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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Aluminum Reduction Technology Joint Session with REWAS: Decarbonizing the Metals Industry
Presentation Title Stabilizing Electrolysis Cells with Oscillating Currents: Amplitude, Frequency and Current Efficiency
Author(s) Ibrahim Mohammad, Marc Dupuis, Paul D. Funkenbusch, Douglas H. Kelley
On-Site Speaker (Planned) Ibrahim Mohammad
Abstract Scope The metal pad instability (MPI) imposes a minimum electrolyte layer thickness for stable operation of aluminium electrolysis cells, which limits cells' energy efficiency. The MPI is a magnetohydrodynamic process that depends on a coupled resonance between hydrodynamic gravity wave modes, driven by the cell's electrolytic current, appearing as a circulating traveling wave that grows exponentially. Adding an oscillating current component, whose frequency is close to a low-frequency gravity mode instead excites standing waves that can prevent the MPI. Here, we show that the a minimum oscillation amplitude is required for preventing the MPI, but excessive amplitude causes a wave that shorts the cell. Proper oscillation frequency choice also impacts the stabilization effect. We also discuss the impact of exciting standing waves on the current efficiency of the cell. Applying oscillating currents could significantly increase the energy efficiency of Al cells without the need for expensive reconstruction, paving the way towards more efficient, low carbon Al production.
Proceedings Inclusion? Planned: Light Metals
Keywords Aluminum, Modeling and Simulation, Sustainability


Building of a Superconductor Busbar at 200 kA for an Aluminium Plant
Bus Bars FSW Repair during Full Operation of Alumina Electrolysis
Cooling of Pot Gas Enabling Carbon Footprint Reductions
Research on Low Temperature Aluminium Electrolysis Charging Recovery System of Renewable Energy Cycle Power Generation System
Stabilizing Electrolysis Cells with Oscillating Currents: Amplitude, Frequency and Current Efficiency
The Contribution and Economics of Demand Side Response towards Decarbonizing the Aluminium Industry

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