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Erschienen in:

2020 | OriginalPaper | Buchkapitel

Study of Heat Distribution Due to ACD Variations for Anode Setting

verfasst von : Choon-Jie Wong, Yuchen Yao, Jie Bao, Maria Skyllas-Kazacos, Barry J. Welch, Ali Jassim

Erschienen in: Light Metals 2020

Verlag: Springer International Publishing

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Abstract

The carbon anodes in a Hall-Héroult cell are continuously consumed and thus require periodic replacement. During the setting of a cold new anode, bath freezes around it, causing the anode current flow to be impeded and redistributed to the other anodes. The anode setting event introduces significant disturbances which affects cell stability and thermal balance. Common work practices, such as anode beam raising, affect the bath temperature in the entire cell, even for regions far away from where the anodes will be set. With measurements of anode current distribution, control strategies for anode setting can be optimized and improved, for example by preheating the region where anodes will be set. In this paper, the effects of raising groups of anodes on the distribution of bath temperature is investigated. The results show that heat generation can be targeted to specific regions in the bath, as well as to minimize the unwanted effect on ledge profile. Additionally, contrary to simple intuition, raising anodes in a particular bath region is shown to have a greater effect on other bath regions.

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Titel: Study of Heat Distribution Due to ACD Variations for Anode Setting
verfasst von: Choon-Jie Wong
Yuchen Yao
Jie Bao
Maria Skyllas-Kazacos
Barry J. Welch
Ali Jassim
Verlag: Springer International Publishing
Buch: Light Metals 2020
Print ISBN: 978-3-030-36407-6

Electronic ISBN: 978-3-030-36408-3

Copyright-Jahr: 2020
DOI: https://doi.org/10.1007/978-3-030-36408-3_73

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