基于压汞法的赵庄矿不同煤体结构煤的孔隙特征研究

Study on pore characteristics with different coal body structure in Zhaozhuang Coal Mine based on mercury injection method

选取赵庄矿3号煤层4种不同煤体结构煤的煤样,采用压汞法研究分析其煤体孔隙特征。实验表明,随着煤体破坏程度的增大,大孔孔容占比呈下降趋势,中孔、小孔孔容占比呈上升趋势,煤岩渗透性随之减小。原生结构煤、碎裂煤存在相当数量的封闭孔或孔径在纳米级以下,孔隙连通性差;碎粒结构煤孔隙连通性稍好,退汞效率在4种煤体结构中最高。

Four kinds of coal samples with different coal body structure of No.3 coal seam in Zhaozhuang Coal Mine were selected to analyze the coal pore characteristics by way of mercury intrusion porosimetry.The experiment showed that with the increase of destruction degree of coal body,the capacity ratio of macropore was decreasing,the capacity ratio of mesopore and micropore were increasing,and the permeability of coal decreased.The primary structural coal and cataclysmic coal have a considerable number of closed pores or pore sizes below the nanometer level,and its pore connectivity was poor.The pore connectivity of crushed coal was slightly better,and the mercury removal efficiency was the highest among the four coal structures.