On the basis of years of research on heat energy utilization and drying technology, Tianli has conducted in-depth studies on the drying principle and drying process of rotary dryers. Based on the mechanism of heat and mass transfer, combined with fluid and particle motion models, and on the basis of a large number of experiments, a Computational Fluid Dynamics (CFD) model for the study of the drying process of rotary dryers has been established to ensure that the drying process of materials can be accurately controlled.