| 煤层甲烷在煤孔隙中扩散的微观机理 |
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| 引用本文： | 聂百胜,张力,马文芳.煤层甲烷在煤孔隙中扩散的微观机理[J].煤田地质与勘探,2000,28(6):20-22. |
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| 作者姓名： | 聂百胜 张力 马文芳 |
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| 作者单位： | 1. 中国矿业大学 徐州 221008; |
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| 摘 要： | 分析了煤层甲烷在煤体中的扩散模式和微观机理,得出在煤体中存在有以下几种扩散模式:菲克型扩散、诺森扩散、过渡型扩散、表面扩散和晶体扩散,并分析了抽放时甲烷在煤层中的运移过程及其在煤微孔隙中的扩散过程。根据分子运动论从微观上讨论了压强和温度对甲烷分子平均自由程的影响规律,并解释了升高压强和温度增强甲烷气体在煤层微孔隙中扩散能力的机理。
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| 关 键 词： | 煤层气 诺森数 扩散 分子平均自由程 |
| 收稿时间： | 2000-04-26 |
| 修稿时间： | 2000-04-26 |
DIFFUSION MICRO-MECHANISM OF COAL BED METHANE IN COAL PROES |
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| Nie Baisheng,Zhang Li,Ma Wenfang.DIFFUSION MICRO-MECHANISM OF COAL BED METHANE IN COAL PROES[J].Coal Geology & Exploration,2000,28(6):20-22. |
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| Authors: | Nie Baisheng Zhang Li Ma Wenfang |
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| Institution: | 1. China University of Mining and Technology;2. Xijie Middle School, Pinglu, Shanxi |
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| Abstract: | Diffusion modes and micro mechanism of coal bed methane(CBM) in coal is analyzed.In coal seams there are the following gas diffusion modes:Fick diffusion,Knudsen diffusion,transitionary diffusion,surface diffusion and crystal diffusion.Moreover,the migration and diffusion processes of CBM in coal seams as CBM is drained are described.The effect rules of pressure and temperature on the mean molecule free walk of methane are discussed in microscope according to molecule dynamics.Besides,the micro-mechanism of enhancing the diffusion ability of methane by increasing pressure and temperature is explained. |
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