摘要
为研究酸化作用后煤体的孔隙结构特征,采用低场核磁共振技术和X射线衍射实验方法,测试了高阶煤自然煤样和酸化煤样的孔隙结构和矿物含量,并根据分形理论对比研究了2种煤样孔隙的分形维数,探讨了酸化作用原理。研究结果表明:自然煤样和酸化煤样中微孔和过渡孔都占较大的比例;煤样酸化后,其孔隙率增大,最小孔径和最大孔径都变大;酸化作用能促使孔隙体积增大,增加的孔隙类型不确定;2种煤样中大孔孔隙结构具有分形特征,酸化后煤样大孔孔隙的分形维数增大;酸化后煤样矿物含量减少,导致孔隙结构发生变化。
In order to study the pore structure characteristics of coal after acidification,the pore structure and mineral content of natural and acidified coal samples of high rank coal were measured based on low field nuclear magnetic resonance technology and X-ray diffraction experiment,and according to fractal theory,the fractal dimension of pores of two coal samples was compared and the acidification principle was discussed.The results show that the micropores and transition pores account for a large proportion in both natural and acidified coal samples;after acidification,the porosity of coal sample increases,and the minimum pore size and maximum pore size become larger;acidification can increase the pore volume and increase the uncertainty of pore type;the structure of macropores in two kinds of coal samples has fractal characteristics,and the fractal dimension of macropores increases after acidification;the mineral content of coal sample decreases after acidification,resulting in the change of pore structure.
作者
熊建龙
王凯
杜全先
孟祥昌
郭兵兵
XIONG Jianlong;WANG Kai;DU Quanxian;MENG Xiangchang;GUO Bingbing(Sichuan Institute of Coalfield Geological Engineering Exploration and Designing,Chengdu 610072,China;Sichuan Provincial Coal Mine Gas(Coalbed Gas)Engineering Research Center,Chengdu 610072,China;Yunnan Zhaolu Expressway Co.,Ltd.,Qujing 655099,China;Yunnan Yunling Expressway Engineering Consulting Co.,Ltd.,Kunming 650000,China;Henan University of Engineering,Zhengzhou 451191,China)
出处
《矿业安全与环保》
北大核心
2022年第1期47-52,共6页
Mining Safety & Environmental Protection
基金
云南省交通运输厅科技项目(云交科教[2019]5号)
四川省煤田地质局2020年度科研项目(202006)。
关键词
煤
低场核磁共振技术
酸化作用
孔隙结构
分形维数
coal
low field nuclear magnetic resonance technology
acidification
pore structure
fractal dimension
