Numerical simulation of temperature dependency of hydrodynamic Behavior in a fluidization bed of coarse granules

To explore hydrodynamic behavior of fluidized bed under different temperature, numerical simulation was performed in a two-dimensional fluidized bed with 11000 spherical particles of 3mm in diameter. Eulerian approach was used to describe the gas flow and the discrete element method (DEM) based on Lagrangian approach was applied to treat the movement of particles. It was shown that there is a complex relationship between the minimum fluidizing velocity and temperature, whereas minimum fluidizing Reynolds number decreases with temperature increasing until it descends more smoothly over the temperature of 800K. The fluidized bed can run more steadily in high temperature than in room temperature, because expansion ratio of bed are decreased. At 1700K, majority of granules in emulsion phase retain a quasi-packing state with fluidization number increasing.