煤体瓦斯扩散系数测定方法的研究进展

Research Progress on the Measurement of Gas Diffusion Coefficient

在煤体放散瓦斯的过程中,由瓦斯气体浓度变化引发的时变扩散行为直接影响煤体瓦斯扩散规律的宏观特征,煤体瓦斯扩散系数测定方法一直是国内外研究者关注的重点。分析了瓦斯扩散系数呈现时变特性的物理化学本质,重点总结介绍了目前常用的煤体瓦斯扩散系数的实验测定方法,结合实际经验分析了当前煤体瓦斯扩散系数各测定方法研究中存在的问题,并对未来的研究方向和研究重点进行了展望。

In the process of releasing gas from coal,the time-varying diffusion behavior caused by the change of gas concentration directly affect macroscopic characteristics of gas diffusion law of coal.The measurement of gas diffusion coefficient has always been the focus of domestic and foreign researchers.The physical and chemical essence of gas diffusion coefficient was analyzed as it presents time-varying characteristics,the commonly used experimental testing method of gas diffusion coefficient at present was mainly introduced.Combined with practical experience,the existing problems in the current measurement method of gas diffusion coefficient of coal were analyzed,at the same time,the direction and emphases of future research were prospected.