Abstract
The name ‘fast fluidization’ was proposed by Yerushalmi et al. to describe a class of gas-solid fluidized beds with high gas velocity and high solid circulation rates. Although much work has been published on fast fluidization and its applications, a generally accepted definition of fast fluidization is still lacking. In this paper, we propose a definition of fast fluidization. A quantitative flow regime diagram for catalytic cracking catalyst in a column of 0.1 m diameter and 5.5 m high, showing the limiting gas and solid velocities for fast fluidization, is presented. The diagram is obtained from experimental studies in which both solid flowrate and gas flowrate were manipulated independently. Previous work on fast fluidization suffers from the disadvantage that the solid circulation rate cannot be independently manipulated.
Published Version
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