Geometric optimization of filtering cylindrical hydrocyclones

Salvador, Fernanda Falqueto; Ascendino, Guilherme Guimarães; Faria, Érica Victor de; Barrozo, Marcos Antônio de Souza; Vieira, Luiz Gustavo Martins

doi:10.1016/j.powtec.2020.12.036

Cited by 15 publications

(2 citation statements)

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“…Hydrocyclones are commonly used in the petrochemical, − mineral processing, , textile, and food industries . The operating principle is based on the centrifugal sedimentation process. , Conventional devices are composed of a conical frustum coupled to a cylindrical section containing a tangential feed and a tube inserted concentrically at the top. − As the suspension enters the cylindrical region tangentially and under pressure, it assumes a downward spiral motion, creating an external vortex until it reaches the lower part of the cone frustum. Denser and larger particles are more likely to remain in the external vortex and be collected in the underflow orifice.…”

Section: Introductionmentioning

confidence: 99%

“…It is acknowledged that the transport in a conduit adjacent to a porous medium is drastically influenced by the porous walls . Previous studies with diluted and Newtonian suspensions demonstrated that the filtering hydrocyclone has operational advantages over conventional hydrocyclones of the same geometry, , including higher processing capacity and overall efficiency, which can be attributed to changes in the fluid dynamics behavior. , It is known that the dispersion of Newtonian fluid in a conduit with porous walls is different for non-Newtonian fluid . To date, no studies have been carried out on filtering hydrocyclones operating with non-Newtonian fluids.…”

Section: Introductionmentioning

confidence: 99%

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Study on Filtering Hydrocyclones Operating with Concentrated Non-Newtonian Suspensions

Morimoto,

Gonçalves,

Barrozo

et al. 2023

Ind. Eng. Chem. Res.

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Hydrocyclones are devices used to separate a discrete phase (solid or liquid) from a continuous liquid phase. Although this partition process is simple and versatile, there are limitations when separating concentrated suspensions with high viscosity. By replacing the cylinder or cone walls of hydrocyclones by a permeable wall, our research group developed the so-called filtering hydrocyclones. Although previous studies have shown that filtering hydrocyclones have a better performance than conventional devices of the same geometry, they were performed with diluted Newtonian suspensions. Thus, the aim of the present work is to evaluate the performance of a filtering and a conventional hydrocyclone of the same geometry operating with concentrate suspensions with pseudoplastic rheological behavior. The geometric relationship of these hydrocyclones was obtained in a previous optimization study that aimed at maximizing overall efficiency in aqueous diluted suspensions; this high-efficiency device is known as MOEH. When operating a pseudoplastic fluid with a behavior index equal to 0.6536, there was a 48% decrease in the efficiency of the MOEH hydrocyclone. The MOEH experiments performed with a pseudoplastic suspension containing 9.5 wt % of solids and 0.6 wt % of carboxymethyl cellulose achieved an Euler number of 1108, a split ratio of 44%, and an overall efficiency of 47%. However, the average results demonstrated that the operation with the newly designed filtering hydrocyclone, called MOEH-CoF, led to an Euler number about 10% lower and an overall efficiency about 5% higher than that obtained with the conventional device. The findings of this study can lead to a better understanding of solid–liquid separation in the petrochemical, mineral, and food industries, which generally works with concentrated non-Newtonian fluids.

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