Flow behavior and performance analysis of Annular Centrifugal Contactor for liquid–liquid separation: A numerical study
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Liquid–liquid separation is a process of separating two liquids based on their relative solubility; however, separating two liquids with a slight density difference is difficult because of interfacial forces. A newly designed annular centrifugal contactor (ACC) with a funnel–type weir zone was investigated numerically to analyze the flow fields and separation performance of two liquids with slight density differences, such as palm oil and water. Ansys CFX was used to simulate unsteady, turbulent, multiphase flows in the ACC. The simulation was performed using the Eulerian–Eulerian method, in which a homogeneous k–ɛ turbulence model with a scalable wall function is used. The sliding mesh method was adopted to solve the rotational effect of the stator rotor. A detailed para-metric analysis of mixing and separation based on the liquid density difference, angular velocity, and inlet velocity of the mixture variations was performed. The oil quality and separation efficiency were calculated at the oil outlet to analyze the performance of the ACC rotor. The results show that oil quality increases with increasing angular and inlet velocities but decreases with an increasing liquid density difference. Moreover, the oil separation efficiency decreases with increasing angular and inlet velocities but increases with an increasing liquid density difference. Maximum oil quality and separation efficiencies of approximately 99% and 79%, respec-tively, were obtained at the oil outlet. Finally, it can be concluded that the two liquids with a slight density difference can be adequately separated using the newly designed ACC.
Abstract
Liquid–liquid separation is a process of separating two liquids based on their relative solubility; however, separating two liquids with a slight density difference is difficult because of interfacial forces. A newly designed annular centrifugal contactor (ACC) with a funnel–type weir zone was investigated numerically to analyze the flow fields and separation performance of two liquids with slight density differences, such as palm oil and water. Ansys CFX was used to simulate unsteady, turbulent, multiphase flows in the ACC. The simulation was performed using the Eulerian–Eulerian method, in which a homogeneous k–ɛ turbulence model with a scalable wall function is used. The sliding mesh method was adopted to solve the rotational effect of the stator rotor. A detailed para-metric analysis of mixing and separation based on the liquid density difference, angular velocity, and inlet velocity of the mixture variations was performed. The oil quality and separation efficiency were calculated at the oil outlet to analyze the performance of the ACC rotor. The results show that oil quality increases with increasing angular and inlet velocities but decreases with an increasing liquid density difference. Moreover, the oil separation efficiency decreases with increasing angular and inlet velocities but increases with an increasing liquid density difference. Maximum oil quality and separation efficiencies of approximately 99% and 79%, respec-tively, were obtained at the oil outlet. Finally, it can be concluded that the two liquids with a slight density difference can be adequately separated using the newly designed ACC.
참고문헌 (26)
- M. Hao, "Removal of oil from electric desalting wastewater using centrifugal contactors", Journal of Petroleum Science and Engineering, 111, pp.37~41 (2013)
- Q. Xia, "Measurement and correlation for solubility of dimethyl-2, 6-naphthalene dicarboxylate in organic solvents", Chinese Journal of Chemical Engineering, 15(2), pp.215~220 (2007)
- W. Duan, "Development and performance of a new annular centrifugal contactor for semi‐industrial scale", Separation Science and Technology, 40(9), pp.1871~1883 (2005)
- M. Ilmi, "Process intensification of catalytic liquid-liquid solid processes : Continuous biodiesel production using an immobilized lipase in a centrifugal contactor separator", Chemical Engineering Journal, 321, pp.76~85 (2017)
- H. Jiang, "Separation and recycle of phenol from wastewater by liquid–liquid extraction", Separation Science and Technology, 38(11), pp.2579~2596 (2003)
- X. Jing, "A review of application of annular centrifugal contactors in aspects of mass transfer and operational security", Hydrometallurgy, 177, pp.41~48 (2018)
- J. D. Law, "Liquid-liquid extraction equipment" (2008), Idaho National Laboratory
- Q. Luo, "The study of fluid dynamics in countercurrent multi-stage micro-extraction system", Energy Procedia, 39, pp.275~282 (2013)
- H. Ghaya, "CFD study of the effect of geometrical shape of separation blades on the rotor performance of an Annular Centrifugal Extractor(ACE)", Journal of Applied Fluid Mechanics, 12(4), pp.1189~1202 (2019)
- G. J. Bernstein, "A high-capacity annular centrifugal contactor", Nuclear Technology, 20(3), pp.200~202 (1973)
- J. Zhou, "Application of annular centrifugal contactors in the extraction flowsheet for producing high purity yttrium", Hydrometallurgy, 85(2-4), pp.154~162 (2007)
- W. Duan, "Separation of Nd3+ and Fe3+by non-equilibrium solvent extraction using an annular centrifugal contactor", Separation and Purification Technology, 146, pp.108~113 (2015)
- S. Kumar, "Extraction of uranium from simulated highly active feed in a micromixer-settler with 30%TBP and 36% TiAP solvents", Journal of Radioanalytical and Nuclear Chemistry, 311(3), pp.2111~2116 (2017)
- X. Jing, "Rapid selective extraction of V(V)from leaching solution using annular centrifugal contactors and stripping for NH4VO3", Separation and Purification Technology, 187, pp.407~414 (2017)
- K. Tang, "Process optimization of continuous liquid–liquid extraction in centrifugal contactor separators for separation of oxybutynin enantiomers", Separation and Purification Technology, 150, pp.170~178 (2015)
- X. Jing, "Separation of V(V)and Cr(VI)in leaching solution using annular centrifugal contactors", Chemical Engineering Journal, 315, pp.373~381 (2017)
- D. H. Meikrantz, "A new annular centrifugal contactor for pharmaceutical processes", Chemical Engineering Communications, 189(12), pp.1629~1639 (2002)
- Y. Xu, "PIV experimental study on the flow field in the rotor zone of an annular centrifugal contactor", Chemical Engineering Research and Design, 94, pp.691~701 (2015)
- A. Eggert, "Computer tomographic detection of the liquid–liquid mixing and separation within the Annular Centrifugal Contactor", Extractor, 2019, pp.142, 143~153
- A. Eggert, "Liquid–liquid centrifugal separation—New equipment for optical(photographic)evaluation at laboratory scale", Chemical Engineering Research and Design, 127, pp.170~179 (2017)
- K. E. Wardle, "CFD simulation of the separation zone of an annular centrifugal contactor", Separation Science and Technology, 44(3), pp.517~542 (2009)
- N. T. Padial‐Collins, "Centrifugal Contactors : Separation of an aqueous and an organic stream in the rotor zone(LA‐UR‐05‐7800)", Separation Science and Technology, 41(6), pp.1001~1023 (2006)
- Hyunjong Kim, "Numerical estimation on applying air-trapping mechanism to suppress sloshing loads in a prismatic tank", Journal of Mechanical Science and Technology, 34(7), pp.2895~2902 (2020), 대한기계학회[DOI]
- S. Li, "CFD simulation of gas–liquid–liquid three-phase flow in an annular centrifugal contactor", Industrial & Engineering Chemistry Research, 51(34), pp.11245~11253 (2012)
- C. Rosales, "Computer simulation of water-oil separation in cylindrical and square hydrocyclones", Proceedings of the 2011 international conference on modeling, simulation & visualization methods, pp.121~124 (2011)
- H. Kim, "Numerical study on sloshing charateristics with Reynolds number variation in a rectangular tank", Computation, 6(4), pp.53~ (2018)