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Characteristics of the formation of particle wall-layers in CFB boilers

Filip Johnsson (Institutionen för energiomvandling) ; Wennan Zhang (Institutionen för energiomvandling) ; Bo Leckner (Institutionen för energiomvandling)
Proc of the 2nd International Conference on Multiphase Flow Vol. 3 (1995), p. FB1-25-FB1-32.
[Konferensbidrag, refereegranskat]

The character of the vertical two-phase flow in circulating fluidized bed (CFB)boiler furnaces is compared with results from small CFB risers presented in literature. The particle flow in furnaces as well as in the smaller risers shows a core/wall-layer structure. In the CFB boilers the particle flow pattern develops up through the furnace with the major back-flow caused by separation to the furnace walls. Both the particle wall-layer thickness and the downward flux within this layer increase downwards along the furnace walls. In the smaller units this downward increase is either absent or much smaller, a consequence of a more developed particle flow profile, which, typically, is parabolic in shape.

Nyckelord: Fluidiced bed; fluid dynamics; wall layers; CFB boiler


ICMF'95-KYOTO, Japan Eds A. Serizawa, T. Fukano, and J. Bataille



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Denna post skapades 2016-06-28. Senast ändrad 2016-08-15.
CPL Pubid: 238421

 

Institutioner (Chalmers)

Institutionen för energiomvandling (1900-2003)

Ämnesområden

Energi
Termisk energiteknik

Chalmers infrastruktur

Chalmers Kraftcentral (CK)