摘要
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 gas desorption experiment in four particle sizes under four different initial pres- sures was designed. The measured curves of the accumulated desorption amount with the change of time were obtained. According to the law of Fick diffusion and Darcy flow, the mathematical models of the gas emission in a spherical coal particle were established respective- ly. The accumulated desorption amounts of the coal particles under different initial pressures are obtained using the finite difference method and VB programming. The results shows that the Darcy simulation results match the experimental results better, while Fick simulation re- sults have a large deviation. The gas emission in the coal particle follows Darcy law better.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2013年第6期923-928,共6页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划(973)项目(2011CB201202)
关键词
瓦斯放散
菲克扩散
达西渗流
数学模型
有限差分
gas emission
Fick diffusion
Darcy flow
mathematical model
finite difference
