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Latest progress in IPCC methodology for estimating the extend of PFC greenhouse gases co-evolved in the aluminium reduction cells and challenges in reducing these emissions

Wong David, Welch Barry, Nunez Pernelle, Dion Lukas et Spirin Alexey. (2019). Latest progress in IPCC methodology for estimating the extend of PFC greenhouse gases co-evolved in the aluminium reduction cells and challenges in reducing these emissions. Dans : 37th International Conference and Exhibition of ICSOBA , 16 to 20 September 2019, Krasnoyarsk, Russia.

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In recent years, the primary aluminium industry has increasingly found that perfluorocarbon (PFC) greenhouse gases can be co-evolved in reduction cells during normal operation, i.e. without an anode effect (AE) that is typically defined as when cell voltage exceeds 8 V. Other than during an AE, PFC co-evolution rates are invariably low. However, because of the long duration of these ‘low voltage’ emissions they can contribute as much than 90 % of a smelter’s total PFC output, depending on cell technology, practices and operating conditions. These emissions help explain some of the discrepancy between ‘top-down’ global atmospheric estimates of PFCs vs. ‘bottom-up’ industry estimates via the International Aluminium Institute (IAI). To provide a more complete estimate of total greenhouse gas emissions, the Intergovernmental Panel for Climate Change (IPCC) is updating its PFC accounting guidelines for the aluminium industry, covering both anode effect and low voltage emissions – respectively termed ‘high voltage anode effect’ (HVAE) and ‘low voltage anode effect’ (LVAE) emissions in the guidelines. The following paper summarises some of the latest progress in this. While the updated 2019 IPCC Refinements provides an important first step in estimating all PFCs co-evolved in the aluminium reduction cell, this paper also explores some of the challenges that remain – firstly in finding a more scientific basis to estimate low voltage PFCs for future IPCC methodologies; and secondly but more importantly, for smelters to determine strategies to detect and mitigate low voltage emissions when they occur.

Type de document:Matériel de conférence (Non spécifié)
Date:16 Septembre 2019
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
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Mots-clés:Perfluorocarbons, greenhouse gas emissions, IPCC methodology, anode effect PFCs, low voltage PFCs, perfluorocarbures, émissions de gaz à effet de serre, méthodologie du GIEC, PFC à effet d'anode, PFC basse tension
Déposé le:22 janv. 2021 00:54
Dernière modification:26 janv. 2021 22:53
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