The multivariable model-based control of the non-alumina electrolyte variables in aluminum smelting cells |
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Authors: | Fiona J Stevens McFadden Barry J Welch Pual C Austin |
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Affiliation: | (1) Auckland, New Zealand;(2) BTG in Cambridge, England |
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Abstract: | This paper investigates the application of multivariable model-based control to improve the regulatory control of electrolyte
temperature, aluminum fluoride concentration, liquidus temperature, superheat, and electrolyte height. Also examined are therappropriateness
of different control structures and the possible inclusion of recently developed sensors for alumina concentration and individual
cell duct flowrate, temperature, and heat loss. For the smelter in this study, the maximum improvement possible with a multivariable
model-based controller is predicted to be 30–40% reduction in standard deviation in electrolyte temperature, aluminum fluoride
concentration, liquidus temperature, and superheat, and around half this for electrolyte height. Three control structures
were found to be appropriate; all are different than the existing control structure, which was found to be suboptimal. Linear
Quadratic Gaussian controllers were designed for each control structure and their predicted performance compared.
Comalco Research. |
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Keywords: | |
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