Flow regimes and axial pressure profiles in a circulating fluidized bed

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The hydrodynamics and flow regime in fast fluidized beds of FCC and silica sand particles were determined in a Plexiglas column (0.1 m i.d. x 5.3 m high). The transport velocity (U-tr) was determined by the emptying time and flooding point determination methods. At a given solid circulation rate, solid holdups in the upper dilute region exhibit their maximum values with variation of gas velocities, where a dense region forms at the bottom of the riser. The gas velocity at which solid holdup in the upper dilute region exhibits a maximum value is defined as the fast transition velocity (U-FT) The fast fluidization regime can be divided into the fast transition region and the fully developed fast fluidization region. A demarcation Line between the two regions is proposed. The fast transition velocity and the transition velocity (U-FD) to pneumatic transport have been correlated. The transition velocity of the fast fluidization region can be predicted by the choking velocity, U-FD and U-FT.(C). 1999 Elsevier Science S.A. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
1999
Language
English
Article Type
Article
Keywords

GAS; TRANSPORT; VOIDAGE; CHOKING

Citation

CHEMICAL ENGINEERING JOURNAL, v.72, no.3, pp.245 - 252

ISSN
1385-8947
DOI
10.1016/S1385-8947(99)00013-3
URI
http://hdl.handle.net/10203/4008
Appears in Collection
CBE-Journal Papers(저널논문)
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