Axial solids flow structure in a high density gas-solids circulating fluidized bed downer

Chengxiu Wang, Chunyi Li, Jesse Zhu

Research output: Journal PublicationArticlepeer-review

33 Citations (Scopus)

Abstract

Axial flow behaviors are investigated with an optical fiber probe using FCC particles at extremely high solids circulation rates up to 700kg/m2s and superficial gas velocity ranging from 3-7m/s in a laboratory-scale downer system. Results show that axial distributions of particle velocity and solids holdup are significantly affected by the operating conditions. Superficial gas velocity is the predominance for particle velocity distribution while solids circulation rate plays a key role in solids holdup distribution. Development of solids flow can be accelerated by increasing superficial gas velocity and/or decreasing solids circulation rate. High solids holdup, higher than 0.06, can be achieved in the entire downer with relatively uniform axial profiles at solids circulation rate of 700kg/m2s indicating a preferential flow with reduced backmixing in the downer.

Original languageEnglish
Pages (from-to)153-164
Number of pages12
JournalPowder Technology
Volume272
DOIs
Publication statusPublished - 1 Mar 2015
Externally publishedYes

Keywords

  • Circulating fluidized bed downer
  • Flow development
  • High density
  • Hydrodynamics
  • Particle velocity
  • Solids holdup

ASJC Scopus subject areas

  • Chemical Engineering (all)

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