Fluidization characteristics of oil palm frond particles in agitated bed

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6 Citations (Scopus)

Abstract

Fluidization characteristics of crushed oil palm fronds were studied. The elongated shape of the particles and their fibrous nature created entanglement between the particles and caused the bed to form crack and plug flow when aerated in ordinary fluidized bed. Fluidization of the fibres became feasible with the aid of mechanical agitation. Agitation helped to loosen the entanglement of the fibres which prevents air to pass through the bed of particles, as a result, fluidization state could be attained. Experiments were carried out in a column with height of 72. cm and ID of 14.4. cm. Superficial air velocities used ranged from 0.1 to 1.1. m/s, bed heights ranged from 4 to 8.5. cm, agitation speeds ranged from 300 to 500. rpm and particle initial moisture contents from 0.5 to 2.4. g. water/g. dry solids. Analysis of the fluidization characteristics showed that minimum fluidization velocity was independent with bed height and agitation speed. However, investigation on the effect of particle initial moisture content showed that minimum fluidization velocity increased with particle moisture content. A new empirical correlation to predict minimum fluidization velocity has been derived which gives good agreement with experimental data in this study and the data from other study in the literature.

Original languageEnglish
Pages (from-to)497-507
Number of pages11
JournalChemical Engineering Research and Design
Volume91
Issue number3
DOIs
Publication statusPublished - Mar 2013

Fingerprint

Palm oil
Fluidization
Moisture
Fibers
Air
Fluidized beds
Cracks
Water

Keywords

  • Agitated fluidized bed
  • Fibres
  • Hydrodynamics
  • Incipient fluidization
  • Minimum fluidization velocity
  • Stirred fluidized bed

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

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title = "Fluidization characteristics of oil palm frond particles in agitated bed",
abstract = "Fluidization characteristics of crushed oil palm fronds were studied. The elongated shape of the particles and their fibrous nature created entanglement between the particles and caused the bed to form crack and plug flow when aerated in ordinary fluidized bed. Fluidization of the fibres became feasible with the aid of mechanical agitation. Agitation helped to loosen the entanglement of the fibres which prevents air to pass through the bed of particles, as a result, fluidization state could be attained. Experiments were carried out in a column with height of 72. cm and ID of 14.4. cm. Superficial air velocities used ranged from 0.1 to 1.1. m/s, bed heights ranged from 4 to 8.5. cm, agitation speeds ranged from 300 to 500. rpm and particle initial moisture contents from 0.5 to 2.4. g. water/g. dry solids. Analysis of the fluidization characteristics showed that minimum fluidization velocity was independent with bed height and agitation speed. However, investigation on the effect of particle initial moisture content showed that minimum fluidization velocity increased with particle moisture content. A new empirical correlation to predict minimum fluidization velocity has been derived which gives good agreement with experimental data in this study and the data from other study in the literature.",
keywords = "Agitated fluidized bed, Fibres, Hydrodynamics, Incipient fluidization, Minimum fluidization velocity, Stirred fluidized bed",
author = "Ifa Puspasari and {Meor Talib}, {Meor Zainal} and {Wan Daud}, {Wan Ramli} and Tasirin, {Siti Masrinda}",
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AU - Puspasari, Ifa

AU - Meor Talib, Meor Zainal

AU - Wan Daud, Wan Ramli

AU - Tasirin, Siti Masrinda

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N2 - Fluidization characteristics of crushed oil palm fronds were studied. The elongated shape of the particles and their fibrous nature created entanglement between the particles and caused the bed to form crack and plug flow when aerated in ordinary fluidized bed. Fluidization of the fibres became feasible with the aid of mechanical agitation. Agitation helped to loosen the entanglement of the fibres which prevents air to pass through the bed of particles, as a result, fluidization state could be attained. Experiments were carried out in a column with height of 72. cm and ID of 14.4. cm. Superficial air velocities used ranged from 0.1 to 1.1. m/s, bed heights ranged from 4 to 8.5. cm, agitation speeds ranged from 300 to 500. rpm and particle initial moisture contents from 0.5 to 2.4. g. water/g. dry solids. Analysis of the fluidization characteristics showed that minimum fluidization velocity was independent with bed height and agitation speed. However, investigation on the effect of particle initial moisture content showed that minimum fluidization velocity increased with particle moisture content. A new empirical correlation to predict minimum fluidization velocity has been derived which gives good agreement with experimental data in this study and the data from other study in the literature.

AB - Fluidization characteristics of crushed oil palm fronds were studied. The elongated shape of the particles and their fibrous nature created entanglement between the particles and caused the bed to form crack and plug flow when aerated in ordinary fluidized bed. Fluidization of the fibres became feasible with the aid of mechanical agitation. Agitation helped to loosen the entanglement of the fibres which prevents air to pass through the bed of particles, as a result, fluidization state could be attained. Experiments were carried out in a column with height of 72. cm and ID of 14.4. cm. Superficial air velocities used ranged from 0.1 to 1.1. m/s, bed heights ranged from 4 to 8.5. cm, agitation speeds ranged from 300 to 500. rpm and particle initial moisture contents from 0.5 to 2.4. g. water/g. dry solids. Analysis of the fluidization characteristics showed that minimum fluidization velocity was independent with bed height and agitation speed. However, investigation on the effect of particle initial moisture content showed that minimum fluidization velocity increased with particle moisture content. A new empirical correlation to predict minimum fluidization velocity has been derived which gives good agreement with experimental data in this study and the data from other study in the literature.

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KW - Stirred fluidized bed

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