Hydrodynamics of interconnected fluidized beds for chemical-looping combustion
The hydrodynamics of an interconnected fluidized bed(circulating bed and spouted bed)with CaSO4 oxygen carriers(dp= 0.6 mm)was investigated experimentally.Based on vertical pressure distribution,two zones of different flow regimes(bubbling zone and fast fluidization zone)in the circulating bed(air reactor)and three zones of different flow regimes(spouting zone,bubbling zone,and freeboard)in the spouted bed(fuel reactor)were found to exist.The effects of fluidizing and spouting gas velocities on gas leakage,solids circulating rate and pressure drop were studied.On the basis of experiments,reasonable operation parameters were recommended,which can be used as a reference for further study.