A method and equipment for heat recovery

C - Chemistry – Metallurgy – 25 – C

Patent

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Details

C25C 3/22 (2006.01) F27D 17/00 (2006.01) F28F 1/10 (2006.01) F28F 19/00 (2006.01)

Patent

CA 2574717

The present invention relates to a method and equipment for recovering heat from exhaust gas removed from an industrial process, such as an electrolysis process for the production of aluminium. Heat is recovered by means of an extraction/suction system, where the exhaust gas contains dust and/or particles. The heat is recovered as the exhaust gas is brought into contact with heat-recovery elements. Flow conditions and the design of the heat recovery elements are such that the deposits of the dust and/or particles on the surfaces stated are kept at a stable, limited level. In preferred embodiments, the heat-recovery elements have a circular or an extended, elliptical cross-section and may be equipped with fins or ribs.

L'invention porte sur un procédé et un équipement permettant de récupérer la chaleur des gaz de combustion émis par un processus industriel, par exemple un processus d'électrolyse pour la production d'aluminium. La chaleur est récupérée au moyen d'un système d'extraction/aspiration, les gaz de combustion contenant de la poussière et/ou des particules. La chaleur est récupérée au fur et à mesure que les gaz de combustion sont mis en contact avec des éléments de récupération de chaleur. Les conditions d'écoulement et la conception des éléments de récupération de chaleur sont telles que les dépôts de poussière et/ou de particules sur les surfaces sont maintenus à un niveau limité stable. Dans des modes de réalisation préférés, les éléments de récupération de chaleur possèdent une section transversale circulaire ou elliptique, étendue, et peuvent être équipés d'ailettes ou d'arêtes.

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