Mass transfer in dense-phase fluidized beds

1 Mass Transfer in Dense-Phase Fluidized Beds 

In a dense-phase fluidized bed (see Chapter 9), mass transfer can take place between the particle and the gas, between the bubble and the emulsion, and between the bed and the surface. These processes are discussed in the following. 

Under fairly low gas velocity conditions where U is close to t/mf or the bed is in particulate fluidization, the plug flow assumption for the gas phase can be reasonably made [Wen and Fane, 1982]. Considering the sublimation of species A from the solid phase to the gas phase, the mass balance on the concentration for species A in the gas phase, Ca, over the incremental height AH can be expressed as 

12 / Heat and Mass Transfer Phenomena in Fluidization Systems 

Equation (12.71) provides a means to quantify kf on the basis of experimentally measured inlet and outlet concentrations of species A in the bed under low gas velocity conditions. Wen and Fane (1982) proposed the following empirical correlations for overall mass transfer coefficients in gas-solid fluidized beds, using the experimental data of Kato et al. (1970) based on Eq. (12.71)  

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See also in sourсe #XX -- [ , , , ]

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