Dynamics of gas-particle flow in circulating fluidized beds

A. Srivastava, K. Agrawal, Sankaran Sundaresan, Reddy S.B. Karri, T. M. Knowlton

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

The flow of gas-particle mixtures in a circulating fluidized bed has been studied, probing the flow behavior under both stable and unstable operating conditions. A novel feature of our work is the use of electrical capacitance tomography to image particle distribution over the cross-section at one elevation in the standpipe. In addition, we have also obtained data on pressure profile and aeration rate in the standpipe, particle circulation rate in the circulating fluidized bed and riser gas flow rate under various operating conditions. Here, we report experimental results obtained for two different particles, both belonging to Geldart type A. At low aeration rates, a stable dense phase flow is obtained in the standpipe. At high aeration rates, the flow became unstable, manifesting low frequency oscillations in the flow characteristics. Our results suggest that, under conditions explored in the present study, this instability originates in the standpipe and that any attempt to model it should consider the interaction between the various components of the circulating fluidized bed system.

Original languageEnglish (US)
Pages (from-to)173-182
Number of pages10
JournalPowder Technology
Volume100
Issue number2-3
DOIs
StatePublished - Dec 1 1998

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Keywords

  • Capacitance tomography
  • Circulating fluidized bed
  • FCC particles
  • Instability
  • Standpipe flow

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    Srivastava, A., Agrawal, K., Sundaresan, S., Karri, R. S. B., & Knowlton, T. M. (1998). Dynamics of gas-particle flow in circulating fluidized beds. Powder Technology, 100(2-3), 173-182. https://doi.org/10.1016/S0032-5910(98)00138-7