Investigation of particle velocity in FCC gas-fluidized beds based on different measurement techniques

Sina Tebianian, Kristian Dubrawski, Naoko Ellis, Ray A. Cocco, Roy Hays, S.b. Reddy Karri, Thomas W. Leadbeater, David Parker, Jamal Chaouki, Rouzbeh Jafari, Pablo Garcia-trinanes, Jonathan P.k. Seville, John R. Grace

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Abstract

The novel traveling fluidization column, designed and built to assure identical operating conditions, was deployed to compare alternate experimental measurement techniques for hydrodynamic characterization of gas-fluidized beds. This paper compares measurements of particle velocity obtained by radioactive particle tracking (RPT—non-invasive at the Ecole Polytechnique), positron emission particle tracking (PEPT—non-invasive at University of Birmingham), optical fibre probes (invasive at UBC) and borescopic high speed particle image velocimetry (invasive at PSRI) carried out with FCC particles of mean diameter 107 μm. All of the techniques provided similar trends with respect to time-average particle velocity profiles, but significant differences were observed in some cases. Analysis of the results, focusing on the physical principles of each measurement technique, provides valuable insights into the reasons for the observed discrepancies. The results also add to a unique hydrodynamic database for validation of CFD and other mechanistic models.
Original languageEnglish
Pages (from-to)310-322
JournalChemical Engineering Science
Volume127
Early online date2 Feb 2015
DOIs
Publication statusPublished - 4 May 2015

Keywords

  • Fluidized beds
  • Particle velocity
  • Optical fiber probes
  • Borescopic PIV
  • Radioactive particle tracking
  • Positron emission particle tracking

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