Device for securing a furnace provided with a rapid cooling...

C - Chemistry – Metallurgy – 21 – D

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C21D 9/56 (2006.01) F27D 99/00 (2010.01) C21D 1/42 (2006.01) C21D 1/613 (2006.01) C21D 9/573 (2006.01) C21D 9/60 (2006.01)

Patent

CA 2655924

A device enabling limitation of the risk of formation of an explosive atmosphere in the furnace of a continuous heat treatment line of metal strips the sections of which are under an atmosphere consisting of a mixture of inert gas and hydrogen the hydrogen volume content of which is between 5 and 100%, provided with a rapid induction heating section and a rapid cooling section comprising: a chamber (9) maintained under inert gas at the inlet of the rapid heating section of the furnace and at the outlet of the rapid cooling section, the pressure in the chamber (9) being equal to or greater than the atmospheric pressure when the heating of the furnace operates normally; a device (10) for entering the strip into the chamber (9), from the atmospheric air; a device (11) for atmosphere separation and for entering the strip in the heating section of the furnace from the chamber (9) under inert gas, said device (11) being provided with a gas take-off (4); a device (13) for atmosphere separation and for removing the strip from the rapid cooling section of the furnace, provided with a gas take-off (14), and a device (12) for removing the strip from the chamber (9) towards the atmospheric air.

Dispositif permettant de limiter le risque de formation d'une atmosphère explosive dans le four d'une ligne continue de traitement thermique de bandes métalliques dont les sections sont sous une atmosphère constituée d'un mélange de gaz inerte et d'hydrogène dont la teneur volumique en hydrogène est comprise entre 5 et 100%, équipé d'une section de chauffage rapide ô induction et d'une section de refroidissement rapide, comprenant : une chambre (9) maintenue sous gaz inerte ô l'entrée de la section de chauffage rapide du four et ô la sortie de la section de refroidissement rapide, la pression dans la chambre (9) étant égale ou supérieure ô la pression atmosphérique lorsque le chauffage du four fonctionne normalement; un dispositif (10) d'entrée de la bande dans la chambre (9), ô partir de l'air atmosphérique; un dispositif (11) de séparation d'atmosphère et d'entrée de la bande dans la section de chauffage du four depuis la chambre (9) sous gaz inerte, ce dispositif (11) étant équipé d'un soutirage (14) de gaz; un dispositif (13) de séparation d'atmosphère et de sortie de la bande de la section de refroidissement rapide du four, équipé d'un soutirage (14) de gaz, et un dispositif (12) de sortie de la bande de la chambre (9) vers l'air atmosphérique.

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