| 甲烷及二氧化碳在不同煤阶煤内部的吸附扩散行为 |
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| 引用本文： | 张登峰,崔永君,李松庚,宋文立,林伟刚. 甲烷及二氧化碳在不同煤阶煤内部的吸附扩散行为[J]. 煤炭学报, 2011, 36(10): 1693-1698 |
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| 作者姓名： | 张登峰 崔永君 李松庚 宋文立 林伟刚 |
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| 作者单位： | 1．中国科学院 过程工程研究所 多相复杂系统国家重点实验室，北京 100190；;2．中国科学院 研究生院,北京 100049 |
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| 基金项目： | 国家自然科学基金资助项目(40672100); 中国科学院过程工程研究所“百人计划”资助项目(0924051164) |
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| 摘 要： | 采用容量法确定吸附量的方法，基于Fick第二定律，在吸附平衡压力约为1.4 MPa，温度为35～65 ℃的实验条件下，研究了甲烷（CH4）和二氧化碳（CO 2）在不同煤阶煤内部的吸附扩散行为。研究结果表明：Fick第二定律能够很好地描述CH 4及CO 2在不同煤阶煤内部的扩散行为；CH 4和CO 2有效扩散系数随着吸附温度的升高而增大，同时有效扩散系数和煤阶（利用镜质组最大反射率R o，max表征）之间呈现“U”形关系；相同条件下，同种煤样的CO 2有效扩散系数高于CH 4；CH 4和CO 2在不同煤阶煤内部的扩散主要受微孔内部的表面扩散控制。
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| 关 键 词： | 甲烷；二氧化碳；煤；吸附；扩散；Fick第二定律 |
| 收稿时间： | 2011-01-03 |
Adsorption and diffusion behaviors of methane and carbon dioxide on various rank coals |
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| ZHANG Deng-feng,,CUI Yong-jun,,LI Song-geng,SONG Wen-li,LIN Wei-gang. Adsorption and diffusion behaviors of methane and carbon dioxide on various rank coals[J]. Journal of China Coal Society, 2011, 36(10): 1693-1698 |
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| Authors: | ZHANG Deng-feng CUI Yong-jun LI Song-geng SONG Wen-li LIN Wei-gang |
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| Affiliation: | ZHANG Deng-feng1,2,CUI Yong-jun1,3,LI Song-geng1,SONG Wen-li1,LIN Wei-gang1(1.State Key Laboratory of Multi-phase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China,2.Graduate University,Beijing 100049,3.Beijing Research Institute,China Shenhua Coal to Liquid and Chemical Co.,Ltd.,Beijing 100011,China) |
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| Abstract: | The adsorption and diffusion behaviors of methane(CH4)and carbon dioxide(CO2)on various rank coals were investigated with a volumetric method at temperature range from 35 ℃ to 65 ℃ and a pressure of 1.4 MPa.The experimental results show that the second Fick’s Law can well describe the diffusion behaviors of CH4 and CO 2 on various rank coals under the experimental conditions.The effective diffusivities of CH 4 and CO 2 increase with an increase of temperature and present a U shaped trend with coal rank,which is indicated by maximum vitrinite reflectance coefficient,R o,max .The effective diffusivity of CO 2 is larger than that of CH4 under the same conditions.The diffusion of CH4 and CO2 on various rank coals is mainly dependent on surface diffusion in micropore. |
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| Keywords: | methane carbon dioxide coal adsorption diffusion the second Fick's Law |
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