摘要
针对瓦斯在煤粒中的菲克型扩散,对煤粒瓦斯放散过程中扩散系数发生变化的机理进行了分析,并通过求取时变扩散系数Dt的公式对南桐煤样在瓦斯解吸放散过程中的扩散系数变化规律进行了测定,通过对实验数据的分析,得出了时变扩散系数的数学模型,推导出了时变扩散方程的解析解。
For Fick diffusion of methane in coal grain,diffusion coefficient variation mechanism was analyzed during methane emission and diffusion coefficient variation rule was tested during methane desorption and emission in coal sample from Nantong by solving time-varying diffusion coefficient equation.Mathematic model of time-varying diffusion coefficient was obtained and analytic solution of time-varying diffusion equation was deduced with test result.
出处
《煤矿开采》
北大核心
2012年第2期8-11,共4页
Coal Mining Technology
基金
国家科技重大专项大型油气田及煤层气开发:煤层气与煤炭协调开发关键技术(2011ZX05040-003)
关键词
瓦斯
时变
扩散规律
扩散系数
methane
time varying
spread rule
diffusion coefficient
