Feasibility Study of Particle Classification in Fluidized Beds with Internal Baf

In a fluidized bed in which the particles vary in size or density segregation can occur.Including horizontal sieve-like baffles in the bed can greatly increase the tendency of powdersto segregate. This can make a fluidized bed particle classification process possible. In thisarticle a feasibility study of such a process is presented.Experiments were performed with a model system. It was found that the baffles increase thepurity of both the ‘flotsam’ and the ‘jetsam’ fractions. The capacity of a fluidized bed particleclassifier can be estimated using a mechanistic model, based o­n literature models. With sucha model we found that the baffles are most effective in systems that tend to segregate but doactually hardly segregate without baffles. The use of fluidization gas by a fluid bed particleclassifier is much smaller than that of a windsifter.



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