When a jet spouts vertically into a fluidized bed with a conical distributor

a jet zone is formed. In this jet zone

agglomerates will be disengaged downward from the fluidized bed consisting mainly of ash particles and then discharged from the jet nozzle. In general

this disengagement process for the agglomerates can be divided into three stages: 1 ) Initial disengagement. 2 ) Stable disengagement. 3 ) Critical disengagement.In this paper the equation obtained for the initial disengagement velocity UIJ is as follows: The difference between experimental and calculated values is less than ±5%. In practice

the flow characteristics and agglomerate disengagement process in the fluidized bed are affected by the geometric configuration of the jet zone. Based on experimental results

a configuration-flow parameter C

is proposed

which may be used as an important criterion for selecting the optimum geometric configuration of nozzle and distributor. Finally

the effect of fine powders on improving the agglomerate disengagement process is examined.