华北区域不同煤阶样品孔隙结构特性研究

为探求华北区域煤样的孔隙发育特征,采用压汞法对采自此区域不同煤阶样品孔隙结构和分形维数进行研究。研究结果表明,煤体孔容和比表面积分别由大孔和微孔发育情况所决定,且100nmD1000nm范围内中孔相对不发育;随着Ro,max变化,煤体孔容和比表面积均呈现两端高大中间低的曲线形态;煤样中大于50.4~95.4nm孔径具有分形特征,此孔径范围主要包括部分过渡孔、中孔和大孔,并且随着Ro,max的增加,分形维数整体呈现降低的趋势。

Investigation on Pore Structure Characteristics of Coal from North China

The pore structure characteristics and fractal dimension of coal acquired from North China are investigated by using mercury intrusion method. The results show that the pore volume and specific surface area of coal are determined by development of big porous and micro porous respectively, and as the change of Ro,max the pore volume and specific surface area of coal change curves appear higher both end and lower middle; when pore diameter exceed range from 50.4 to 95.4, the pore diameter appear fractal characteristics and as the increase of Ro,max the fractal dimension present decreasing trend as a whole.