Nonlinear analysis of gas-solid flow behavior in fast fluidized bed riser

Xiaoxiang Li, Yanfu Shi, Weixing Huang, Huarui Yu, Jingxu Zhu

Research output: Journal PublicationArticlepeer-review

13 Citations (Scopus)


A fast fluidized bed riser with 16 m height and 0.10 m ID was operated with FCC particles and in a wide range of operating conditions. The superficial gas velocity Ug ranged from 3.5 m·s-1 to 8.1 m·s-1, and the solids circulating rate Gs was from 50kg·m-2·-1 to 201 kg·m-2·s-1. Time series signals of solids holdup fluctuation were measured at a frequency of 900 Hz using an optical fiber located at 8 axial and 11 radial positions. The nonlinear method was used to analyze the time series and consequently Kolmogorov entropy was calculated to describe the dynamic characteristics of the gas-solid flow behavior in the annular-core section. The results showed that Kolmogorov entropy could describe the annular-core flow structure. According to three marked characteristics of Kolmogorov entropy in the radial direction, three flow regions were identified: random-particles-controlled core region, chaotic-particles-controlled transitional region, wall-controlled annulus region. The change of Kolmogorov entropy in the radial direction was also interpreted based on the influence of solids on gas turbulence structures.

Original languageEnglish
Pages (from-to)182-188
Number of pages7
JournalHuagong Xuebao/CIESC Journal
Issue number2
Publication statusPublished - Feb 2004
Externally publishedYes


  • Fast fluidized bed
  • Nonlinear analysis
  • Riser
  • Solids holdup
  • Time series

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)


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