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Effects of particle properties on fluidization characteristics of coarse particles

机译：颗粒特性对粗颗粒流化特性的影响

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Fluidized-bed reactors can be operated in different flow regimes. Since the gas-solid contacting modes vary as the fluidization regimes change, results obtained from one flow regime for a particulate material can not be applied to another (Grace, 1986). Ascertaining flow regimes of operation is, therefore, essential for design and scaleup of fluidized-bed reactors as well as for reactor performance predictions. During the past decades, considerable research efforts have been spent on flow regime studies for fine particles (Geldart's group A and group B powder). Most of the available data has been obtained with small laboratory-scale units of 15 cm diameter or less. Most fossil energy fluidized bed combustors have used coarse particles as bed material for economic reasons. For example, both bubbling and circulating fluidized bed combustion systems have used coarse coal and limestone particles. It is the objective of this study to better understand the various flow regimes and their transitions from: incipient fluidization to high velocity fluidization using coarse particles in a 30 cm diameter atmospheric fluidized bed cold model. Results of this investigation on high velocity fluidization process will be helpful in predicting operational characteristics and improving circulating fluidized-bed reactor design and scale up for fossil energy applications.

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