Elutriation Mechanism

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The design of a fluidized bed reactor should be done as to minimize the velocity of the entrainment of particles. Two solutions are usually adjusted: to increase the cross section above the bed surface, and to predict the reactor's gas outlet from a height above the TDH. Devices can be added inside or above the bed to reduce the entrainment, e.g., stirrers, grids, vertical and horizontal baffles and cyclones (Geldart, 1986).

The elutriation phenomenon can follow a first order process, i.e., the elutriation velocity of the particle size (dpi) is proportional to the mass fraction (xi) of the particles in the reactor:

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, where 

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is the elutriation constant velocity of particles

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There are several correlations in terms of  proposed in the literature and two of them are summarizing in Table 1:

 

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