Drag models for simulating gas–solid flow in the turbulent fluidization of FCC particles--颗粒学报PARTICUOLOGY

Li, P., Lan, X., Xu, C., Wang, G., Lu, C., & Gao, J. (2009). Drag models for simulating gas–solid flow in the turbulent fluidization of FCC particles. Particuology, 7(4), 269–277. https://doi.org/10.1016/j.partic.2009.03.010

Drag models for simulating gas–solid flow in the turbulent fluidization of FCC particles

Peng Li, Xingying Lan, Chunming Xu, Gang Wang, Chunxi Lu, Jinsen Gao^*

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

10.1016/j.partic.2009.03.010

Volume 7, Issue 4, August 2009, Pages 269-277

Received 27 November 2008, Accepted 22 March 2009, Available online 9 July 2009.

E-mail: jsgao@cup.edu.cn

Highlights

Abstract

This paper examines the suitability of various drag models for predicting the hydrodynamics of the turbulent fluidization of FCC particles on the Fluent V6.2 platform. The drag models included those of Syamlal–O’Brien, Gidaspow, modified Syamlal–O’Brien, and McKeen. Comparison between experimental data and simulated results showed that the Syamlal–O’Brien, Gidaspow, and modified Syamlal–O’Brien drag models highly overestimated gas–solid momentum exchange and could not predict the formation of dense phase in the fluidized bed, while the McKeen drag model could not capture the dilute characteristics due to underestimation of drag force. The standard Gidaspow drag model was then modified by adopting the effective particle cluster diameter to account for particle clusters, which was, however, proved inapplicable for FCC particle turbulent fluidization. A four-zone drag model (dense phase, sub-dense phase, sub-dilute phase and dilute phase) was finally proposed to calculate the gas–solid exchange coefficient in the turbulent fluidization of FCC particles, and was validated by satisfactory agreement between prediction and experiment.

Graphical abstract

Keywords

Turbulent fluidized bed; FCC particle; Drag model; CFD

文章导读