Numerical Investigation of the Vortex Breaker for A Dynamic Separator using Computational Fluid Dynamics

Guizani, R.; Mhiri, H.; Bournot, P.

doi:10.47176/jafm.16.06.1553

Numerical Investigation of the Vortex Breaker for A Dynamic Separator using Computational Fluid Dynamics

Document Type : Regular Article

Authors

¹ LTTPI, Laboratory of Thermic and Thermodynamic Industrial Processes, National Engineering School of Monastir (ENIM), 5019 Monastir, Tunisia

² Aix-Marseille University, CNRS, IUSTI, 13 013 Marseille, France

10.47176/jafm.16.06.1553

Abstract

The separation efficiency and pressure drop of the dynamic separator of cement particles can be affected by many factors, like structural type, geometric parameters, and operating characteristics. In this paper, CFD modeling is applied to investigate the fluid flow behavior and the efficiency of the industrial dynamic separator with different heights of the inner cone called the vortex breaker. Simulations are based on the RSM and the DPM models. A CFD comparison of the original design and new designs has been performed. The simulation results showed that the fluid flow inside the industrial air separator is greatly dependent on the height of the vortex breaker. Interesting phenomena were observed by the numerical simulations and the results revealed that an increase in the height of the vortex breaker up to three-quarters of the magnitude of the fine powder outlet duct can improve the performances of particle separation not only by reducing 29% the cut size, and by 40% the bypassing of fine particles but also by increasing 30% the separation sharpness while keeping the pressure drop substantially unchanged.

Keywords

Main Subjects

Computational Fluid Dynamics

References

Brar, L. S. and J. J. Derksen (2020). Revealing the details of vortex core precession in cyclones by means of large-eddy simulation. Chemical Engineering Research and Design 159, 339-352.##

Eswaraiah, C., S. I. Angadi and B. K. Mishra (2012). Mechanism of particle separation and analysis of fish-hook phenomenon in a circulating air classifier. Powder Technology 218, 57-63.##

Ghodrat, M., S. B. Kuang, A. B. Yu, A. Vince, G. D. Barnett and P. J. Barnett (2014). Numerical analysis of hydrocyclones with different conical section designs. Minerals Engineering 62, 74-84.##

Guizani, R., H. Mhiri and P. Bournot (2017). Effects of the geometry of fine powder outlet on pressure drop and separation performances for dynamic separators. Powder Technology 314, 599-607.##

Guizani, R., I. Mokni, H. Mhiri and P. Bournot (2014). CFD modeling and analysis of the fish-hook effect on the rotor separator's efficiency. Powder Technology 264, 149-157.##

Guo, L., J. Liu, S. Liu and J. Wang (2007). Velocity measurements and flow field characteristic analyses in a turbo air classifier. Powder Technology 178.1, 10-16.##

Huang, Q., J. Liu and Y. Yu (2012). Turbo air classifier guide vane improvement and inner flow field numerical simulation. Powder Technology 226, 10-15.##

Klumpar, I. V., F. N. Currier and T. A. Ring (1986). Air classifiers. Chemical Engineering 3, 77–92.##

Jiang, L., P. Liu, X. Yang, Y. Zhang and H. Wang (2020). Designing W-shaped apex for improving the separation efficiency of a full-column hydrocyclone. Separation Science and Technology 55(9), 1724-1740.##

Jiang, L., P. Liu, X. Yang, Y. Zhang, H. Wang and C. Xu (2019). Numerical analysis of flow field and separation characteristics in hydrocyclones with adjustable apex. Powder Technology 356, 941-956.##

Li, W., Z. Huang, G. Li and C. Ye (2022). Effects of different cylinder roof structures on the vortex of cyclone separators. Separation and Purification Technology 296, 121370.##

Liu, G. F., Y. Yuan and J. X. Liu (2011). Effect of volute with horizontal plates on flow fields in turbo air classifiers. Chemical Engineering 39(7), 69-73.##

Liu, R., J. Liu and Y. Yu (2015). Effects of axial inclined guide vanes on a turbo air classifier. Powder Technology 280, 1-9.##

Misiulia, D., S. Antonyuk, A. G. Andersson and T. S. Lundström (2020). High-efficiency industrial cyclone separator A CFD study. Powder Technology 364, 943-953.##

Mokni, I., H. Dhaouadi, P. Bournot and H. Mhiri (2015) Numerical investigation of the effect of the cylindrical height on separation performances of uniflow hydrocyclone. Chemical Engineering Science 122, 500-513.##

Rajmistry, S., S. Ganguli, P. Chandra and P. K. Chatterjee (2017). Numerical Analysis of Gas-Solid Behavior in a Cyclone Separator for Circulating Fluidized Bed System. Journal of Applied Fluid Mechanics 10, 1167-1176.##

Sharf, A. M., H. A. Jawan and F. A. Almabsout (2014). The influence of the tangential velocity of inner rotating wall on axial velocity profile of flow through vertical annular pipe with rotating inner surface. In EPJ Web of Conferences, EDP Sciences.##

Sun, Z., C. Liu, G. Yang and L. Chen (2022). Orthogonal vortices characteristic, performance evaluation and classification mechanism of a horizontal classifier with three rotor cages. Powder Technology 404, 117438.##

Sun, Z., G. Sun, J. Liu and X. Yang (2017). CFD simulation and optimization of the flow field in horizontal turbo air classifiers. Advanced Powder Technology 28 (6), 1474-1485.##

Zhang, L., Y. Chen, B. Zhao, M. Dang and Y. Yao (2022a). Numerical simulation on structure optimization of escape-pipe of cyclone separator with downward outlet. Powder Technology 117588.##

Zhang, R., J. Yang, S. Han, X. Hao and G. Guan (2022b). Improving advantages and reducing risks in increasing cyclone height via an apex cone to grasp vortex end. Chinese Journal of Chemical Engineering.##

Zhang, Y., G. Yu, R. Jin, X. Chen, K. Dong, Y. Jiang and B. Wang (2020). Investigation into water vapor and flue gas temperatures on the separation capability of a novel cyclone separator. Powder Technology 361, 171-178.##