CPFD Simulations on a Chlorination Fluidized Bed Reactor for Aluminum Production: an Optimization Study


  • Zahir Barahmand
  • Chameera Jayarathna
  • Chandana Ratnayake




optimization, fluidized bed reactor (FBR), alumina chlorination, Barracuda, CPFD simulation


Early CPFD simulation studies on designing a fluidized bed reactor for alumina chlorination showed that the model suffers from high particle outflow and dense phase bed channeling. The present study is aimed to optimize the previous alumina chlorination fluidized bed reactor model through modified geometry, parameter modifications, and improved meshing. To optimize the performance of the reactor, complex geometry with an extended top section was combined with a regular cylindrical reactor. Besides, the gas inlet pattern was changed from an ideal uniform distribution to a non-uniform one. Besides, the reactor’s inlet diameter is reduced, and the value for the particle sphericity and voidage has been updated based on experimental observations. The results show that the new reactor with an extended cross-sectional area on top has a significantly lower particle outflow even with the higher inlet superficial gas velocity. The paper discusses the optimization steps and relevant changes in reactor performances in detail.


N. Ahmadpour Samani, C. Jayarathna, and L. A. Tokheim. CPFD simulation of enhanced cement raw meal fluidization through mixing with coarse, inert particles. In proceedings - 61st SIMS Conference on Simulation and Modelling SIMS 2020, Finland, 2020. doi:10.3384/ecp20176399

M. J. Andrews and P. J. O’Rourke. The multiphase particle-in-cell (MP-PIC) method for dense particulate flows. International Journal of Multiphase Flow, 22(2), 379–402. 1996. doi:10.1016/0301-9322(95)00072-0

Z. Barahmand. Design of an Industrial Chlorination Reactor using CPFD Simulations, Master’s Thesis. University of South-Eastern Norway, 2021a.

Z. Barahmand, O. Aghaabbasi, E. K. L. Rustad, J. L. Salcido, C. Jayarathna, and C. Ratnayake. Designing of a medium-scale circulating fluidized bed reactor for chlorination of processed aluminum oxide. In proceedings - 1st SIMS EUROSIM Conference on Modelling and Simulation, Finland, 2021.

Z. Barahmand, C. Jayarathna, and C. Ratnayake. CPFD modeling of the hydrodynamics and reaction kinetics of alumina chlorination in an industrial fluidized bed reactor. In proceedings - 1st SIMS EUROSIM Conference on Modelling and Simulation, Finland, 2021a.

Z. Barahmand, C. Jayarathna, and C. Ratnayake. Sensitivity and uncertainty analysis in a fluidized bed reactor modeling. In proceedings - 1st SIMS EUROSIM Conference on Modelling and Simulation, Finland, 2021b.

Z. Barahmand, C. Jayarathna, and C. Ratnayake. Study of the thermal performance of an industrial alumina chlorination reactor using CPFD simulation. In proceedings - 1st SIMS EUROSIM Conference on Modelling and Simulation, Finland, 2021c.

Z. Barahmand, C. Jayarathna, and C. Ratnayake. The effect of alumina impurities on chlorination in a fluidized bed reactor: A CPFD study. In proceedings - 1st SIMS EUROSIM Conference on Modelling and Simulation, Finland, 2021d.

D. Donaldson and B. Raahauge. Essential Readings in Light Metals, Alumina and Bauxite. John Wiley & Sons, 2013.

S. Ergun. Fluid flow through packed columns. Fluid Flow Through Packed Columns, 48, 89–94. Scopus, 1952.

D. Gidaspow. Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions, 2012.

N. A. Gokcen. Rates of chlorination of aluminous resource, pages 28, U.S. Department of the Interior, Bureau of Mines, 1983.

K. Grjotheim and B. Welch. Impact of Alternative Processes for Aluminium Production on Energy Requirements. In G. Bearne, M. Dupuis, & G. Tarcy (Eds.), Essential Readings in Light Metals: Volume 2 Aluminum Reduction Technology, pages 1049–1055. Springer International Publishing, 2016. doi:10.1007/978-3-319-48156-2_154

A. T. Harris, J. F. Davidson, and R. B. Thorpe. Influence of exit geometry in circulating fluidized-bed risers. AIChE Journal, 49(1), 52–64, 2003. doi:10.1002/aic.690490107

I. B. Haugland, O. Kjos, A. Røyset, P. E. Vullum, T. A. Aarhaug, and M. Halstensen. Alumina Scale Composition and Growth Rate in Distribution Pipes. In C. Chesonis (Ed.), Light Metals 2019 (pp. 697–706). Springer International Publishing, 2019. doi:10.1007/978-3-030-05864-7_86

A. V. Kulkarni, S. V. Badgandi, and J. B. Joshi. Design of ring and spider type spargers for bubble column reactor: Experimental measurements and CFD simulation of flow and weeping. Chemical Engineering Research and Design, 87(12), 1612–1630, 2009. doi:10.1016/j.cherd.2009.06.003

D. Kunii and O. Levenspiel. Fluidization Engineering. Butterworth-Heinemann, 1991.

R. Mabrouk, J. Chaouki, and C. Guy. Exit effect on the hydrodynamics of the internal circulating fluidized bed riser. Powder Technology - POWDER TECHNOL, 182, 406–414, 2008. doi:10.1016/j.powtec.2007.07.008

B. Øye. Could the chloride process replace the Hall-Héroult process in aluminum production?. 2019, March 28.

W. S. Peterson and R. E. Miller. Hall-Héroult Centennial: First Century of Aluminum Process Technology, 2007.

S. Prasad. Studies on the Hall-Héroult aluminum electro winning process. Journal of the Brazilian Chemical Society, 11, 245–251, 2000. doi:10.1590/S0103-50532000000300008

Y. K. Rao and M. K. Soleiman. Alumina chlorination. United States Patent No. US4565674A, 1986. https://patents.google.com/patent/US4565674A/en

D. Sathiyamoorthy and M. Horio. On the influence of aspect ratio and distributor in gas fluidized beds. Chemical Engineering Journal, 93(2), 151–161, 2003. doi:10.1016/S1385-8947(02)00257-7

S. Shaul, E. Rabinovich, and H. Kalman. Generalized flow regime diagram of fluidized beds based on the height to bed diameter ratio. Powder Technology, 228, 264–271, 2012. doi:10.1016/j.powtec.2012.05.029

D. M. Snider. An Incompressible Three-Dimensional Multiphase Particle-in-Cell Model for Dense Particle Flows. Journal of Computational Physics, 170(2), 523–549, 2001. doi:10.1006/jcph.2001.6747

Survey of potential processes for the manufacture of aluminium (ANL/OEPM-79-4). Little (Arthur D.), Inc., Cambridge, MA (USA), 1979. doi:10.2172/5669730

J. Thonstad, J. Aluminium electrolysis: Fundamentals of the Hall-Héroult process, 2001.

V. Verma and J. T. Padding. A novel approach to MP-PIC: Continuum particle model for dense particle flows in fluidized beds. Chemical Engineering Science: X, 6, 100053, 2020. doi:10.1016/j.cesx.2019.100053

C. Wen and Y. Yu. Mechanics of fluidization. The Chemical Engineering Progress Symposium Series, 62, 100–111, 1966.

F. A. William. Combustion Theory. The Benjamin/Cummings Publishing Company, Inc, 1985.

W. Yang and D. Keairns. The effect of an expanded section on slugging, 1980. doi:10.1002/AIC.690260124