不同变质程度煤体孔隙结构非均质性表征
Heterogeneity characterization of coal pore structure with different metamorphic degrees
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摘要: 采用多重分形理论，对不同变质程度煤样的低温液氮吸附实验数据进行研究，探讨煤样孔隙多重分形特征、分形参数与孔隙参数和变质程度之间的关系。结果表明：不同变质程度煤样孔径分布均存在明显的多重分形特征，随着变质程度的增加，煤样的微孔比表面积占比逐渐增大，且比表面积占比最高的孔径段随变质程度的升高而降低；煤样中孔径越小非均质性越明显，较大孔径分布较均一，煤样孔隙的联通性与变质程度无明显相关关系；奇异指数a0与谱宽△a均与变质程度呈正相关关系，而参数Rd与变质程度呈反相关关系，即变质程度越高煤样内部孔径分布越不均匀，且煤样内部小概率子集个数占有率越低。Abstract: The experimental data of low temperature liquid nitrogen adsorption for coal sample with different metamorphic degrees was researched with multi-fractal theory. Then the relationship between pore multi-fractal characteristics of coal samples, fractal parameters, pore parameters and metamorphic grade was discussed. The results show that, the pore size distribution of different rank coals has obvious multi-fractal characteristic. With the increase of metamorphic degree, the specific surface area ratio of micro-pores in coal samples increases gradually. The pore section that has the highest level of specific surface area will decrease with the increase of metamorphic grade. The smaller the pore size in coal sample, the more obvious the heterogeneity and the larger pores distributed evenly. There was no significant correlation between the connectivity and metamorphic grade of coal pores. Both the singular index a0 and spectrum width △a had a positive correlation with metamorphic grade, but the parameter Rd had negative correlation with metamorphic grade. In other words, the higher the metamorphic degree, the more uneven the pore size distribution in the coal sample, and the lower the share of the number of small probability subset in the coal sample.
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