Solid flux in a circulating fluidized bed riser

Antonio Salvaterra, D. Geldart, R. Ocone

Research output: Contribution to journalArticle

Abstract

This work is aimed at exploring the flow structure of a gas-solid suspension in a circulating fluidized bed (CFB) riser. A cold model of a CFB 6.2 m high and 0.152 m diameter was used, with sand particles of 200 µm volume mean diameter and of density 2646 kg m-3 (i.e. Geldart B particle). A non-isokinetic sampling technique was used to explore the flow structure at five angular and three axial positions along the riser. Although a good symmetric profile of solid flux around the riser was found over a wide range of operating conditions, non-symmetric profiles were also observed. Some distinctive features of the radial profile of solid i.e. the existence of the peaks located around radial positions r/RT = ±0.6 were found. Although some researchers attributed this peculiarity to the behaviour of Geldart A powder, in this work as well as in some others in the literature, this feature was found for sand particles belonging to Geldart B class. © 2005 Institution of Chemical Engineers.

Original languageEnglish
Pages (from-to)24-29
Number of pages6
JournalChemical Engineering Research and Design
Volume83
Issue number1 A
DOIs
Publication statusPublished - Jan 2005

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risers
beds
sands
profiles
solid suspensions
engineers
sampling
gases

Keywords

  • Circulating fluidized bed
  • Geldart A and B particles
  • Non-isokinetic

Cite this

Salvaterra, Antonio ; Geldart, D. ; Ocone, R. / Solid flux in a circulating fluidized bed riser. In: Chemical Engineering Research and Design. 2005 ; Vol. 83, No. 1 A. pp. 24-29.
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Solid flux in a circulating fluidized bed riser. / Salvaterra, Antonio; Geldart, D.; Ocone, R.

In: Chemical Engineering Research and Design, Vol. 83, No. 1 A, 01.2005, p. 24-29.

Research output: Contribution to journalArticle

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AB - This work is aimed at exploring the flow structure of a gas-solid suspension in a circulating fluidized bed (CFB) riser. A cold model of a CFB 6.2 m high and 0.152 m diameter was used, with sand particles of 200 µm volume mean diameter and of density 2646 kg m-3 (i.e. Geldart B particle). A non-isokinetic sampling technique was used to explore the flow structure at five angular and three axial positions along the riser. Although a good symmetric profile of solid flux around the riser was found over a wide range of operating conditions, non-symmetric profiles were also observed. Some distinctive features of the radial profile of solid i.e. the existence of the peaks located around radial positions r/RT = ±0.6 were found. Although some researchers attributed this peculiarity to the behaviour of Geldart A powder, in this work as well as in some others in the literature, this feature was found for sand particles belonging to Geldart B class. © 2005 Institution of Chemical Engineers.

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