Investigation of the simultaneous volumetric 3-component flow field inside a hydrocyclone

Wang, Jiangang; Bai, Zhishan; Yang, Qiang; Fan, Yi; Wang, Hualin

doi:10.1016/j.seppur.2016.02.022

Cited by 58 publications

(11 citation statements)

References 33 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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“…However, the test micro-spheres move near the side wall, which belongs to the boundary layer and quasi-free vortex. The tangential velocity U θ increases from the side wall to the centre of hydrocyclone along the radius [30,31]; therefore, the spheres rotate anticlockwise (ω z <0). In this study, the true rotation speed of micro-spheres is given by the following formula: and has the same structure with the quartz glass hydrocyclone.…”

Section: Experimental Apparatusmentioning

confidence: 99%

High-speed particle rotation for coating oil removal by hydrocyclone

Huang

Zhang

et al. 2017

Separation and Purification Technology

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Hydrocyclone not only realises the centrifugal separation of solids and liquids but also purifies oil-coated particles with their rotational shear flow, resulting in high-speed particle rotation. This study develops a method to detect micro-sphere rotation assisted with microfluidic and high-speed imaging techniques. The method is applied to investigate the intensification mechanism of particle rotation on deoiling oil-coated particles through hydrocyclone. Experimental results show that the highly rotational micro-spheres concentrate in the region approximately 1.5 mm from the side wall and that the strong shear flow near the side wall and particle-wall collision cause the high rotation speed. At experimental conditions, the rotation speed is over 1000 rad/s, which is much larger than that of the isotropic turbulent flow; this speed provides a strong centrifugal force on coating oil. The conical structure of hydrocyclone prevents the axial decrease of tangential velocity, as well as rotation speed, in wall proximity. The magnitude of rotation speed is also significantly affected by inlet flow rate. The deoiling intensification mechanism is attributed to the strong resultant centrifugal force of direction periodically changing that causes by particle rotation and revolution. Experiment on the deoiling of real oil-coated spent catalysts verifies the deoiling intensification of hydrocyclone, that the deoiling efficiency is promoted by at least 12.87% based on stirred hydrothermal tank. This study provides guidance for the design of washing hydrocyclone for oil-coated particles.

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“…Under the action of centrifugal force, the droplets gather near the wall, move toward the underflow exit, and are finally expelled. As the oil moves toward the hydrocyclone's central axis, a centronucleus is formed, flows to the entrance direction, and is expelled from the overflow port [19]. Oil-water is separated through this process.…”

Section: Swirl Centrifugal Field Dehydrationmentioning

confidence: 99%

Dehydration of emulsified lubricating oil by three fields: swirl centrifugal field, pulse electric field and vacuum temperature field

et al. 2016

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Lubricating oil can be easily polluted by water and emulsified, thereby negatively affecting the lubricating property. Meanwhile, wasted lubricating oil, a complex composition, presents high water content and exists with emulsion. A single technological method is difficult to be satisfied for efficient demulsification and dehydration of emulsified lubricating oil. In this paper, it is proposed that the swirl centrifugal field made by hydrocyclone, pulse electric field, and vacuum temperature field are coupled to achieve the oil's dehydration. Based on the theories, it is reasonable to use three fields for oil's demulsification. In the experiment of three-field dehydrating, the demulsification device is divided into two parts, namely, the coupled unit of pulse electric field and hydrocyclone, and the vacuum heating unit. The structure and size of the device were optimized through numerical simulation. With two modes of single field and three-field, the experiments were carried out. Results indicated that the use of three-field was more energy efficient and faster compared with the traditional vacuum heating method only.

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Investigation of the simultaneous volumetric 3-component flow field inside a hydrocyclone

Cited by 58 publications

References 33 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

High-speed particle rotation for coating oil removal by hydrocyclone

Dehydration of emulsified lubricating oil by three fields: swirl centrifugal field, pulse electric field and vacuum temperature field

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