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为研究煤屑瓦斯的放散规律,采用理论分析和数值模拟的方法,利用Fick定律建立煤屑瓦斯放散方程并进行无因次化,通过有限差分对方程进行离散,并编制VB程序解算,得到4种粒径的煤屑在不同初始瓦斯压力下累积解吸量随时间的变化.研究结果表明:扩散率函数和时间呈线性变化,扩散参数与扩散速度呈正相关即扩散系数是一个表征煤屑瓦斯扩散速度快慢的参数.
In order to study the law of gas release from coal dust, theoretical analysis and numerical simulation methods were used to establish the coal gas methane emission equation by Fick’s law. The coal gas methane diffusion equation was dimensionless. The equations were discretized by finite difference method. The results show that the diffusion rate function and the time change linearly, and the diffusion coefficient is positively correlated with the diffusion rate. That is to say, the diffusion coefficient is a characterization of the coal gas Diffusion speed parameters.