Measuring Particle Velocity Distribution in Circulating Fluidized Bed

A laboratory circulating fluidized bed (CFB) unit was conducted in a 6 cm i. d. , 150 cm high riser made up of Plexiglas, operated under ambient conditions and various sizes of particles and different superficial gas velocities. The air-solid flow behavior of the CFB riser was video recorded and the videos were analyzed to determine the average particles distribution. Increasing the superficial air velocity caused increasing in the average particle velocities but increasing the particles size caused decreasing the average particles velocity.