Experimental study of the effect of underflow pipe diameter on separation performance of a novel de-foulant hydrocyclone with continuous underflow and reflux function

Ni, Long; Tian, Jinyi; Zhao, Junming

doi:10.1016/j.seppur.2016.07.047

Cited by 51 publications

(8 citation statements)

References 26 publications

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“…Precise size classification is one of the main means to improve the separation efficiency and sharpness of the beneficiation process. Currently, the hydrocyclone is the main device for particle size classification [6][7][8]. Two products, overflow and underflow, can be obtained via a single separation step in a conventional hydrocyclone.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Jiang¹,

Liu²,

Zhang³

et al. 2019

Minerals

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The “entrainment of coarse particles in overflow” and the “entrainment of fine particlesin underflow” are two inevitable phenomena in the hydrocyclone separation process, which canresult in a wide product size distribution that does not meet the requirement of a preciseclassification. Hence, this study proposed a two-stage (TS) hydrocyclone, and the effects of the inletvelocity on the TS hydrocyclone were investigated using computational fluid dynamics (CFD).More specifically, the influences of the first-stage inlet velocity on the second-stage swirling flowfield and the separation performance were studied. In addition, the particle size distribution of theproduct was analyzed. It was found that the first-stage overflow contained few coarse particlesabove 40 μm and that the second-stage underflow contained few fine particles. The second-stageunderflow was free of particles smaller than 10 μm and almost free of particles smaller than 20 μm.The underflow product contained few fine particles. Moreover, the median particle size of thesecond-stage overflow product was similar to that of the feed. Inspired by this observation, wepropose to recycle the second-stage overflow to the feed for re-classification and to use only thefirst-stage overflow and the second-stage underflow as products. In this way, fine particle productsfree of coarse particle entrainment, and coarse particle products free of fine particle entrainmentcan be obtained, achieving the goal of precise classification.

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Section: Introductionmentioning

confidence: 99%

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Jiang¹,

Liu²,

Zhang³

et al. 2019

Minerals

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“…Figura 1 -Curvas de nível para a eficiência de separação Em contrapartida, a diminuição no diâmetro inferior (Du) leva a um efeito contrário, isto ocorre, pois em diâmetros muito pequenos há o acúmulo de sólidos na saída, o que faz com que um grande número de partículas comece a transbordar, levando a uma diminuição da eficiência de separação, enquanto que um aumento em Du causa um aumento também da eficiência. Esta mesma tendência foi registrada nas simulações feitas por Ghodrat et al (2013) e nos relatado por Ni et al (2016). Percebe-se também que há partes destas curvas de nível que ultrapassam 100% de separação e outras que indicam uma separação negativa.…”

Section: Resultsunclassified

Avaliação Dos Parâmetros Geométricos E Seu Impacto Na Eficiência De Separação De Partículas De Enxofre Em Hidrociclones

Pereira¹,

Maia²,

Igarashi³

et al. 2019

Blucher Chemical Engineering Proceedings

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RESUMO-O sulfeto de hidrogênio pode ser removido de correntes gasosas, como biogás, por meio do processo de absorção oxidativa com soluções aquosas de Fe/EDTA, produzindo o enxofre elementar. O hidrociclone pode ser empregado para realizar a separação do enxofre da solução de Fe/EDTA. Por este motivo, este trabalho objetiva avaliar a influência dos parâmetros geométricos na eficiência de separação de partículas de enxofre de uma solução aquosa. Utilizando simulações de fluidodinâmica computacional (CFD), variou-se em ±50% os valores dos diâmetros superior e inferior, juntamente com a altura da sessão cilíndrica de um hidrociclone da família Bradley dimensionado previamente. Observou-se que há uma forte correspondência linear entre os diâmetros superior e inferior e a eficiência de separação, enquanto que a altura da sessão cilíndrica não influencia significativamente.

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“…Both experimental and theoretical studies by domestic and foreign scholars have generated a series of landmark research results in terms of research methods and content. In terms of the optimization of the structural parameters of the hydrocyclone, the representative studies include experimental studies on the hydrocyclone column height and diameter [14,15], feed inlet type and size [16,17], overflow pipe diameter, length, and shape, overflow pipe thickness [18][19][20], underflow outlet diameter, and shape, ratio relationship between the underflow outlet and overflow outlet [21][22][23]. A series of new hydrocyclone types have been designed, such as the built-in structural hydrocyclone [24,25], underflow outlet filled with flushing water [26], multi-stage series or parallel hydrocyclone [27][28][29], and three-product cyclone [30,31].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flow Field Characteristics and Separation Performance Test of Multi-Product Hydrocyclone

et al. 2019

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A traditional hydrocyclone can only generate two products with different size fractions after one classification, which does not meet the fine classification requirements for narrow size fractions. In order to achieve the fine classification, a multi-product hydrocyclone with double-overflow-pipe structure was designed in this study. In this work, numerical simulation and experimental test methods were used to study the internal flow field characteristics and distribution characteristics of the product size fraction. The simulation results showed that in contrast with the traditional single overflow pipe, there were two turns in the internal axial velocity direction of the hydrocyclone with the double-overflow-pipe structure. Meanwhile, the influence rule of the diameter of the underflow outlet on the flow field characteristics was obtained through numerical simulation. From the test, five products with different size fractions were obtained after one classification and the influence rule of the diameter of the underflow outlet on the size fraction distribution of multi-products was also obtained. This work provides a feasible research idea for obtaining the fine classification of multiple products.

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Experimental study of the effect of underflow pipe diameter on separation performance of a novel de-foulant hydrocyclone with continuous underflow and reflux function

Cited by 51 publications

References 26 publications

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

The Effect of Inlet Velocity on the Separation Performance of a Two-Stage Hydrocyclone

Avaliação Dos Parâmetros Geométricos E Seu Impacto Na Eficiência De Separação De Partículas De Enxofre Em Hidrociclones

Numerical Simulation of Flow Field Characteristics and Separation Performance Test of Multi-Product Hydrocyclone

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