy of Sciences (CAS) Key Research Program of Frontier Sciences[QYZDJSSWJSC019] ; CAS Strategic Priority Research Program[XDB22040401]
WOS研究方向Thermodynamics ; Energy & Fuels
语种英语
WOS记录号WOS:000632506300004
资助机构National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) Key Research Program of Frontier Sciences ; CAS Strategic Priority Research Program
源URL[http://dspace.imech.ac.cn/handle/311007/86338]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Lin K,Zhao YP. Entropy and enthalpy changes during adsorption and displacement of shale gas[J]. ENERGY,2021,221:7.
APA 林岿,&赵亚溥.(2021).Entropy and enthalpy changes during adsorption and displacement of shale gas.ENERGY,221,7.
MLA 林岿,et al."Entropy and enthalpy changes during adsorption and displacement of shale gas".ENERGY 221(2021):7.

入库方式： OAI收割

来源：力学研究所

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