This article is a U.S. Government work, and, as such, is in the public domain in the United States of America.
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Particle Technology and Fluidization
Analysis of model parameters affecting the pressure profile in a circulating fluidized bed†
Article first published online: 31 MAR 2011
DOI: 10.1002/aic.12603
Copyright © 2011 American Institute of Chemical Engineers (AIChE)
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How to Cite
Benyahia, S. (2012), Analysis of model parameters affecting the pressure profile in a circulating fluidized bed. AIChE J., 58: 427–439. doi: 10.1002/aic.12603
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Publication History
- Issue published online: 6 JAN 2012
- Article first published online: 31 MAR 2011
- Accepted manuscript online: 1 MAR 2011 08:32AM EST
- Manuscript Revised: 6 JAN 2011
- Manuscript Received: 29 SEP 2010
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Keywords:
- circulation fluidized beds;
- computational fluid dynamics (CFD);
- fluidization;
- multiphase flow;
- particulate flows
Abstract
This study focuses on continuum model validation of the flow of air and small catalyst particles in a circulating fluidized bed. Comparison with available experimental data of pressure drop and solids circulation rate in the riser clearly demonstrates the need to modify the homogeneous drag model to accurately predict the formation of clusters of particles, which are typically observed in the fluidization of small particles. The need to correct the drag law is also demonstrated in simulations of polydisperse powder flows wherein three solids species are used to represent a typical catalyst size distribution. Finally, particle-wall friction is found to have the most significant effect on the vertical gas pressure gradient while particle–particle friction has only a minor effect. Published 2011 American Institute of Chemical Engineers AIChE J, 58: 427–439, 2012