中—高煤级煤孔隙分形特征  

Fractal Characteristics of Coal From Middle to High Rank

作　　者：袁镭[1] 宋党育[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454000

出　　处：《中州煤炭》2014年第6期84-88,共5页Zhongzhou Coal

基　　金：国家自然科学基金(41172141);教育部新世纪优秀人才支持计划(NCET-10-0133)

摘　　要：以平煤股份十三矿受岩浆侵入影响形成的不同煤化作用程度的10个原煤样品的压汞实验和低温氮气吸附实验数据为依据,应用孔隙的分形研究方法,揭示了中 高煤级煤的孔隙分形特征及其与煤级之间的内在联系.研究表明,压汞法和低温氮气吸附法测定的煤中孔隙均具有分形特征,尤其在不同孔径区段分形特征更加明显.压汞法压汞实验测定孔隙的分形维数为2.36 ～3.01,低温氮气吸附测定孔隙的分形维数分布在2.66 ～ 2.91之间.中 高煤级阶段（Ro,max在1.41％ ～6.52％之间）,随煤级升高,压汞法孔容10 ～ 100 nm孔径段孔隙的分形维数呈降低趋势,大于1μm孔隙的分形维数呈现增高的趋势;低温氮气吸附比表面积小于4.5 nm孔径段分形维数呈现降低的趋势,大于4.5 nm孔隙的分形维数递增规律明显.The relationship between the fractal characteristics of pore and the coal rank was studied based on mercury injection test and nitrogen adsorption test of 10 different coal rank samples caused by magmatic intrusion. The coal samples were collected from Pingdings- ban No. 13 Coal Mine. Research results show that the pore distribution determined by mercury injection and nitrogen adsorption has fraetal characteristic, and the fractal characteristic is more obvious especially in different aperture. Fractal dimension of pore test by mer- cury injection is 2.36 - 3.01, and it is 2.66 -2.91 by low temperature nitrogen adsorption experiment. With the increase of coal rank in middle to high rank （R in the 1.41% -6. 52% ） ,the pore fraetal dimension by mercury injection decreases in 10 - 100 nm aperture,and shows an increasing trend more than 1 μm aperture,the fractal dimension by nitrogen adsorption decreases in less than 4.5 nm aperture,and increase remarkably in more than 4. 5 nm aperture.

关 键 词：中—高煤级煤 压汞实验 氮气吸附实验 孔隙 分形维数 

分 类 号：P618.11[天文地球—矿床学]