Bed-to-wall heat transfer in a downer reactor

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The effects of superficial gas velocity (0.5 to 4.5 m/s), solid circulating rate (0 to 40 kg/m(2).s), suspension density (0 to 19 kg/m(3)) and particle sizes (83, 103, 163, 236 mu m) on the bed-to-wall heat transfer coefficient have been determined in a downer reactor (0.1 m I.D. x 3.5 m high). Bed-to-wall heat transfer coefficient increases with increasing suspension density. The heat transfer coefficient by gas convection played a significant role, especially at lower solid circulation rates or suspension densities and larger particle sizes. At a given particle suspension density in the downer reactor, the heat transfer coefficient increases with decreasing particle size. A model is proposed to predict the bed-to-wall heat transfer coefficient in a downer reactor.
Publisher
CANADIAN SOC CHEMICAL ENGINEERING
Issue Date
1999
Article Type
Article
Keywords

CIRCULATING FLUIDIZED-BED; HYDRODYNAMICS; SOLIDS

Citation

CANADIAN JOURNAL OF CHEMICAL ENGINEERING, v.77, no.2, pp.207 - 212

ISSN
0008-4034
URI
http://hdl.handle.net/10203/5680
Appears in Collection
CBE-Journal Papers(저널논문)
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