煤矿安全2024，Vol.55Issue(3)：9-17,9.DOI:10.13347/j.cnki.mkaq.20222023
不同变质程度煤体微孔多重分形特征研究
Study on multi-fractal characteristics of micropores in coal with different metamorphic degrees
摘要
Abstract
In order to study the multi-fractal characteristics of micropore pore size of coal with different metamorphic degrees,ac-cording to the low temperature liquid nitrogen adsorption test data,the multifractal characteristics of micropores of 4 different meta-morphic coal samples and the correlation between pore characteristics and metamorphic degrees were studied by multifractal theory.The results show that the micropores of 4 coal samples have the typical characteristics of multifractality.The higher the metamorph-ic degree is,the stronger the heterogeneity of the micropore distribution of the coal sample is.The micropores have a larger specific surface area,which will provide more adsorption sites for gas and have a larger desorption amount.The micropore pore size of 4 coal samples mostly distributed in the narrow area of the pore space is about 7-9 nm;the micropore structure has obvious heterogeneity under weak deformation.In this region,the larger pore size distribution is uniform.However,on the whole,the relationship between connectivity and metamorphic degree is not obvious,and the pores are dominated by aggregation and uneven distribution.关键词
煤变质程度/煤孔隙结构/低温液氮吸附/孔径分布/分形维数Key words
degree of coal metamorphism/coal pore structure/low temperature liquid nitrogen adsorption/pore size distribution/fractal dimension分类
矿业与冶金引用本文复制引用
金霏阳,陈学习,高泽帅..不同变质程度煤体微孔多重分形特征研究[J].煤矿安全,2024,55(3):9-17,9.基金项目
国家自然科学基金资助项目(52174181) （52174181）
