For the first time, an industrial-scale Fluidised-Bed Dryer (FBD) for the largest petrochemical company in Thailand was simulated with an aim of obtaining key operating parameters such as temperature and velocity distributions, evaporation rate, moisture level within solid particles and residence time. The physics involved in such a large reactor is extremely complicated and involves multiphase flow, turbulence, heat transfer, evaporation and particle interaction, etc. Most of the methods and techniques used in this project have never been tried before and this project represents the most comprehensive and successful simulation of a fluidised-bed reactor with an industrial-scale application.