不同条件煤粒瓦斯瞬时扩散系数变化特征试验

发布时间：2018-02-01 09:04

本文关键词： 瓦斯扩散系数 Fick定律煤体结构平衡压力煤粒粒度　出处：《中国安全科学学报》2017年08期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to study the diffusion law of gas (methane) in coal body under different external conditions, according to the similarity theory and diffusion equation, the calculation method of gas diffusion coefficient is established, and the coal particle gas diffusion measurement system is developed. The instantaneous diffusion coefficient of coal particle gas was measured under different coal structure, different pressure and different particle size. The characteristics of instantaneous diffusion coefficient under different conditions are analyzed. The results show that the instantaneous diffusion coefficient decreases with time by power function. The initial instantaneous diffusion coefficient of gas in structural coal is much larger than that of primary structure coal. With the increase of particle size, the instantaneous diffusion coefficient of gas in primary structure coal and tectonic coal increases obviously, and the instantaneous effective diffusion coefficient of gas in primary structure coal increases gradually. However, the instantaneous effective diffusion coefficient of gas in tectonic coal is obviously reduced.
【作者单位】：河南理工大学安全科学与工程学院;
【基金】：教育部创新团队发展支持计划项目(IRT_16R22) 河南省高校科技创新团队支持计划项目(14IRTSTHN002)
【分类号】：TD712
【正文快照】： 2河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地,河南焦作454000 3中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454000)0引言瓦斯(甲烷)预测与煤粒瓦斯扩散理论息息相关,如瓦斯损失量、瓦斯解吸指标、碎煤瓦斯涌出量问题都可以用瓦斯扩散理论

【相似文献】