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 。
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.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2000年第6期20-22,共3页
Coal Geology & Exploration
基金
国家自然科学基金项目(59874028)
关键词
煤孔隙
扩散模式
煤层甲烷
微观机理
分子运动论
coal bed methane
number of Knudsen
diffusion mechanics
mean molecule free walk
