Application of the obstruction model to elutriation of more than one species of particles from multicomponent fluidized bed.

Abstract

In the previous paper, the authors proposed a simple model which describes elutriations of one particle species from bubbling fluidized beds made up of one- or two-component particles, by consideration of the obstructive effect due to suspended particles in the freeboard. In this report the proposed model was applied to the elutriations of more than one species of particles from multicomponent fluidized beds consisting of glass beads, FCC particles and iron powders. The applicability of the model to such systems and the obtained best-fit values of the model parameters were examined thoroughly. It was proved that the model also describes well the elutriation of more than one species of particles. The virtual elutriation rate constant in the proposed model, which is one of the model parameters and means the imaginary elutriation rate constant without the obstructive effect, agreed well with the conventional elutriation rate constant predicted by the correlation proposed by Wen and Hashinger.The other parameter kp was in proportion to the reciprocal of the slip velocity.