Model for Large Particles

The flow of gas through the bed (of cross-sectional area A,) is the sum of the flows through the emulsion and bubble regions  

The fraction of gas which passes through the emulsion region is given by  

Since most (if not all) of the solid is in the emulsion region, equation 23.4-23 may be used in a plug-flow model to represent the contact efficiency of the gas and solid. The resulting expression to determine the conversion is, for a first-order reaction, 

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Park, D., 0. Levenspiel and T.J. Fitzgerald. Plume Model for Large Particle Fluidized Bed Combustors. Fuel, 60 (1981) 295-306. 

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