高浓度沼气流在矿井风流中的稀释过程的研究

THE STUDY OF HIGH CONCENTRATION METHANE DILUTION PROCESS IN MINE AIR FLOW

研究了煤矿高浓度沼气排放中沼气与风流的混合、稀释过程；分析了平衡浓度的计算；通过实验室模拟实验，确定了湍流情况下混合长度的经验公式；导出了描述沼气浓度场的对流扩散方程，并应用一维解描述沼气浓度的沿程变化规律。从而达到安全、有效地排放高浓度沼气，防止了瓦斯爆炸事故的发生。

In the paper, the methane--air mixing and diluting pattern is discussed. The calculation ofequilibrium concentration is analyzed. By laboratory similarity simulation test, empirical formula.of mixing length is obtained. The methane convection diffusion equation is derived to describe themethane concentration field. A I -dimesional solution of convection diffusion equation is used toshow the methane concentration distribution with distance in the mixing range. The study is useful and helpful for the safe and effective discharge of high concentration methane in coal mines.