Numerical simulation of fluidized bed coating process considering particle abrasion

A coupled methodology was developed to model the fluidized bed coating process considering particle abrasion. Interactions of gas phase, particle phase and droplet phase were coupled with multiphase flow. Evaporation, coating and abrasion models were involved and verified by experimental data. The coupled method was evaluated by NaCl coating cases. Under the conditions of two experimental cases, quantitative proportion of the adhered precipitation abrased from the coated particle surface was obtained, which is attributed to frequent particle collisions. Another fluidized bed coating process, in-situ preparation of the Calcium-based supported sorbent for flue gas desulfurization, was simulated to validate the coupled model and investigate the effects of operating conditions on the net coating efficiency. When the nozzle was arranged near the dense phase zone, the conditions had little effect on the efficiency. Otherwise, higher efficiency can be achieved by increasing the bed inventory, droplet diameter, and droplet initial velocity. This research offers an efficient approach for modeling of fluidized bed coating process where particle abrasion is exigent, as well as providing guidelines for practical application of in-situ desulfurizer preparation.