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为研究不同外界条件下瓦斯(甲烷)在煤体内部的扩散规律,根据相似理论和扩散方程建立瓦斯扩散系数计算方法,研制煤粒瓦斯扩散测定系统,并通过试验测定了不同煤体结构、不同压力、不同粒度条件下煤粒瓦斯瞬时扩散系数,分析不同条件下瞬时扩散系数的变化特征。研究结果表明:瞬时扩散系数与时间成幂函数递减关系;瓦斯在构造煤中的初期瞬时扩散系数远大于原生结构煤;随着粒度的增大,原生结构煤和构造煤中的瓦斯瞬时扩散系数明显增大,原生结构煤中的瓦斯瞬时有效扩散系数逐渐增大,但构造煤中瓦斯瞬时有效扩散系数却明显减小。
In order to study the diffusion rules of methane (methane) inside coal body under different external conditions, a calculation method of gas diffusion coefficient was established based on similarity theory and diffusion equation. A coal gas diffusion measurement system was developed and different coal body structures were determined by experiments Pressure, instantaneous diffusion coefficient of coal gas under different particle size conditions, and analyze the changing characteristics of instantaneous diffusion coefficient under different conditions. The results show that the instantaneous diffusion coefficient decreases with time as a power function; the initial instantaneous diffusion coefficient of gas in the structured coal is much larger than that of the primary structure coal; with the increase of the particle size, the instantaneous diffusion coefficient Obviously increased, the instantaneous effective diffusion coefficient of gas in primary structure coal gradually increased, but the instantaneous effective diffusion coefficient of gas in the structure coal decreased obviously.