NUMERICAL SIMULATION OF A SPOUTED BED WITH A DRAFT TUBE WITH AND WITHOUT LIQUID SPRAY

摘要

Numerical simulations of the gas-solid flow in a flat-based spouted bed with a draft tube(DTSB)are conducted with a Eulerian-Eulerian granular kinetic model.The hydrodynamics of the flow in DTSB is investigated and compared with published experimental data.The effect of the gas velocity on the particles circulation rate is evaluated,and parametric studies of the restitution coefficient are performed.In addition,several different frictional models are tested.A model for the liquid spray injection into a gas-solid flow is proposed and implemented into a commercial CFD solver,Fluent 6.3.The liquid spray introduced through the bottom nozzle is simulated,and the influence of spray rate on solids concentration and velocity inside the draft tube is examined.