Particle velocity and flow development in a long and high-flux circulating fluidized bed riser

J. H. Pärssinen, J. X. Zhu

Research output: Journal PublicationArticlepeer-review

99 Citations (Scopus)

Abstract

In a 10 m tall and 76 mm i.d. high-flux riser, radial profiles of particle velocities were determined with a five-fiber optic probe on seven axial levels, with solids circulation rate (solids flux) up to 550 kg/m2s and superficial gas velocity up to 10 m/s. This study shows a more comprehensive set of radial profiles under higher fluxes than any previous literature. Four axial stages of flow development were distinguished based on radial distributions of particle velocity and concentration. Compared to low-flux operations ( < 200 kg/m2s), the radial profiles of particle velocity are significantly less uniform at high-flux operations ( > 300 kg/m2s). The superficial gas velocity has more influence on the radial velocity profiles than the solids flux at high solids flux. Net solids downflow only occurs near the wall under limited conditions in the bottom section.

Original languageEnglish
Pages (from-to)5295-5303
Number of pages9
JournalChemical Engineering Science
Volume56
Issue number18
DOIs
Publication statusPublished - 20 Sep 2001
Externally publishedYes

Keywords

  • Circulating fluidized bed
  • Five-fiber optic probe
  • High solids circulation rate
  • Radial particle velocity profile

ASJC Scopus subject areas

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

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