Detailed measurements of particle velocity and solids flux in a high density circulating fluidized bed riser

Chengxiu Wang, Jesse Zhu, Chunyi Li, Shahzad Barghi

Research output: Journal PublicationArticlepeer-review

33 Citations (Scopus)

Abstract

A comprehensive study of particle velocity and solids flux is conducted in a high density circulating fluidized bed with extremely high solids circulation rate up to 1000kg/m2s, for the first time in the lab-scale settings. Results show that the axial distribution of particle velocity becomes more uniform in such extremely high solids flux conditions than cases with lower solids flux. Radial profiles of particle velocity and solids flux become increasingly steep with increasing solids circulation rate. No net downward flow near the wall is detected, which is considered an important advantage of the high density riser leading to reduced solids backmixing. Correlations of particle velocity against solids holdup are stronger for low density conditions than for high density cases, suggesting that gas-particle interaction dominates in low density risers, while particle-particle interaction plays a key role for the motion of particles in the extremely high density ones.

Original languageEnglish
Pages (from-to)9-20
Number of pages12
JournalChemical Engineering Science
Volume114
DOIs
Publication statusPublished - 26 Jul 2014
Externally publishedYes

Keywords

  • Circulating fluidized bed
  • High density
  • High flux
  • Particle velocity
  • Riser
  • Solids flux

ASJC Scopus subject areas

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

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