摘要
以山西古交、山西大同和和河南平顶山不同煤阶煤为研究对象,应用低温氮气吸附法和低温二氧化碳吸附法对酸化前后煤中孔隙结构进行表征,并应用孔隙分形理论,采用FHH模型对酸化前后煤孔隙数据进行拟合,求取酸化前后煤样分形维数。结果表明:(1)酸化会增加煤孔隙连通性,改变煤孔隙结构,其中对低煤阶煤孔隙影响大于对高煤阶煤影响;(2)酸化后煤微孔(<2 nm)孔容和比表面积增加;(3)酸化后煤分形维数降低,说明煤表面变的光滑,孔隙系统复杂程度降低。
Taking different coal rank coals as the research object,the pore structure of coal before and after acidification is characterized by low-temperature nitrogen adsorption method and low-temperature carbon dioxide adsorption method.The pore fractal theory and FHH model are used to fit the pore data of coal before and after acidification,and the fractal dimension of coal samples before and after acidification is obtained.The results show that:(1)Acidification will increase coal pore connectivity and change coal pore structure,in which the impact on low rank coal is greater than that on high rank coal.(2)After acidification,the micropore(<2 nm)volume and specific surface area of coal increase.The higher the coal rank,the higher coal increase rate of micropore volume and specific surface area.(3)After acidification,the fractal dimension of coal decreases,indicating that the coal surface becomes smooth and the complexity of pore system decreases.
作者
王向阳
李全中
吉小峰
连浩斌
史勇忠
王昱叡
WANG Xiangyang;LI Quanzhong;JI Xiaofeng;LIAN Haobin;SHI Yongzhong;WANG Yurui(Shanxi Jinneng Holding Group Yangquan Company,Yangquan 045000,China;Department of Mining Engineering,Shanxi Institute of Technology,Yangquan 045000,China;School of Resources and Earth Sciences,China University of Mining and Technology,Xuzhou 221000,China;School of Energy and Materials Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《煤炭技术》
CAS
2024年第4期292-297,共6页
Coal Technology
基金
山西省基础研究计划项目(202203021221143,202103021223390)。
关键词
酸化
矿物质
低温液氮
低温二氧化碳
孔隙结构
acidification
minerals
cryogenic liquid nitrogen
cryogenic carbon dioxide
pore structure
