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Heat transfer mechanisms in gas fluidized beds. Part 3: Heat transfer in circulating fluidized beds

✍ Scribed by Prof. Dr.-Ing. Otto Molerus; Dr.-Ing. Wolfgang Mattmann

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 340 KB
Volume: 15
Category: Article
ISSN: 0930-7516
DOI: 10.1002/ceat.270150502

No coin nor oath required. For personal study only.

✦ Synopsis

Part 1 of this contribution reported on the effects of system properties on heat transfer between heating or cooling surfaces and bubbling fluidized beds. This investigation produced four correlations which define the respective maximum heat transfer. Part 2 of this study suggests that the heat transfer between exchanger surfaces and bubbling fluidized beds depends on superficial gas velocity, expressed as dimensionless excess gas velocity. The present paper shows that heat transfer coefficients in circulating fluidized beds can be predicted by evaluation of a state diagram, which combines three dimensionless groups: Nusselt number, Archimedes number and a dimensionless pressure gradient. A comparison of coal combustion experiments with own cold model measurements indicates that the radiative component of heat transfer coefficients is only evident at very low dimensionless pressure gradients.

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