Mathematical modelling of urea prilling process

A mathematical model is proposed for the urea prilling process of a commerc ial plant. In this model the prilling process has been simulated by simulta neous solution of the continuity, hydrodynamic, mass and energy transfer eq uations. Particle trajectory, temperature and moisture distribution of the particles and of the cooling air along the height of the tower was calculat ed from the mathematical model. The air temperature profile resulted from t he model was compared with the profile from the urea plant. The model predi cted data were consistent with the plant data indicating the validity of th e model. The result of this work showed that an increase in heat removed fr om the particles would improve the characteristics of the product urea.