软硬煤瓦斯扩散系数动态变化规律的差异性

发布时间：2018-08-03 18:01

【摘要】：为了研究软硬煤瓦斯扩散特征的差异性,选择淮南丁集、安阳龙山2种变质程度的软硬煤样,模拟了瓦斯吸附-解吸动态扩散过程,对比了软硬煤瓦斯扩散系数的动态变化特征。采用压汞法测定了软硬煤的孔隙结构参数,分析了软硬煤解吸扩散参数差异的产生机理。结果表明:软硬煤在解吸的初始阶段,软煤的扩散系数明显大于硬煤,但随时间衰减也更快;在整个扩散时间内,煤粒瓦斯扩散系数随放散时间呈现单调递减的减函数,即呈幂函数衰减,最终趋于稳定,扩散系数体现出时变性的特征;软煤的中孔和大孔孔容明显大于硬煤,以致软煤的扩散系数明显大于硬煤;储存于不同孔隙和位置的瓦斯扩散路径的差异是软硬煤瓦斯扩散系数随时间变化的原因。
[Abstract]:In order to study the difference of gas diffusion characteristics of soft and hard coal, two kinds of soft and hard coal samples with metamorphic degree, Huainan Dingji and Anyang Longshan, were selected to simulate the dynamic diffusion process of gas adsorption-desorption. The dynamic variation characteristics of gas diffusion coefficient of soft and hard coal are compared. The pore structure parameters of soft and hard coal were measured by mercury injection method, and the mechanism of the difference in desorption and diffusion parameters of soft and hard coal was analyzed. The results show that in the initial stage of desorption, the diffusion coefficient of soft coal is obviously larger than that of hard coal, but decays faster with time, and the diffusion coefficient of coal particle gas decreases monotonously with the releasing time during the whole diffusion time. The diffusion coefficient of soft coal is obviously larger than that of hard coal, and the medium and large pore volume of soft coal is obviously larger than that of hard coal, and the diffusion coefficient of soft coal is obviously larger than that of hard coal. The variation of gas diffusion coefficient of soft and hard coal with time is due to the difference of gas diffusion paths stored in different pores and positions.
【作者单位】：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;河南理工大学安全学院;煤炭安全生产河南省协同创新中心;
【基金】：国家自然科学基金面上资助项目(51374095) 省部共建国家重点实验室开放课题重点资助项目(WS2012B02) 河南理工大学博士基金资助项目(B2013-005)
【分类号】：TD712

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