Effects of pressure on flow characteristics in a pressurized circulating fluidized bed

摘要

The effects of operating pressure on the gas-solid flow characteristics in a pressurized circulating flu-idized bed(CFB)gasification system were studied by experiment and simulation.Elevated operating pressure was found to increase the particle uniformity in the axial and radial directions.Experiments and simulations both showed that as the operating pressure increased,the pressure drops along the riser height decreased.The experimental pressure drops at the same locations decreased when the operating pressure increased,but the opposite trend was observed in the simulation results.A proper drag model must be developed for the accurate simulation of pressurized CFB operation,and the accuracy of electri-cal capacitance tomography(ECT)measurement and cross-correlation analysis should be improved for better prediction of the particle circulation flux.