Abstract
A central draught tube in a Ruidised bed can be used to promote solids circulation and prevent the formation of stagnant regions. The dominant driving force for circulation is the difference in voidage between the draught tube and annulus, caused by supplying a larger superficial gas velocity to the base of the draught tube than to the base of the annulus. A theoretical model has been developed, taking into account the effects of shear stress, bubble growth in the draught tube, and the flow of solids from the annular downcomer to the central draught tube. Comparison with experimental work, the results of earlier workers, and unpublished work by British Gas, shows satisfactory agreement over a wide range of bed size with a variety of particles.
Published Version
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