Modeling the electrostatic effect on the hydrodynamic behavior in FCC risers: From understanding to application--颗粒学报PARTICUOLOGY

Chen, G., Su, Q., & Luo, Z. (2016). Modeling the electrostatic effect on the hydrodynamic behavior in FCC risers: From understanding to application. Particuology, 25, 122-132. https://doi.org/10.1016/j.partic.2015.05.008

Modeling the electrostatic effect on the hydrodynamic behavior in FCC risers: From understanding to application

Guoqiang Chen ^{a b}, Qinglin Su ^c, Zhenghong Luo ^{a d *}

a Department of Chemical Engineering, College of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
b Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
c Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom
d State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030000, China

10.1016/j.partic.2015.05.008

Volume 25, April 2016, Pages 122-132

Received 17 October 2014, Revised 5 April 2015, Accepted 14 May 2015, Available online 11 September 2015, Version of Record 18 February 2016.

E-mail: luozh@sjtu.edu.cn

Highlights

• Electrostatic effect in FCC risers was studied by CFD simulation coupled with electrostatic model.

• The coupled model was verified using open experimental data.

• Simulation results demonstrated obvious electrostatic effects in FCC risers.

• Electrostatic effect in small-scale FCC risers was stronger than their large-scale counterparts.

• External electric field may be applied to tailor the flow field in FCC risers.

Abstract

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.

Graphical abstract

Keywords

Multiphase flow; Mathematical modeling; Hydrodynamics; FCC riser; Electrostatic effect

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