Abstract
A new concept of heat exchanger has been developed to cool down exhaust gases of aluminum electrolysis pots before entering a Gas Treatment Center (GTC). It optimizes operating conditions on a GTC, by reducing gas flow rates and enabling energy recovery. A prototype of heat exchanger was installed and tested for 12 months on five pots of the Norsk Hydro aluminum plant in Øvre Årdal, Norway. This prototype consisted of a bundle of finned oval tubes. Off-gas flows cross flow on the external side of the tubes. The oval shape is beneficial in terms of high gas-side heat transfer and low pressure drop. Fins ensure a compact design while being robust to gas-side fouling. Heat transfer characteristics were monitored and are presented. Stable and safe operation has been demonstrated with an early stage heat transfer reduction of approximately 10 to 15% due to fouling, which is lower than theoretical predictions.
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References
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© 2016 The Minerals, Metals & Materials Society
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Bouhabila, E.H., Næss, E., Einejord, V.K., Kristjansson, K. (2016). An Innovative Compact Heat Exchanger Solution for Aluminum Off-Gas Cooling and Heat Recovery. In: Sadler, B.A. (eds) Light Metals 2013. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-65136-1_135
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DOI: https://doi.org/10.1007/978-3-319-65136-1_135
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-65135-4
Online ISBN: 978-3-319-65136-1
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