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modeling the electrostatic effect on the hydrodynamic behavior in fcc risers： From understanding to application

Particuology 2016年第2期14卷 122-132页

作者： Guoqiang Chen Qinglin Su Zhenghong LUO Department of Chemical Engineering. College of Chemistry and Chemical Engineering Shanghaifiao Tong University Shanghai 200240 China Department ol:Chemical and Biochemical Engineering College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Department of Chemical Engineering Loughborough University Loughborough LE11 3TU United Kingdom State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030000 China

A CFD simulation was proposed to investigate the electrostatic effect on the hydrodynamic behavior of turbulent gas-solid flow in fcc risers. The simulation was first verified using the open experimental data with expected electrostatic effects observed in fcc risers. The influences of several operating parameters on the degree of electrification in fcc risers were analyzed, such as surface charge densities, pressure, gas velocity. It was noted that the gas velocity played a highly significant role compared with solid flux, while the effect of pressure was relatively weak. Further analysis showed that a much stronger electrostatic effect was found in small-scale fcc risers than their large-scale counterparts, and in addition, the major regions affected by the electrostatic charge depend on the scale of the riser. Finally, an external electric field was applied to optimize the flow field distribution in the fcc riser. The results of the electrostatic effects on the hydrodynamic behaviors in fcc risers are of great use in providing a reference for the optimization of fcc risers and their scaling.

关键词： multiphase flow mathematical modeling hydrodynamics fcc riser electrostatic effect

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