3D numerical simulation of gas-solid hydrodynamics and coal combustion in an industrial scale circulating fluidized bed

摘要

In this study, three dimensional numericalsimulation of gas and sand particlehydrodynamics along with coal combustion in anindustrial scale circulating fluidized bed (CFB)(including riser, cyclone and return leg) wascarried out using a commercial code, ANSYSFLUENT. For modeling sand and gashydrodynamics, Eulerian-Eulerian method(multiphase granular model), was used while formodeling coal particle trajectories, Eulerian-Lagrangian method (discreet phase model, DPM)was used. Also gas phase chemical reactionswere solved via the Finite-Rate/Eddy-Dissipationmodel and particle phase chemical reaction weresolved by multiple reaction model. User definedfunction (UDF) was used to re-inject the sandparticles which left the domain via cycloneoutlet. Simulation results such as exit gastemperature, sand volume fraction, pressure loop,and mole fraction of combustion products werecompared with real data obtained from a 340MWe CFB boiler located in Yeosu, Korea andshowed good agreement.