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ABSTRACT
Fluidized beds have high transfer performances and are excellent gas-solid contactors. They thus allow for improving the mass and heat exchanges between a wall and a gas, via notably particle agitation and convection. This article is dedicated to the description of all thermal mass and heat transfers in fluidized bed. It provides access to an estimation of the coefficients of gas-particle transfer, gas-to-particle and wall-to-bed transfer, as well as to the calculation of transfers for a large number of industrial applications, such as the drying of divided solids or the calcination of minerals and , more recently, for the gasification of biomass or waste.
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Gérard ANTONINI: University Professor - Compiègne University of Technology (UTC)
INTRODUCTION
In a first part of the document
The various possible applications of fluidized beds are then described.
Highly efficient mass and heat exchange can be achieved by direct contact between the high-surface-area divided solid and the fluidizing gas, or between the bed and the wall of an immersed exchanger. The fluidized bed is an open, practically isothermal volume, thanks to the high heat capacity of the solids compared with that of the gases, and the particle agitation and hydrodynamic mixing that renew the gas-particle and bed-wall contact surfaces.
This second part is devoted to the description of mass and heat transfer processes in fluidized beds. The main correlations for estimating gas-particle, particle-bed and bed-wall transfer coefficients are provided. These data are applied to the calculation of transfers in a wide range of devices, such as single- or multi-stage open exchangers, dryers or fluidized-bed boilers.
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Fluidized beds
Heat transfer processes in fluidized beds
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