Method and apparatus for heat treatment including h2/h20...

C - Chemistry – Metallurgy – 21 – D

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C21D 1/78 (2006.01) C21D 1/76 (2006.01) C21D 3/04 (2006.01) C21D 11/00 (2006.01)

Patent

CA 2197015

A closed-loop control system controls introduction of either water or hydrogen into a furnace region where a part is subjected to an elevated temperature to accomplish a heat treatment process. The heat treatment process causes the part to participate in reduction and/or oxidation reactions which remain in balance at the elevated temperature so long as a hydrogen/water ratio set point is maintained. The system includes an oxygen probe in communication with the furnace region for providing (i) an oxygen output indicative of sensed oxygen concentration within furnace region, and (ii) a temperature output indicative of temperature therein. A controller determines from the oxygen output and temperature output, a measured ratio of hydrogen to water within the furnace region and compares the measured ratio with the hydrogen/water ratio set point, and provides a correction signal output in accordance with a determined difference between the measured ratio and the ratio set point. A flow controller is responsive to the correction signal output to provide a flow of at least one of hydrogen and water to the furnace region to move the hydrogen/water ratio towards said ratio set point.

L'invention concerne un système de commande en boucle fermée servant à commander l'introduction d'eau ou d'hydrogène dans un four dont une partie est soumise à une température élevée pour la mise en oeuvre d'un procédé de traitement thermique. Dans le cadre du procédé de traitement thermique, cette partie du four entre en jeu dans des réactions de réduction et/ou d'oxydation qui restent en équilibre à haute température pour autant que le rapport nominal hydrogène/eau soit maintenu. Le système comporte une sonde d'oxygène qui est en communication avec ladite partie du four et qui fournit (i) une valeur indicative de la concentration d'oxygène dans ladite partie du four et (ii) une valeur indicative de la température qui y règne. Un contrôleur mesure, à partir de ces valeurs indicatives, le rapport hydrogène/eau dans la dite partie du four, compare ce rapport au rapport nominal et fournit un signal de correction établi en fonction de la différence entre les deux rapports. Un contrôleur de débit asservi au signal de correction régule le débit de l'hydrogène ou de l'eau à ladite partie du four de manière à ramener le rapport hydrogène/eau vers le rapport nominal.

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