SOLID MIXING BEHAVIOR IN BUBBLING FLUIDIZED-BEDS

For better understanding of particle mixing behavior in fluidized beds , the concentration of tracer particle was measured in a rectangular f luidized bed to examine horizontal and axial particle mixing character istics in a fluidized bed. The experiments were performed both by taki ng images at the bed wall with a CCD camera and by analyzing the image s with an image digitizer. Two kinds of lime stone particles were sele cted to examine the influence of particle size on the mixing. As a res ult, a large scale particle circulation developed in the bed largely a ffects on solid mixing in bed wall region. The mixing in the center re gion and bottom region of fluidized bed are governed by movements of b ubbles.