CFD Simulation of fluid catalytic cracking in downer reactors--颗粒学报PARTICUOLOGY

Liu, F., Wei, F., Zheng, Y., & Jin, Y. (2006). CFD Simulation of fluid catalytic cracking in downer reactors. China Particuology, 4(3), 160–166. https://doi.org/10.1016/S1672-2515(07)60256-5

CFD Simulation of fluid catalytic cracking in downer reactors

Fei Liu ^a, Fei Wei ^a *, Yu Zheng ^a, Yong Jin ^a

a Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, P.R. China Received 4 Jan

10.1016/S1672-2515(07)60256-5

Volume 4, Issues 3–4, July 2006, Pages 160-166

Received 4 January 2006, Accepted 12 April 2006, Available online 27 November 2007.

E-mail: weifei@flotu.org

Highlights

Abstract

A mathematical model has been developed for the simulation of gas-particle flow and fluid catalytic cracking in downer reactors. The model takes into account both cracking reaction and flow behavior through a four-lump reaction kinetics coupled with two-phase turbulent flow. The prediction results show that the relatively large change of gas velocity affects directly the axial distribution of solids velocity and void fraction, which significantly interact with the chemical reaction. Furthermore, model simulations are carried out to determine the effects of such parameters on product yields, as bed diameter, reaction temperature and the ratio of catalyst to oil, which are helpful for optimizing the yields of desired products. The model equations are coded and solved on CFX4.4.

Graphical abstract

Keywords

downer; fluid catalytic cracking (FCC); lumping kinetic model; computational fluid dynamics (CFD)

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