Detailed study on self- and multicomponent diffusion of CO2-CH4 gas mixture in coal by molecular simulation
文献类型：期刊论文
| 作者 | Hu, Haixiang1; Du, Lei2,3; Xing, Yanfei1; Li, Xiaochun1
|
| 刊名 | FUEL
 |
| 出版日期 | 2017 |
| 卷号 | 187页码:220-228 |
| 关键词 | Multicomponent diffusion Mutual diffusion coefficients Self-diffusion Coal bed methane Molecular simulation |
| ISSN号 | 0016-2361 |
| DOI | 10.1016/j.fuel.2016.09.056 |
| 英文摘要 | Gas diffusion plays a key role in CO2-enhanced recovery of coal bed methane (ECBM), where more than one types of gases coexist and multicomponent gas diffusion occurs. Such process is now usually described by non-coupled two-component gas diffusion equations which exclude the interactions between gases. Self-diffusion and mutual diffusion of CO2-CH4 mixture are investigated through molecular simulation for the first time. The self-diffusion coefficients of CO2 and CH4 decrease with gas concentration but increase with temperature. The mutual diffusion coefficients of binary gas mixture of CO2-CH4 in coal are computed through Maxwell-Stefan diffusion theory. A 2D diffusivity matrix vertical bar D vertical bar (with diagonal element D-i and non-diagonal element Du) is obtained to depict the mutual diffusion of the gas mixture. It is found that CO2 (CH4) diffusion is coupled with CH4 (CO2). The diffusion coupling strength of CO2 and CH4 decreases with increasing gas concentration. Temperature positively affects Du but minimally influences Di, resulting in large ratios of D-ij/D-i at high temperatures. It means that CO2-CH4 diffusion correlation interactions, which are not present in non-coupled pure gas diffusion equations, are necessary to analyze gas mixture diffusion in coal. In this case, non-coupled pure gas diffusion equations are inadequate for description of CO2-CH4 mixture diffusion. The coupling between the gases can be ignored only at very high temperatures (T > 400 K), which means a large depth of coal bed in ECBM engineering. (C) 2016 Elsevier Ltd. All rights reserved. |
| WOS研究方向 | Energy & Fuels ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000386187100025 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/3968]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.China Petr Engn Co Ltd, Southwest Co 3.Oil & Gas Fire Protect Key Lab Sichuan Prov ; |
| 推荐引用方式 GB/T 7714 | Hu, Haixiang,Du, Lei,Xing, Yanfei,et al. Detailed study on self- and multicomponent diffusion of CO2-CH4 gas mixture in coal by molecular simulation[J]. FUEL,2017,187:220-228. |
| APA | Hu, Haixiang,Du, Lei,Xing, Yanfei,&Li, Xiaochun.(2017).Detailed study on self- and multicomponent diffusion of CO2-CH4 gas mixture in coal by molecular simulation.FUEL,187,220-228. |
| MLA | Hu, Haixiang,et al."Detailed study on self- and multicomponent diffusion of CO2-CH4 gas mixture in coal by molecular simulation".FUEL 187(2017):220-228. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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