Modelling and Simulation of Fluidized Bed Granulator for the Manufacturing of Coated Urea

Abstract

Hydrodynamics of air-urea (gas-solid) flow in fluidized bed coater is studied using the commercial CFD package ANSYS FLUENT® 18.0 on 2D and 3D geometry the multiphase behavior of air-urea flow is simulated using CFD. The model uses the EE-TFM approach in combination with kinetic theory of granular flows. In this study, three different drag models GP, SMB and mod SMB are used. These drag models are used to determine the interfacial phenomena between different phases. It is detected that the drag models have a substantial effect on the air-urea flow behavior and the change in dynamics of urea particles with influence of superficial gas velocity is studied. The modified Syamlal O Brine (modified SMB) shows better agreement with the homogeneous fluidization as compared to Gidaspow (GP) and Syamlal O Brine (SMB) drag model.