The elutriation of fine and cohesive particles from gas fluidized beds

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Experimental work on the entrainment of an FCC powder was carried out in 76 mm and 152 mm glass columns. Fluidization tests were carried out batchwise and continuously at velocities between 0.2 m/s and 0.8 m/s. Non-cohesive fine powders and cohesive superfine powders were added to a coarse base FCC powder in proportions which ensured that the mixture remained within Geldart's Group A. The entrainment rate constant, K(i∞)(*), is found to depend slightly on the fines concentration in the bed. Our work has confirmed that there is a critical particle size at which K(i∞)(*) no longer increases as particle size decreases, and may even decrease. Several mechanisms are postulated to explain this but from the experimental results it is concluded that interparticle adhesion forces between the very fine particles play an important role. An empirical correlation to predict K(i∞)(*), below the point where levelling off occur is proposed.

Original languageEnglish
Pages (from-to)175-195
Number of pages21
JournalChemical Engineering Communications
Volume173
Publication statusPublished - Jun 1999

Fingerprint

Powders
Fluidized beds
Gases
Particle size
Air entrainment
Fluidization
Rate constants
Adhesion
Glass

Keywords

  • Elutriation rate constant
  • Entrainment
  • Entrainment flux
  • Fines
  • Fluidized bed
  • Superfines

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

The elutriation of fine and cohesive particles from gas fluidized beds. / Tasirin, Siti Masrinda; Geldart, D.

In: Chemical Engineering Communications, Vol. 173, 06.1999, p. 175-195.

Research output: Contribution to journalArticle

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