Performance of hydrocyclones with different geometries

Vieira, Luiz Gustavo Martins; Silvério, Beatriz Cristina; Damasceno, João Jorge Ribeiro; Barrozo, M. A. S.

doi:10.1002/cjce.20461

Cited by 72 publications

(45 citation statements)

References 19 publications

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“…Some authors have already evaluated the influence of the inlet diameter (Di) on the performance of hydrocyclone [23][24][25]. However, the influence of this geometric variable on the performance of filtering hydrocyclones has not yet been reported.…”

Section: Figurementioning

confidence: 97%

Effect of Inlet Diameter on the Performance of a Filtering Hydrocyclone Separator

2016

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Hydrocyclones are separators used in several industry fields, such as mining, food and petrochemical. Our research group designed a new hydrocyclone, in which a conical filtering wall replaces the conical section, producing another liquid stream leaving the equipment, besides underflow and overflow streams. In the present work, the influence of inlet diameter (Di) of a filtering hydrocyclone was analyzed by an experimental and CFD study. Data from conventional hydrocyclones of the same configurations were also obtained. Under the same operating conditions and geometry, the filtering hydrocyclone presented a better performance than the conventional device. Under the experimental conditions evaluated, an increase in inlet diameter by a factor of 2.2 reduces the Euler number by 84%. Keywords: Hydrocyclones, solid-liquid separation, unit operations IntroductionHydrocyclones are very simple devices, that consist of a conical section, open at its apex (underflow), joined to a cylindrical section, which has a tangential feed inlet [1]. The top of the cylindrical section is closed with a plate with an axially mounted overflow pipe. Despite the apparent simplicity, hydrocyclones are very efficient to promote solid-liquid and liquid-liquid separations. These devices convert pressure generated by a centrifugal pump into centrifugal force, causing suspended solids in the mud to be separated from the fluid. This separation is actually accelerated settling due to the increased gravitational force cause by the centrifugal action inside the cone. The action inside the hydrocyclone can multiply gravitational force by as much as 200 times [2].Application of hydrocyclone for particles separation is widespread due to advantages such as low cost, simple structure, large capacity and low volume [3]. Despite its simplicity, the flow behavior in a hydrocyclone is quite complex. The internal flow in these devices is totally turbulent and presents high vorticity preservation, vortex breakdown, flow inversion, air core etc. However, advances in computational technology, over recent years, have led to models based on fundamental fluid flow to predict the performance of the equipment. Computational Fluid Dynamics (CFD) is an important www.cet-journal.com Page 2 Chemical Engineering & TechnologyThis article is protected by copyright. All rights reserved.technique to study the fluid dynamics of many physical systems and it has been used widely in several engineering applications [4,5], including modelling flow in hydrocyclones [6][7][8][9][10][11][12][13][14][15].The literature presents some classic designs of hydrocyclones (also called families), in which the main design variable is the cylindrical diameter (Dc), and the other geometric dimensions are related to this one. The use of a certain family of hydrocyclones is generally restricted to the demand for a specific application [16].For improving the performance of hydrocyclones, many modifications in the conventional configurations of this device have been proposed in the literatur...

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Section: Figurementioning

confidence: 97%

Effect of Inlet Diameter on the Performance of a Filtering Hydrocyclone Separator

2016

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“…A series of works on the simulation of hydrocyclones using the incompressible Navier-Stokes equations, complemented by an adequate turbulence model, have proven to be suitable for modeling the flow in hydrocyclones (Cullivan et al 2004). The application of developed CFD techniques will alleviate some of the difficulties and problems when using models with empirical correlations (Vieira et al 2011). Investigation of numerical methods for simulating a hydrocyclone was performed by Xu et al (2009).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of hydroabrasion in a hydrocyclone

Azimian

Bart

2016

Pet. Sci.

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The velocity profiles and separation efficiency curves of a hydrocyclone were predicted by an Euler-Euler approach using a computational fluid dynamics tool ANSYS-CFX 14.5. The Euler-Euler approach is capable of considering the particle-particle interactions and is appropriate for highly laden liquid-solid mixtures. Predicted results were compared and validated with experimental results and showed a considerably good agreement. An increase in the particle cut size with increasing solid concentration of the inlet mixture flow was observed and discussed. In addition to this, the erosion on hydrocyclone walls constructed from stainless steel 410, eroded by sand particles (mainly SiO 2 ), was predicted with the Euler-Lagrange approach. In this approach, the abrasive solid particles were traced in a Lagrangian reference frame as discrete particles. The increases in the input flow velocity, solid concentration, and the particle size have increased the erosion at the upper part of the cylindrical body of the hydrocyclone, where the tangential inlet flow enters the hydrocyclone. The erosion density in the area between the cylindrical to conical body area, in comparison to other parts of the hydrocyclone, also increased considerably. Moreover, it was observed that an increase in the particle shape factor from 0.1 to 1.0 leads to a decrease of almost 70 % in the average erosion density of the hydrocyclone wall surfaces.

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“…Segundo Vieira et al (2007), o processo de separação do hidrociclone filtrante é similar ao do equipamento convencional. Sendo que no novo equipamento existe uma corrente adicional de fluido oriunda da região cônica porosa do separador além das correntes de alimentação, overflow e underflow.…”

Section: Introductionunclassified

Estudo Do Efeito Da Permeabilidade Na Performance Do Hidrociclone Cilíndrico Filtrante

Salvador¹,

Kyriakidis²,

Gonçalves³

et al. 2015

Anais Do XXXVII Congresso Brasileiro De Sistemas Particulados

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RESUMOOs hidrociclones são equipamentos utilizados em diversos setores industriais e se baseiam no princípio da sedimentação centrífuga. Podem ser empregados em processos de classificação de partículas de acordo com tamanho/densidade, espessamento, deslamagem, retirada de gotas de óleo do líquido de interesse. Propostas para a modificação desse equipamento visando alavancar seu desempenho sempre estiveram presentes na literatura. Dessa maneira, o intuito deste trabalho foi dar continuidade aos estudos realizados pelo grupo de pesquisa da Faculdade de Engenharia Química da Universidade Federal de Uberlândia ao incorporar uma parede cilíndrica permeável, dando origem ao hidrociclone cilíndrico filtrante. Objetivou-se avaliar como a permeabilidade da matriz porosa cilíndrica influenciava o desempenho do hidrociclone HCiF. Os experimentos foram realizados utilizando três permeabilidades distintas para a parede porosa. Os resultados mostraram que menores permeabilidades fornecem equipamentos com maior capacidade de processamento. O consumo energético foi, em média, 24% menor no HCiF de menor permeabilidade se comparado ao de maior permeabilidade. A razão de líquido e a eficiência total de separação sofreram pequenas modificações devido ao uso de diferentes permeabilidades para a parede filtrante.

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Performance of hydrocyclones with different geometries

Cited by 72 publications

References 19 publications

Effect of Inlet Diameter on the Performance of a Filtering Hydrocyclone Separator

Effect of Inlet Diameter on the Performance of a Filtering Hydrocyclone Separator

Numerical analysis of hydroabrasion in a hydrocyclone

Estudo Do Efeito Da Permeabilidade Na Performance Do Hidrociclone Cilíndrico Filtrante

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