Furnace run length extension by fouling control

B - Operations – Transporting – 08 – B

Patent

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Details

B08B 17/00 (2006.01) B08B 9/04 (2006.01) C10G 75/00 (2006.01) C23F 11/02 (2006.01) F28G 13/00 (2006.01)

Patent

CA 2456764

The invention relates to a method for cleaning the surface of an alloy comprising a base metal and an alloying metal, comprising the steps of: (a) pigging said alloy surface; and thereafter (b) passivating said alloy by contacting said surface with a gas comprising steam for a time and at a temperature sufficient to form at least on mixed oxide layer on said alloy wherein said mixed metal oxide contains an average alloying metal content of from equal to the alloying metal content in said alloy up to 100% alloying metal. The method is particularly applicable in increasing the run length in a refinery process conducted in a unit having alloy surfaces susceptible to fouling.

La présente invention concerne un procédé de nettoyage de la surface d'un alliage comprenant un métal de base et un métal d'alliage. Ce procédé consiste (a) à racler cette surface d'alliage, puis (b) à passiver cet alliage par une mise en contact de la surface avec un gaz comprenant de la vapeur pendant une durée et à une température suffisante pour former au moins une couche d'oxyde mélangé sur cet alliage, cet oxyde métallique mélangé contenant un contenu en métal d'alliage moyen partant d'une proportion égale au contenu en métal d'alliage de cet alliage et allant jusqu'à 100% de contenu en métal d'alliage. Ce procédé convient particulièrement pour augmenter la durée d'utilisation d'un processus de four d'affinage conduit dans une unité possédant des surfaces en alliage susceptibles de s'encrasser..

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