【摘要】 根据松散介质中气体扩散的理论分析 ,得出了松散煤体中氧气等效扩散系数的理论计算公式 .在静态扩散双容积法的基础上 ,建立了松散煤体中气体扩散系数的实验测定装置 ,通过测定氧气在不同空隙率松散煤体中的等效扩散系数 ,确定了它的理论计算公式中修正系数的取值范围 ,从而得出其与空隙率的函数关系 .最后根据热力学原理 ,推算出松散煤自燃过程中不同温度和压力时氧气等效扩散系数的近似计算公式 .更多还原

【Abstract】 Through the theoretical analysis of the diffusion coefficient of oxygen in crashed coal,its calculation formula was obtained. Based on the double\|container method, an experimental set testing the diffusion coefficient was set up and the correct coefficient in the formula was determined by testing the diffusion coefficient of oxygen in crashed coal with different porosities. And the relationship between the diffusion coefficient and the porosity was gained. Finally, the formula of calculating the diffusion coefficient under the conditions of different temperature and pressure in the process of coal spontaneous combustion was given.更多还原