Numerical and experimental studies on the flow multiplicity phenomenon for gas-solids two-phase flows in CFB risers

B. Peng, J. Xu, J. Zhu, C. Zhang

Research output: Journal PublicationArticlepeer-review

21 Citations (Scopus)

Abstract

The flow multiplicity phenomenon in circulating fluidized bed (CFB) risers, i.e. under the same superficial gas velocity and solids circulation rate, the CFB risers may sometimes exhibit multiple flow structures, was numerically and experimentally investigated in this study. To investigate the flow multiplicity phenomenon, the experiments of gas-solids two-phase flows in a 2-D CFB riser with different flow profiles at the inlet of the CFB riser were conducted. Specially designed gas inlet distributors with add-ons are used to generate different flow profiles at the inlet of the CFB rise. The CFD model using Eulerian-Eulerian approach with k-ε turbulence model for each phase was employed to numerically analyze the flow multiplicity phenomenon. It is experimentally and numerically proved that for gas-solids two-phase flows, the flow profiles in the fully-developed region are dominated by the flow profiles at the inlet. The solids concentration profile is closely coupled with the velocity profile, and the inlet solids concentration and velocity profiles can largely influence the fully-developed solids concentration and velocity profiles.

Original languageEnglish
Pages (from-to)177-187
Number of pages11
JournalPowder Technology
Volume214
Issue number2
DOIs
Publication statusPublished - 10 Dec 2011
Externally publishedYes

Keywords

  • CFB riser
  • CFD simulation
  • Experimental study
  • Flow multiplicity phenomenon
  • Gas-solids two-phase flow

ASJC Scopus subject areas

  • Chemical Engineering (all)

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