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Metallurgical and Materials Transactions B

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04.01.2023 | Original Research Article

Studies on Power Modulation of Aluminum Smelting Cells Based on a Discretized Mass and Thermal Dynamic Model

verfasst von: Choon-Jie Wong, Jie Bao, Maria Skyllas-Kazacos, Barry Welch, Mohamed Mahmoud, Alexander Arkhipov, Nadia Ahli

Erschienen in: Metallurgical and Materials Transactions B | Ausgabe 2/2023

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Abstract

With increasing penetration of intermittent renewables, flexible operation of the aluminum smelting process under variable power supply will become critical for smelter operational feasibility and for providing grid demand-side service. As a demand-side power management approach, power modulation dynamically varies the aluminum production rate (thus power consumption) in response to power availability/price. While there were power modulation trials in the industry, many resulted in poor plant performance due to the operational difficulties caused by the spatial variations of process conditions and multi-timescale smelting cell dynamics. This paper presents studies on the feasibility and cell behavior under power modulation based on a first-principles spatially discretized dynamic material and energy balance model. Various combinations of process inputs (line current and interelectrode distance) were used to study the protective side ledge profile, as it should always be maintained for a well-performing, long-lasting cell. Simulation studies of repeated modulation cycles show that ledge does not solidify and dissolve in the same timeframe unless energy is rebalanced, while having slow dynamics thus only stabilizing after a few modulation cycles under a high-frequency modulation. This work contributes to the power modulation modeling and analysis of aluminum smelters, allowing for operational and control optimization.

Vorheriger Artikel Influence Mechanism of Zn on the Iron Ore-Sintering Mineralization Process

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Titel: Studies on Power Modulation of Aluminum Smelting Cells Based on a Discretized Mass and Thermal Dynamic Model
verfasst von: Choon-Jie Wong
Jie Bao
Maria Skyllas-Kazacos
Barry Welch
Mohamed Mahmoud
Alexander Arkhipov
Nadia Ahli
Publikationsdatum: 04.01.2023
Verlag: Springer US
Erschienen in: Metallurgical and Materials Transactions B / Ausgabe 2/2023
Print ISSN: 1073-5615
Elektronische ISSN: 1543-1916
DOI: https://doi.org/10.1007/s11663-022-02709-w

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