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采用Φ50mm×100mm的标准柱状原煤样开展了不同温压下的瓦斯扩散实验,同时开展了同种煤的颗粒煤瓦斯扩散对照实验.为描述大尺度柱状煤样的瓦斯扩散过程,建立了柱状煤芯瓦斯扩散方程,导出了其扩散率解析解.实验表明:相比颗粒煤样,柱状原煤瓦斯扩散缓慢,表现为同时间下瓦斯累计扩散量和扩散率远小于颗粒煤.柱状煤芯的扩散系数远大于颗粒煤的扩散系数,是后者的11.72倍,而柱状煤的有效扩散系数远小于颗粒煤的有效扩散系数,仅为后者的1.82%.原因是柱状原煤包含了更大的孔裂隙结构,使其扩散系数较大,但因扩散路径的加长和迂曲度的增大,使其有效扩散系数较小,最终导致其具有较小的瓦斯释放能力.
The gas diffusion experiment under different temperature and pressure was carried out by using standard columnar raw coal samples of Φ50mm × 100mm, and the control experiment of gas diffusion between the particles of the same kind of coal was carried out.In order to describe the gas diffusion process of large scale columnar coal samples, columnar coal The results show that compared with granular coal samples, the gas diffusion in columnar raw coal is slow, showing that the cumulative gas diffusion and diffusion rate are much less than that of granular coal at the same time. Diffusion of columnar coal core The coefficient is much larger than the diffusion coefficient of coal, which is 11.72 times that of the latter, while the effective diffusion coefficient of cylindrical coal is far less than the effective diffusion coefficient of particulate coal, only 1.82% of the latter.The reason is that the columnar coal contains larger pores The fissure structure makes its diffusion coefficient larger, but due to the longer diffusion path and tortuosity, its effective diffusion coefficient is smaller, which eventually leads to its smaller gas release capacity.