摘要
分析了CO气体在煤体中的扩散模式和微观机理,得出在煤体中存在菲克型扩散、诺森扩散、过渡型扩散、表面扩散和晶体扩散几种扩散模式。从微观上看,影响CO气体在煤层中扩散的主要因素是CO气体的平均自由程和煤不同尺寸微孔隙的分布情况。根据分子运动论,从微观上讨论了压强和温度增强CO气体在煤层微孔隙中扩散能力的机理。根据不同孔隙分布的煤层,结合河北省部分煤矿煤样的孔隙分布实测数据,探讨了各种扩散模式的适用条件。
Diffusion modes and micro-mechanism of CO gas in coal were analyzed. It pointed out that in coal seams there are the following diffusion modes：Fick diffusion, Knudsen diffusion, transitional diffusion, surface diffusion and crystal diffusion. Moreover, seen from microscopic, the main factors impacting the diffusion of CO on coal seams are the mean free path of CO and the distribution of micropore of coal with different size. According to the molecular-kinetic theory, mechanism on diffusion of CO gas in the coal seam has been discussed microscopically with pressure and temperature incerasing. According to coal seams with different porosity distribution, the suitable condition of various diffusion patterns has been discussed with measured porosity distribution datas of coal samples getted form partial coal mines in Hebei Province.
出处
《河北理工大学学报（自然科学版）》
CAS
2009年第4期1-5,10,共6页
Journal of Hebei Polytechnic University:Social Science Edition
关键词
煤层
CO
扩散
coal seam
CO
diffusion
