A model for chemical reaction in the entry region of a gas fluidised-bed reactor

Contrary to what was often imagined, gas enters a bed of fluidised particles in the form of bubbles as if entering a true liquid. This fact has been unambiguously shown by X-ray ciné photograhy over a wide range of conditions which additionally reveals a substantially constant bubbling frequency of...

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Bibliographic Details
Published in:Chemical Engineering Science 1993, Vol.48 (14), p.2519-2524
Main Author: Rowe, P.N.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Reactors
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Summary:Contrary to what was often imagined, gas enters a bed of fluidised particles in the form of bubbles as if entering a true liquid. This fact has been unambiguously shown by X-ray ciné photograhy over a wide range of conditions which additionally reveals a substantially constant bubbling frequency of 8 per second at each point of entry. This fact leads to a simple hydrodynamic model that describes the history of contact between gas and particles during the brief formation process which, combined with chemical kinetics, explains the high rate of reaction commonly observed in a shallow entry region. The model predicts that conversion is unlikely to be changed by alterations to the distributor design.
ISSN:0009-2509
1873-4405
DOI:10.1016/0009-2509(93)80264-Q