Experimental investigation of the behaviour of coarse particles in an interconne

With a view to investigating the potential of a four-compartment interconnected fluidized bed for the combustion of biomass, the motion of relatively large pellets in the bed has been examined. Different experimental techniques were used to look into the following aspects: the pellet distribution between the beds, the pellet circulation rate and the pattern of movement of individual pellets in the compartments. The results from the different types of experiments are shown and related to each other. Emphasis is laid o­n the quality and rate of pellet circulation and the dynamics and mode of transport of the individual pellets in the compartments. Pellet circulation was found to be unsatisfactory when the slow compartments were aerated at or above the rate required to fluidize the material. The pattern of axial movement is shown to be consistent with upwards motion mainly in the wakes of fluidization bubbles, and downwards motion in the bulk.


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