Characteristics of the formation of particle wall-layers in CFB boilers
Paper i proceeding, 1995

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.

Fluidiced bed

wall layers

CFB boiler

fluid dynamics


Filip Johnsson

Institutionen för energiomvandling

Wennan Zhang

Institutionen för energiomvandling

Bo G Leckner

Institutionen för energiomvandling

Proc of the 2nd International Conference on Multiphase Flow

Vol. 3 FB1-25-FB1-32-






Chalmers kraftcentral

Mer information