Aggregating structure in coal water slurry studied by eDLVO theory and fractal dimension  

作　　者：Qiang LI Qian WANG Jian HOU Jiansheng ZHANG Yang ZHANG 

机构地区：[1]Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China [2]Energy and Electricity Research Center,Jinan University,Zhuhai 519070,China

出　　处：《Frontiers in Energy》2023年第2期306-316,共11页能源前沿（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant Nos.2017YFB0602602 and 2017YFB0602703);the Seed Fund of Shanxi Research Institute for Clean Energy,Tsinghua University,China.

摘　　要：Coal water slurry gasification is a main source of hydrogen in the developing hydrogen economy.Moreover,biomass and waste can be added,making gasification process greener.To expand the application of coal water slurry and gasification process,it is necessary to understand the micro-structure in this large particle suspension system.In this paper,the micro-structure in coal water slurry was studied by extended DLVO(eDLVO)theory and fractal dimension,which is used to explain the mechanism of stability in large particle suspension systems.The interaction between two coal particles was characterized from the interparticle potential and energy barrier based on the eDLVO theory.The rheology and stability between different types of coals are measured and explained by the aggregating structure and fractal dimension in coal water slurry.The results indicated that there would be an aggregating structure in high rank coals,due to the interparticle potential caused by the surface properties,but probably not in low rank coals.This aggregating structure can be described and characterized by fractal dimension.The aggregation of particles is the source of the stability for high rank coals,as the close-packed 3D network structure in large particle suspension can support coal particles from settling down.The results have demonstrated that the combination of the eDLVO theory and rheological measurement is an effective way to investigate the stability of large particle suspension systems.

关 键 词：coal water slurry extended DLVO(eDLVO) fractal dimension STABILITY 

分 类 号：TE43[石油与天然气工程—油气田开发工程]