The entrainment of fines and superfines from fluidized beds

Siti Masrinda Tasirin, D. Geldart

Research output: Contribution to journalArticle

2 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, Kioo*, 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 Kioo* 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 Kioo*, below the point where levelling off occur is proposed.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalPowder Handling and Processing
Volume10
Issue number3
Publication statusPublished - 1998

Fingerprint

Powders
Fluidized beds
Particle size
Fluidization
Rate constants
Adhesion
Glass

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Mechanical Engineering

Cite this

The entrainment of fines and superfines from fluidized beds. / Tasirin, Siti Masrinda; Geldart, D.

In: Powder Handling and Processing, Vol. 10, No. 3, 1998, p. 263-268.

Research output: Contribution to journalArticle

Tasirin, SM & Geldart, D 1998, 'The entrainment of fines and superfines from fluidized beds', Powder Handling and Processing, vol. 10, no. 3, pp. 263-268.
Tasirin, Siti Masrinda ; Geldart, D. / The entrainment of fines and superfines from fluidized beds. In: Powder Handling and Processing. 1998 ; Vol. 10, No. 3. pp. 263-268.
@article{391332642977490a9326ffd4c209f9d7,
title = "The entrainment of fines and superfines from fluidized beds",
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, Kioo*, 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 Kioo* 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 Kioo*, below the point where levelling off occur is proposed.",
author = "Tasirin, {Siti Masrinda} and D. Geldart",
year = "1998",
language = "English",
volume = "10",
pages = "263--268",
journal = "Powder Handling and Processing",
issn = "0934-7348",
publisher = "Trans Tech Publications",
number = "3",

}

TY - JOUR

T1 - The entrainment of fines and superfines from fluidized beds

AU - Tasirin, Siti Masrinda

AU - Geldart, D.

PY - 1998

Y1 - 1998

N2 - 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, Kioo*, 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 Kioo* 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 Kioo*, below the point where levelling off occur is proposed.

AB - 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, Kioo*, 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 Kioo* 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 Kioo*, below the point where levelling off occur is proposed.

UR - http://www.scopus.com/inward/record.url?scp=0032108149&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032108149&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0032108149

VL - 10

SP - 263

EP - 268

JO - Powder Handling and Processing

JF - Powder Handling and Processing

SN - 0934-7348

IS - 3

ER -