Abstract
Current distribution is critical for good operation of Submerged Arc Furnaces for silicon production. Control systems do not offer this information as it is not directly measureable, but metallurgists operate furnaces based on experienced interpretation of available data. A number of recent dig-outs of industrial furnaces has expanded available information on location dependent charge properties, thus enabling numerical models with reasonably realistic domain configurations. This has the potential to enhance understanding of critical process parameters allowing more accurate furnace control. This work presents computations of electric current distributions inside an industrial submerged arc furnace for silicon production. A 3D model has been developed in ANSYS Fluent using electric potential solver. Electrode, arc, crater, crater wall, and side arc that connects electrode and crater wall are considered for each phase. In this paper the current distributions in electrode, arc and crater wall for different configurations and thickness of the crater walls are presented. The side-arcs are modelled as either a single concentrated arc, or a smeared out arc, in order to capture extreme cases. The main result is that side arc configuration is more important for the fraction of the current passing through the crater wall than the carbide thickness. The current fraction bypassing the main arc through the charge is highly influenced by the ease of contact between electrode and conducting charge material. Qualitatively, the results are in a good agreement with previously published results from literature.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Schei A, Tuset JK, Tveit H (1998) Production of high silicon alloys. Tapir Forlag, Trondheim
Sævarsdottir GA, Bakken JA, Sevastyanenko VG, Liping G (2011) High power ac arcs in metallurgical furnaces. High Temp Mat Process 15(3)
Saevarsdottir GA, Bakken JA (2010) Current distribution in submerged arc furnaces for silicon metal/ferrosilicon production, In: proceedings INFACON12
Tranell G, Andersson M, Ringdalen E, Ostrovski O, Stenmo JJ (2010) Reaction zones in a FeSi75 furnace—results from an industrial excavation. INFACON XII, pp 709–715
Myrhaug EH (2003) Non-fossil reduction materials in the silicon process-properties and behavior. Ph.D. thesis, NTNU
Tangstad M, Ksiazek M, Andersen JE (2014) Zones and materials in the Si furnace. In: proceedings of the silicon for the chemical and solar industry XII, Trondheim, Norway, 24–27 June 2014
Krokstad M (2014) Electrical resistivity of industrial SiC crusts, MSc-thesis NTNU
Vangskåsen J (2012) Metal-producing mechanisms in the carbothermic silicon process. M.Sc. thesis, NTNU
Mølnås H (2010) Investigation of SiO condensate formation in the silicon process, Project report in TMT 4500, NTNU, Norway
Nell J, Joubert C (2013) Phase chemistry of digout samples from a ferrosilicon furnace, Infacon proceedings Kazakhstan
Dhainaut M (2004) Simulation of the electric field in a submerged arc furnace. INFACON X, pp 605–613
Bezuidenhout JJ, Eksteen JJ, Bardshaw SM (2009) Computational fluid dynamic modelling of an electric furnace used in the smelting of PGM containing concentrates. Min Eng 22:995–1006. https://doi.org/10.1016/j.mineng.2009.03.009
Darmana D, Olsen JE, Tang K, Ringldalen E (2012) Modelling concept for submerged arc furnaces. Paper presented at the ninth international conference on CFD in the minerals and process industries CSIRO, Melbourne, Australia, 10–12 Dec 2012
Wang Z, Fu Y, Wang N, Feng L (2014) 3D numerical simulation of electrical arc furnaces for the MgO production. J Mat Process Tecnol 214:2284–2291. http://dx.doi.org/10.1016/j.jmatprotec.2014.04.033
FLUENT, ver. 17.0 (2017) ANSYS Inc., Southpointe, 275 Technology Drive, Canonsburg, PA 15317
Sævarsdottir GA (2002) High current ac arcs in silicon and ferrosilicon furnaces. Ph.D. thesis, NTNU
ICEM-CFD, ver. 17.0 (2017) ANSYS Inc., Southpointe, 275 Technology Drive, Canonsburg, PA 15317
Sasaki H, Ikari A, Terashima K, Kimura S (1995) Temperature dependence of the electrical resistivity of molten silicon. Jpn J Appl Phys. https://doi.org/10.1143/JJAP.34.3426
Acknowledgements
The Icelandic Technology development fund is greatly acknowledged for their funding of this work.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 The Minerals, Metals & Materials Society
About this paper
Cite this paper
Tesfahunegn, Y.A., Magnusson, T., Tangstad, M., Saevarsdottir, G. (2018). Effect of Carbide Configuration on the Current Distribution in Submerged Arc Furnaces for Silicon Production—A Modelling Approach. In: Nastac, L., Pericleous, K., Sabau, A., Zhang, L., Thomas, B. (eds) CFD Modeling and Simulation in Materials Processing 2018. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72059-3_17
Download citation
DOI: https://doi.org/10.1007/978-3-319-72059-3_17
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-72058-6
Online ISBN: 978-3-319-72059-3
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)