Estudos dos fenomenos de mistura e segregação em leitos fluidizados de particulas polidispersas

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

In this work the mixing and segregation phenomena of polydisperse particles (quaternaries) belonging to the A and B Geldart s groups are investigated. The fluidization column have been constructed with a internal diameter of 0.92 m and height of 2 m. The influence of operating factors in the degree axial mixing of the bed, like excess velocity (U- U IND. E ) and fluidization time, as well as design, like distributor free area, and of the characteristcs of the constituents of mixture (mean diameter of mixture/jetsam concentration) were analised. Four mixtures that allowed the study of the phenomena of mixing and segregation in beds of same or different densities were used. A radial mapping of the bed was performed. The axial profile results show that the use of a velocity high enough for complete fluidization and the use of a distributor with large free area promote the mixing in a small time interval. The increment of excess velocity improves the mixing in the beds, mainly by larger quantity of bubbles. A larger free area improves the bed homogenezation, reducing the dead zones near the distributor. The increment ofjetsam concentration hampers the mixing process. The radial mapping confirm that for the velocity of complete fluidization the particles are well mixed

ASSUNTO(S)

leito fluidizado (pirometalurgia) mixing-segregation fluidization fluidização polydisperese particles

ACESSO AO ARTIGO

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