Circulating fluidized beds

Chengxiu Wang, Jesse Zhu

Research output: Chapter in Book/Conference proceedingBook Chapterpeer-review

6 Citations (Scopus)


This chapter describes the key characteristics and the key operating parameters, such as superficial gas velocity and solids circulation flux, of circulating fluidized beds (CFBs). It illustrates the nonuniformity of radial profiles of solids distribution in the CFB, as well as mixing of solids and gases in the CFB. Axial and radial distributions (profiles) of the various parameters are often used to characterize the hydrodynamics and reactor performance inside risers, including solids holdups, gas and particle velocities, etc. The chapter discusses the reactor performance of CFBs and the effect of reactor diameter on CFB hydrodynamics. Compared with conventional low-velocity bubbling and turbulent fluidized bed reactors, CFB reactors offer several key advantages. These advantages are achieved at the expense of some reduction in heat transfer coefficients between heat transfer surfaces and the bed (or suspension) and somewhat greater temperature gradients than in dense beds.

Original languageEnglish
Title of host publicationEssentials of Fluidization Technology
Number of pages30
ISBN (Electronic)9783527699476
ISBN (Print)9783527340644
Publication statusPublished - 1 Jan 2020
Externally publishedYes


  • Clusters
  • Core/annulus flow
  • Mixing
  • Pressure profiles
  • Solids circulation flux
  • Solids holdup profiles

ASJC Scopus subject areas

  • Engineering (all)
  • Chemical Engineering (all)


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