不同粒径煤的瓦斯扩散特性实验

Experiment on Gas Diffusion Characteristics of Coal with Different Particle Sizes

采用自制的吸附/解吸实验装置进行不同粒径煤的瓦斯扩散实验,结果表明:甲烷的扩散量随着时间的增加而增大,小粒径煤的扩散量达到平衡的时间短,大粒径煤的扩散量达到平衡的时间长;甲烷扩散率随着时间的增加而增大,粒径越大,扩散率的增长速率越小,粒径越小,扩散率的增长速率越大;扩散系数D随着煤粒径的增加而增大。其为煤层瓦斯治理提供重要的理论依据。

The gas diffusion experiments of coal with different particle sizes were carried out with a self-made adsorption/desorption experimental device.The results showed that the methane diffusion increased with the increase of time,the diffusion of small-particle size coal reached equilibrium in a short time,and the diffusion of large-particle size coal reached equilibrium in a long time.The diffusion rate of methane increases with time.The larger the particle size is,the smaller the growth rate of the diffusion rate is.The smaller the particle size is,the greater the growth rate of the diffusion rate is.D diffusion coefficient increases with the increase of coal particle size.It provides important theoretical basis for coal seam gas control.