Arraste de partículas finas em um leito fluidizado e eficiência de coleta de um ciclone dipleg

by Cardoso, Cássia Regina

Abstract (Summary)
The system with a fluidized bed and a cyclone dipleg as gas-solid separator is used inindustry in unities of circulating fluidization. Some applications are: the fluid catalyticcracking, to produce gasoline and heating oil and the beds of combustion. The principalvariables to be identified in the cited system are the flux of entrained particles in thebed and the collection efficiency of the cyclone. The present work had the objectivesof studying the entrainment flux of seven fine particles (Geldart A and C) with threedifferent superficial gas velocities in the bed and analyse the collection efficiency of thecyclone dipleg for all the conditions of operation. The experimental results of the twocases were compared to the predicted for models. Three kinds of glass spheres, three kindsos FCC (catalyst used in the fluid catalytic cracking) and one kind os phosphate powderwere the used particles. The gas velocities in the bed were 0, 26, 0, 31 and 0, 36m/s, inthese velocities the bed worked in the regime of fast fluidization, that is the one usedin circulating systems. The particles were characterized and their minimum fluidizationvelocities were inferred. It was possible to observe that with the increasing of the gasvelocity in the bed, the entrainment flux increases; for Geldart A particles, when thefraction of Geldart C solids is higher, the entrainment flux increases and for Geldart Cmaterials, when there is a decrease in mean diameter, the entrainment flux is smaller. Thecyclone is well dimensioned for the unit and presented maximum values of efficiencies forall the analysed cases.
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:Claudio Roberto Duarte; João Jorge Ribeiro Damasceno; Fábio de Assis Ressel Pereira; Carlos Henrique Ataide

School:Universidade Federal de Uberlândia

School Location:Brazil

Source Type:Master's Thesis

Keywords:Fluidodinâmica Fine particles Hydrodynamics Minimum fluidization Entrainment Cyclone dipleg efficiency Fluidização


Date of Publication:03/14/2008

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