Journal
ADVANCED POWDER TECHNOLOGY
Volume 25, Issue 5, Pages 1474-1482Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apt.2014.04.001
Keywords
Polydisperse polymerization FBRs; 3-D CFD-PBM model; Drag model; Hydrodynamics
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Funding
- National Natural Science Foundation of China [201076171]
- State-Key Laboratory of Chemical Engineering of Tsinghua University [SKL-ChE-13A05]
- Key Laboratory of Advanced Control and Optimization for Chemical Processes of the National Ministry of Education of China [2012ACOCP03]
- State Key Laboratory of Coal Conversion of China [J13-14-102]
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This work investigated a coupled computational fluid dynamics and population balance modeling (CFD-PBM) approach to predict the hydrodynamic behavior of the complex gas-solid two-phase flow in a three-dimensional (3-D) polydisperse propylene polymerization fluidized bed reactors (FBRs). Four different drag models, namely Syamlal-O'Brien, Gidaspow, McKeen and EMMS, were incorporated into the CFD-PBM model for evaluating the different effect of drag force between the gas and solid phases. Simulation results revealed a significant effect of the drag model on gas-solid flow in polydisperse polymerization FBRs. It was found that (1) compared to Syamlal-O'Brien and Gidaspow drag models, McKeen and EMMS drag models could predict a lower bed height, a higher temperature and an obvious core-annulus structure in polymerization FBRs; (2) EMMS drag model outperforms the other three drag models with respect to pressure drop prediction; and (3) the drag coefficient had little influence on the evolution of Sauter number and particle-size distribution. (C) 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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