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Elutriation and Species Segregation Characteristics of Polydisperse Mixtures of Group B Particles in a dilute CFB Riser

  1. Jia Wei Chew,
  2. Drew M. Parker,
  3. Christine M. Hrenya*

Article first published online: 19 MAR 2012

DOI: 10.1002/aic.13784

Issue

AIChE Journal

AIChE Journal

Volume 59, Issue 1, pages 84–95, January 2013

Additional Information

How to Cite

Chew, J. W., Parker, D. M. and Hrenya, C. M. (2013), Elutriation and Species Segregation Characteristics of Polydisperse Mixtures of Group B Particles in a dilute CFB Riser. AIChE J., 59: 84–95. doi: 10.1002/aic.13784

Author Information

  1. Dept. of Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO

*Correspondence concerning this article should be addressed to C. M. Hrenya at hrenya@colorado.edu.

Publication History

  1. Issue published online: 21 DEC 2012
  2. Article first published online: 19 MAR 2012
  3. Accepted manuscript online: 22 FEB 2012 01:36PM EST
  4. Manuscript Revised: 20 FEB 2012
  5. Manuscript Received: 1 MAY 2011

Funded by

  • Particulate Solid Research Incorporated (PSRI)
  • Department of Energy. Grant Number: DE-FC26-07NT43098
  • National Science Foundation. Grant Number: CBET-0650893

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Keywords:

  • binary mixture;
  • continuous particle size distribution;
  • Geldart Group B;
  • circulating fluidized bed riser;
  • elutriation;
  • entrainment;
  • species segregation

Experiments in a dilute, gas-solids circulating fluidized bed have been conducted, with an emphasis on the impact of polydispersity on elutriation and species segregation. Two categories of polydispersity were studied: binary mixtures with various compositions and continuous particle size distributions (PSDs) with various widths. Qualitative differences between the two include (i) total elutriation flux of binary mixtures increases with the composition of fines (Ut < Us) but not so for continuous PSDs and (ii) elutriation flux of coarse particles (Ut > Us) depends non-monotonically on fines composition for binary mixtures but monotonically for continuous PSDs. These differences are explained by the increasing size disparity of continuous PSDs as distribution width increases, while the size disparity remains constant in binary mixtures of varying compositions. A third qualitative difference is the monotonic decrease in mass % of coarse particles with riser height observed for continuous PSDs, and a nonmonotonic behavior for binary mixtures. © 2012 American Institute of Chemical Engineers AIChE J, 59: 84–95, 2013

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