Radial solids flow structure in a liquid-solids circulating fluidized bed

Ying Zheng, Jing Xu Zhu, Narenderpal S. Marwaha, Amarjeet S. Bassi

Research output: Journal PublicationArticlepeer-review

93 Citations (Scopus)

Abstract

Radial flow structure was studied using a fiber-optical probe in a 7.6cm ID and 3.0m high liquid-solids circulating fluidized bed (LSCFB). Radial solids holdup profiles were obtained at four different heights for glass beads and plastic beads of mean diameters 508 and 526μm, respectively. The results show that local suspension densities are greater near the wall than in the center of the riser for both types of particles, confirming the existence of the radial non-uniformity. Under the same cross-sectional average solids holdup, the radial profiles of solids holdup are the same for each type of particle system under different operating conditions, but the light particles (plastic beads) show a flatter radial profile than the relatively heavier particles (glass beads). Discussion on the solids acceleration explains why a non-uniform axial profile in the LSCFB only exists for very heavy particles and only under limited operating conditions.

Original languageEnglish
Pages (from-to)141-150
Number of pages10
JournalChemical Engineering Journal
Volume88
Issue number1-3
DOIs
Publication statusPublished - 28 Sep 2002
Externally publishedYes

Keywords

  • Liquid-solids circulating fluidized bed
  • Radial non-uniformity
  • Solids acceleration
  • Solids holdup distribution

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry
  • Chemical Engineering (all)
  • Industrial and Manufacturing Engineering

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