Comportamento do hidrociclone filtrante frente às modificações no diâmetro de underflow e no tubo de vortex finder

by Koboldt Almeida, Celso Augusto

Abstract (Summary)
Filtering hydrocyclones are similar equipaments to the conventional hydrocycloneexcept by the fact they have filtering conical region. In this way, during the operation of thisequipament, besides the feed streams, the underflow and the overflow, observed commonly,the porous conical region produces liquid by the filtration process. The filtration in the conicalregion of the hydrocyclone is able to reduce the Euler number and increase the particulatematerial collection efficiency in this type of centrifugal separator, verified by the experimentalresults, despite the low filtered rate. In this context, VIEIRA (2006) obtained a hydrocyclonewith optimal geometry, denominated HF11, using techniques of CFD validated byexperimental data. This optimal filtering hydrocyclone allowed to obtain results with lowEuler numbers and high collection efficiencies. In order to give continuity to the studiesmentioned previously, this work is aimed at examining the influence of the vortex finderlength and the underflow diameter about the solid-liquid separation process in the filteringhydrocyclone HF11 and in the conventional hydrocyclone similar HC11. Through thetechniques of factorial planning, of the experimental results and of the computationalfluidodynamic, was possible analyze the influence of the vortex finder and of the underflowdiameter about the solid-liquid separation. From the previous analysis, was verified that theEuler number and the cut diameter were inversely proportional to the variations of theunderflow diameter. On the other hand, the Euler number was straightly proportional to themodifications of the vortex finder. About the influence of the vortex finder length on the cutdiameter, also it was observed that intermediate values of this geometrical variable providedthe biggest particulate material collection efficiencies. Therefore, the ideal combinationbetween the underflow diameter and the vortex finder length in a filtering hydrocyclone willdepend of the technical-operational interests of each user. Considering the experimentalinterval utilized in this work, if the priority of the user is to know the classification by particlesize, a underflow diameter and a vortex finder length of 5 and 21 mm, respectively, would bethe appropriatest. However, if the objective is only to concentrate the underflow current insolids, would be appropriate a underflow diameter and a vortex finder length of 3 and 12 mm,respectively.
This document abstract is also available in Portuguese.
Bibliographical Information:

Advisor:João Jorge Ribeiro Damasceno; Marcos Antonio de Souza Barrozo; Carlos Henrique Ataide; Luiz Gustavo Martins Vieira; Jader Martins

School:Universidade Federal de Uberlândia

School Location:Brazil

Source Type:Master's Thesis

Keywords:Hidrociclones Separator Hydrocyclones Filtration Computational Fluidodynamic (CFD) Hidrociclone


Date of Publication:03/10/2008

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