Numerical Research on the Drying Process of Single Lignite Particle by High Temperature Flue Gas

The technology of downstream vibrated bed dryer with high temperature flue gas has been applied successfully by CPI Mengdong Energy Group Co., LTD for the large scale upgrading of Baiyinhua lignite. It is very necessary to study the drying process of a single lignite particle by high temperature flue gas. Based on finite volume method, the numerical simulation was applied in the lignite drying process and the mathematical model for the drying process of a single spherical lignite particle with high temperature flue gas was developed. Here, the lignite particle was divided into dry region and wet region by water evaporation interface. To accelerate convergence and make stable domain larger and truncation error smaller in the solution process, Crank-Nicolson six-point difference iteration method was used to solve the model.