不同煤级煤层气吸附扩散系数分析  

Adsorption-diffusion Coefficient Analysis of Coal-bed Methane in Different Rank Coals

作　　者：张时音[1] 桑树勋[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008

出　　处：《中国煤炭地质》2009年第3期24-27,共4页Coal Geology of China

基　　金：国家重点基础研究发展规划项目课题(2002CB211703);国家高技术研究发展计划项目课题(2007AA06Z220);教育部科学技术研究重大项目(307014)资助

摘　　要：应用扩散理论模型模拟吸附扩散过程,根据四种煤级煤样的平衡水和注水等温吸附实验数据计算吸附扩散系数,研究吸附扩散的规律。研究表明:煤的孔隙结构是影响煤吸附扩散过程的主要因素。液态水对煤的润湿性随煤级增高而降低,对吸附扩散过程的影响逐渐减小,大孔和中孔发育的煤扩散速率较快,扩散系数高,过渡孔和微孔发育的煤相对扩散速率较慢,扩散系数低。Theoretical model of diffusion was used to simulating adsorption-diffusion process, and adsorption-diffusion coefficients of different coal rank samples were calculated based on isotherm adsorption experiment data of equilibrium moisture and water injection samples. The results show that pore structure is the dominant factor in effecting on coal adsorption diffusion process. Wettability and adsorption diffusion coefficient of coal sample decrease with the coal rank increased for the influence of liquid water. Adsorption diffusion rate and adsorption diffusion coefficient of coal with macropore and mesopore development is faster than that of coal with micropore development.

关 键 词：吸附 扩散 注水煤样 

分 类 号：P618.11[天文地球—矿床学]