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设计了煤粒瓦斯解吸实验,得到4种粒径煤样在4组不同初始压力条件下累积解吸量随时间变化的实测曲线.根据菲克扩散定律与达西渗流定律分别建立了瓦斯在球形煤粒中放散的数学模型,通过有限差分的方法并利用VB编程进行解算,得到煤粒在不同初始压力下的累积解吸量.通过与实验结果对比,表明达西模拟结果与实验结果匹配度较高,而菲克模拟结果与之偏离较大.验证了煤粒中的瓦斯放散更符合达西定律.
The desorption experiment of coal gas was designed and the measured curves of cumulative desorption amount over time for four kinds of coal samples with different initial pressures were obtained.According to the Fick diffusion law and the Darcy seepage law, The mathematical model of the particle emanation was solved by finite difference method and VB programming, and the cumulative desorption amount of coal particles under different initial pressures was obtained.Comparing with the experimental results, it was shown that the matching degree between the Darcy simulation result and the experimental result is more High, while Fick’s simulation results deviate greatly from it, and it is verified that the gas emission in the coal particles is more consistent with Darcy’s law.