Abstract：Various models of predicting agglomerate size of ultrafine particles in fluidized beds were classified and reviewed in accordance with the formation mechanism of agglomerate and different analytical methods. The agglomerate size calculated by these models were compared with the experimental results. The results show that each model only predicts the agglomerate size under their experimental conditions and its adaptability is poor. To achieve widely applicable agglomerate size prediction model, careful researches should be positioned to the formation mechanism of agglomeration, the calculation of various acting forces and the selection of parameters, which will yield more practical mechanism model.

Keywords: agglomerate size; prediction model; force balance modelling; energy balance modelling