Triple Intercell Bar for Electrometallurgical Processes: A Design to Increase PV Energy Utilization
PV energy prices are declining rapidly. To take advantage of the benefits of those prices and lower the carbon footprint, operational practices must be modified. Undoubtedly, it challenges the electrowinning practice to operate at constant current throughout the day. This work presents a technology that contributes in providing modulation capacity to the electrode current distribution system. This is to raise the day time dc current and lower it at night. The system is a triple intercell bar that operates in current-source mode. The design is a capping board free dogbone type of bar that ensures an operation free of short circuits, hot swapability repairs and improved current balance. This current-source system eliminates the resetting currents circulating in equipotential bars. Twin auxiliary connectors are added to the main connectors providing secure current paths to bypass faulty or impaired contacts. All system conductive elements are positioned over a baseboard offering a large heat sink area to the ventilation of a facility. The system works with lower temperature than a conventional busbar. Of these attributes, the cathode current balance property stands out and is paramount for day/night modulation and the use of photovoltaic energy. A design based on a 3D finite element method model predicting electric and thermal performance under various industrial scenarios is presented. Preliminary results obtained in an electrowinning facility with industrial prototypes are included.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3455649Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 213
 International Renewable Energy Agency, “Renewable Energy Auctions 2016”, 2017.
 M. E. Schlesinger, M. J. King, K. C. Sole, W. G. Davenport, "Extractive Metallurgy of Copper (Fifth Edition)", Elsevier Ltd., UK, 2011.
 M. Free, M. Moats, G. Houlachi, E. Asselin, A. Allanore, J. Yurko, S. Wang, "Electrometallurgy 2012", John Wiley & Sons, USA, 2012.
 E. P. Wiechmann, G. Vidal, A. Pagliero y J. Gonzalez, «Copper Electrowinning using Segmented Intercell Bars for Improved Current Distribution, » Canadian Metallurgical Quarterly, vol. 41, nº 4, pp. 425-432, 2002.
 Aqueveque, P.E.; Wiechmann, E.P.; Herrera, J.; Pino, E.J., "Measurable Variables in Copper Electrowinning and Their Relevance to Predicting Process Performance," in Industry Applications, IEEE Transactions on, vol.51, no.3, pp.2607-2614, May-June 2015
 Doren, N.A.; Hoffman, M.A., “Clarifying the Butler–Volmer equation and related approximations for calculating activation losses in solid oxide fuel cell models”, Journal of Power Sources, vol. 152, pp. 175-181, May 2005.
 I. S. Laitinen, H. K. Virtanen, O. T. Järvinen, T. M. Kumara y J. T. Tanttu, «Finite Element Modeling of an Electrolysis Cell» Canadian Institute of Mining, Metallurgy and Pretroleum, pp. 561-573, 2007.
 E. P. Wiechmann, A. S. Morales, P. Aqueveque, and R. Mayne Nicholls, "Reducing Specific Energy to Shrink the Carbon Footprint in a Copper Electrowinning Facility", IEEE Trans. On. Ind. Appl., vol.47, n°3, pp.1175-1179, 2011.
 Wiechmann, E.P.; Morales, A.S.; Aqueveque, P.; Henríquez, J.A.; Muñoz, L.G., "3D FEM Thermal and Electrical Analysis of Copper Electrowinning Intercell Bars “, IEEE Transactions on Industry Applications, vol.53, no.1, pp.638-644, 2016.
 Wiechmann, E.P.; Morales, A.S.; Aqueveque, P.; Pino, E.; Muñoz, L.G. y Henríquez, J.A., "Intercell Busbar Design for Copper Electrowinning", IEEE Transactions on Industry Applications, vol.52, no.5, pp.4480-4488, 2016.
 E. P. Wiechmann, P. Aqueveque, J. A. Henriquez, L. G. Muñoz y A. Morales, «BMC: A Modulating Bar for Copper Electrowinning Designed for Heavy Duty and High Reliability, » IEEE Transactions on Industry Applications, vol. 50, nº 4, pp. 2375-2381, 2014.