A pressure drop model for circulating fluidised bed

A model for solids concentration and two phase pressure drop in the riser o f circulating fluidised bed is proposed. It is based on slip velocity and t akes into consideration buoyancy effects, hindrance effects and the formati on of particle agglomerates. The local and average pressure drop and solids concentration were measured in a circulating fluidised bed for Geldart A and B group materials: a wide range of phase velocities and particle characteristics was covered. The exp erimental data of the present work and those reported in literature were co mpared with the predictions obtained by the model.