✦ LIBER ✦

Heat transfer in large particle fluidized beds

✍ Scribed by N. Decker; L.R. Glicksman

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 909 KB
Volume: 26
Category: Article
ISSN: 0017-9310
DOI: 10.1016/s0017-9310(83)80062-3

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✦ Synopsis

A physically based model is proposed for heat transfer to immersed surfaces in large particle fluidized beds. ' Large' particlesare distinguished as those with thermal time constants substantially greater than their residencetime at a heat tran sfersurface. At typical fluidized bed combustor operating conditions, particles 1mm orlarger are 'large'. Conduction through the gasnear points ofsolidcontact and convection by the interstitial gas flowboth contribute to heat transfer during emulsion (or dense phase)contact. As particle sizeincreases the heat transfer by gas convection provides a greater share of the heat transfer. It isshown that the gas convectivecomponent in fluidizedbed heat transfer is not simply related to overall gas convectionin a packed or quiescently fluidized bed, The model is shown to provide good agreement with data from several sources.

I'\Ol\lEI'\CLATURE c specific heat of gas

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