Effects of internals and distributors on the distribution and growth of bubbles in the conventional gas–solid fluidized bed

Haidong Zhang, Zeneng Sun, Chengguo Liu, Shurui Dong, Yuanyuan Shao, Jesse Zhu

Research output: Journal PublicationArticlepeer-review

4 Citations (Scopus)

Abstract

The effects of internals and gas distributors on the local dynamics of the bubbles in the conventional gas–solid fluidized bed were studied. Mesh-type internals with different opening areas (50%, 70% and 90%) and different arrangements (two-layer and four-layer); and a sintered plate with a smaller pore size (1 μm) and a perforated plate with a larger pore size as distributors were investigated. Differential pressure drops and local solids holdups were measured under various superficial gas velocities to compare the performances of the different types of internals and distributors. The instantaneous solids holdup signals from the optical fibre probe were used to further examine the local bubble dynamics in detail. Smaller bubbles were found, with the installation of internals or using the sintered plate, resulting in lower pressure drops and a higher bed expansion. Internals with reduced opening area or distributor with smaller pore size further leads to a higher changeover rate between the bubbles and dense phase, both axially and radially, and hence a better gas–solid contacting and an earlier transition to the turbulent flow regime of the bed.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalParticuology
Volume55
DOIs
Publication statusPublished - Apr 2021
Externally publishedYes

Keywords

  • Bubble dynamics
  • Flow regime transition
  • Gas distributor
  • Gas–solid fluidized bed
  • Internal

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Materials Science (all)

Fingerprint

Dive into the research topics of 'Effects of internals and distributors on the distribution and growth of bubbles in the conventional gas–solid fluidized bed'. Together they form a unique fingerprint.

Cite this