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Hydrodynamic scale-up of circulating fluidized beds

The effects of scale-up on the hydrodynamics of circulating fluidized beds (CFB) are investigated using a single cold laboratory facility with the ability to recycle fluidization gas mixtures of adjustable kinematic viscosity. Tests are conducted with a plastic powder and glass beads to simulate the high-temperature fluidization in CFB risers of 0.32 and 0.46m diameter, respectively. The hydrodynamic simulation is achieved by matching five dimensionless parameters. Particular care is taken to eliminate electrostatics from the bed using traces of an anti-static additive. Comparisons of the vertical static pressure profiles obtained with the plastic and glass powders indicate that the dimensional analysis yields the correct analogy for the global hydrodynamics of CFB risers. 18 refs., 6 figs., 1 tab.