软硬煤瓦斯扩散特性及差异性研究

为了弄清软硬煤瓦斯扩散特性的差异性,采用吸附解吸实验装置对软硬煤的瓦斯扩散特性进行测试,结果表明:软煤的瓦斯极限吸附量大于硬煤的瓦斯极限吸附量;软硬煤的瓦斯扩散量随着时间的增加而增加,软煤的瓦斯扩散量大于硬煤的瓦斯扩散量;软硬煤的瓦斯扩散率随着时间的增加而增加,但增加的梯度逐渐减小,软煤的瓦斯扩散率大于硬煤的瓦斯扩散率;软硬煤的瓦斯扩散系数随着时间的增加而减小,在扩散的前期软硬煤扩散系数减小幅度最大,随着时间的延长,扩散系数减小幅度逐渐减小;软煤扩散系数的衰减速度大于硬煤瓦斯扩散系数的衰减速度,软煤的瓦斯扩散系数大于硬煤的瓦斯扩散系数,研究结果为煤层瓦斯防治提供理论指导。

Study on Diffusion Characteristics and Difference of Soft and Hard Coal Gas

In order to understand the difference of gas diffusion characteristics between soft and hard coal,the adsorption and desorption experiment device was used to test the gas diffusion characteristics of soft and hard coal.The gas diffusion of soft and hard coal increases with time,and the gas diffusion of soft coal is greater than that of hard coal.The gas diffusivity of soft coal increases with time,but the gradient decreases gradually.The gas diffusivity of soft coal is greater than that of hard coal.The gas diffusion coefficient of soft and hard coal decreases with the increase of time.In the early stage of diffusion,the diffusion coefficient of soft and hard coal decreases the maximum.With the extension of time,the diffusion coefficient decreases gradually.The attenuation rate of diffusion coefficient of soft coal is greater than that of gas diffusion coefficient of hard coal,and the gas diffusion coefficient of soft coal is greater than that of hard coal.