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Macroscopic modelling of fluid dynamics in large-scale circulating fluidized beds

David Pallares (Institutionen för energi och miljö) ; Filip Johnsson (Institutionen för energi och miljö)
Progress in Energy and Combustion Science (0360-1285). Vol. 32 (2006), 5-6, p. 539-569.
[Artikel, refereegranskad vetenskaplig]

Macroscopic (semi-empirical) models for fluid dynamics of circulating fluidized bed (CFB) units are presented, with emphasize on applications for conditions relevant to industrial units such as fluidized-bed combustors. In order to make a structured analysis of the models, the CFB unit is divided into 6 fluid dynamical zones, which have been shown to exhibit different fluid-dynamical behaviour (bottom bed, freeboard, exit zone, exit duct, cyclone and downcomer and particle seal). The paper summarizes the main basis and assumptions for each model together with major advantages and drawbacks. In addition, a practical example on how a selected set of these local models can be linked to an overall model of the fluid dynamics of the entire CFB loop is presented. It is shown that it is possible to reach good agreement between the overall model and experimental data from industrial units.

Nyckelord: Circulating fluidized bed, Fluid dynamics, Modeling

Denna post skapades 2007-01-16. Senast ändrad 2013-05-21.
CPL Pubid: 25649


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Institutioner (Chalmers)

Institutionen för energi och miljö



Chalmers infrastruktur

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Macroscopic modeling of fluid dynamics in large-scale circultaing fluidized beds