Study on oil–water two-phase flow characteristics of the hydrocyclone under periodic excitation

Li, Sen; Li, Ruoning; Nicolleau, F.; Wang, Zunce; Yan, Yuejuan; Xu, Yuanyuan; Chen, Xing

doi:10.1016/j.cherd.2020.04.027

Cited by 21 publications

(4 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The parameter characteristics are shown in Table 2. The separation process of two-phase vapor in the cyclone presented an internal and external two-layer swirl; especially, the turbulence degree of the internal swirl was higher, and the anisotropy was more obvious [27,28]. The Reynolds stress model (RSM) considers the characteristics of rapid change of vortex, rotation, and tension in engineering turbulence calculation, and can solve the problem of anisotropy of the internal and external vortex [29].…”

Section: Governing Equationsmentioning

confidence: 99%

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Zhao

Sun²,

Wang³

et al. 2022

Energies

View full text Add to dashboard Cite

The density of tar vapor and water vapor produced by coal pyrolysis is different. Different centrifugal forces will be generated when they flow through the hydrocyclone. The water vapor and tar vapor are divided into inner and outer layers. According to this phenomenon, the moisture in the tar can be removed. In this paper, a Eulerian gas–liquid two-phase flow model is established by numerical simulation to study the effect of inlet velocity on the separation effect of a designed hydrocyclone (split ratio 0.2). The results show that the inlet velocity and moisture content have an influence on the volume distribution characteristics, tangential velocity, axial velocity, pressure drop distribution, and separation efficiency of tar vapor and water vapor in the hydrocyclone. When the inlet velocity increases from 2.0 to 12.0 m/s, the central swirl intensity increases, and the negative pressure sweep range at the overflow outlet increases. The axial velocity increased from 2.8 to 14.9 m/s, tar vapor content at the overflow outlet decreased from 74% to 37%, and at the underflow outlet increased from 89% to 92%. When the moisture content is lower than 10%, the hydrocyclone with the split ratio of 0.20 is no longer suitable for the separation of oil–water two-phase vapor. However, when the water content is higher than 20%, the purity of tar vapor at the underflow outlet can reach 92%, and the overflow outlet needs multistage separation to realize tar purification.

show abstract

Section: Governing Equationsmentioning

confidence: 99%

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Zhao

Sun²,

Wang³

et al. 2022

Energies

View full text Add to dashboard Cite

show abstract

“…With its excellent classification performance, hydrocyclone is widely used in mineral processing, the chemical industry, petroleum, etc. [2][3][4][5]. However, the mismatch phenomenon of coarse particles entrained in the overflow product and fine particles entrained in the bottom flow product has always existed in the hydrocyclone classification process [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Vortex-Finder on Classification Performance for Double Vortex-Finder Hydrocyclone

Zhang

Jiang

et al. 2022

Separations

View full text Add to dashboard Cite

The double vortex-finder hydrocyclone formed by a coaxial insertion of an internal vortex-finder with a smaller diameter inside the conventional single vortex-finder used to obtain two kinds of products from the internal and external overflows in one classification has attracted wide attention. To further improve the classification performance of the hydrocyclone, the effects of the internal vortex-finder diameter and length on the classification performance were studied by numerical simulation and response surface modeling with the behavior of fluid and particle motion in the double vortex-finder hydrocyclone as the research object. The results showed that the split ratio and pressure drop of internal and external overflow increased with the diameter of the internal vortex-finder. The classification performance was optimal when the diameter ratio of internal and external overflow was 0.88, the yield of −20 μm particles was more than 80.0%, and the highest was 95.0%. Increasing the internal vortex-finder length could reduce the coarse particle content and improve the classification accuracy of the internal overflow product. When the length of the internal vortex-finder is larger than 80 mm, the +30 μm yield was lower than 20.0%, and the maximum k value was 16.3%; the k is the significant factor used to characterize the effectiveness of −20μm particle collection. The response surface modeling revealed that the internal vortex-finder diameter was the most important factor affecting the distribution rate of internal overflow. This paper is expected to advance the development of the classification industry.

show abstract

“…According to He et al [8] engineering wise, hydrocyclones are frequently employed for separating solid-liquid, gas-liquid and liquid-liquid mixtures. For the liquid-liquid case, both dewatering and deoiling methods have been mostly utlized in the oil industry [9]. Hydrocyclones have emerged as an economical and effective alternative for produced water deoiling and other applications over the conventional methods [4].…”

Section: Introductionmentioning

confidence: 99%

Development and Performance of Hydrocyclone Separator for Biodiesel Production

Fatounde

Oni²,

Idowu³

2022

JERR

View full text Add to dashboard Cite

Hydrocyclone is an equipment that uses a cyclone or tangential injection flow process with centrifugal forces to separate liquids of different densities. The denser liquid move downwards in a spiral path into an underflow chamber, while clean liquid which is less dense move upwards to the center of the spiral, towards the top outlet. Colman and Thew’s hydrocyclone geometry analysis approached was used in the design and the assumed inlet chamber diameter (D) used for this design was 150 mm and a reducing section length of 1500 mm at a reducing angle of 20°. The capacity of the designed hydrocyclone system in volume is 5.5 liters. The developed machine was tested with 15 liters of palm kernel oil (PKO) as raw material using two different pressures gauge (70 and 80 kPa) and also effect acid concentration (sulphuric acid) at 3 different experimental runs. After the experiments, it was deduced that at constant temperature level, as the pressure rate increases, there is a corresponding increase in the discharge rate at the underflow and overflow outlets where 2.04 minutes and 1.67 minutes were used to separate biodiesel and glycerin under 70 and 80 kPa respectively. Also, it was deduced experimentally that PKO with sulphuric acid gives a higher yield of biodiesel of 47.74% while the one without has 38.49% yield under same experimental and operational conditions.

show abstract

Study on oil–water two-phase flow characteristics of the hydrocyclone under periodic excitation

Cited by 21 publications

References 17 publications

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Effect of Internal Vortex-Finder on Classification Performance for Double Vortex-Finder Hydrocyclone

Development and Performance of Hydrocyclone Separator for Biodiesel Production

Contact Info

Product

Resources

About