Friction between gas-solid suspension and CFB downer wall

Xiaobo Qi, Hui Zhang, Weixing Huang, Jingxu Zhu, Yanfu Shi

Research output: Journal PublicationArticlepeer-review

Abstract

To investigate the friction between gas-solid suspension and the internal wall of the circulating fluidized bed (CFB) downer, the difference between apparent and actual solids holdup was studied by measuring pressure gradients and local solids concentrations in a 9.3 m high CFB downer with FCC particles. A new model to predict pressure drop due to friction between gas-solid suspension and internal wall in the fully developed region of CFB downers was developed. The results showed that the friction between gas-solid suspension and the downer internal wall caused a significant deviation of the apparent solids holdups from the actual ones, especially under higher superficial gas velocity and solids circulation rate. When superficial gas velocity was greater than 8 m·s-1, the actual solids holdups in the fully developed region of the downer could be up to 2-3 times of the apparent values. After the frictional pressure drop was considered, the predicted actual solids holdups by the proposed model agreed well with the experimental values from this work and in the literatures.

Original languageEnglish
Pages (from-to)1685-1690
Number of pages6
JournalHuagong Xuebao/CIESC Journal
Volume58
Issue number7
Publication statusPublished - Jul 2007
Externally publishedYes

Keywords

  • Circulating fluidized bed
  • Downer
  • Friction
  • Fully developed section
  • Gas-solid two-phase flow

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)

Fingerprint

Dive into the research topics of 'Friction between gas-solid suspension and CFB downer wall'. Together they form a unique fingerprint.

Cite this