Cleaning process for removing magnetite-containing deposits...

Details Cleaning process for removing magnetite-containing deposits... Cleaning process for removing magnetite-containing deposits...

C - Chemistry, Metallurgy

23

G

C23G 1/00 (2006.01) C02F 5/08 (2006.01) F28G 9/00 (2006.01) G21F 9/00 (2006.01)

Patent

CA 2586556

The invention relates to a cleaning method for removing deposits containing magnetite out of a pressure vessel of a power plant, during which the deposits are treated with an aqueous cleaning solution, which contains a reducing agent and which is heated to an elevated cleaning temperature, in order to reduce iron III ions to iron II ions. The invention is characterized in that a cleaning solution is introduced into the pressure vessel. This cleaning solution contains an initial substance that releases the reducing agent under the conditions existing during cleaning. Hexamethylenetetramine is preferably used as the initial substance.

L'invention concerne un procédé de nettoyage permettant d'éliminer des dépôts contenant de la magnétite d'une cuve sous pression d'une centrale électrique. Les dépôts sont traités à l'aide d'une solution de nettoyage aqueuse chauffée à une température de nettoyage augmentée et contenant un agent de réduction, pour réduire des ions de fer III en ions de fer II. L'invention est caractérisée en ce que l'on introduit une solution de nettoyage dans la cuve sous pression. Cette solution de nettoyage contient une présubstance qui libère l'agent de réduction dans les conditions régnant pendant le nettoyage. On utilise comme présubstance, de préférence, de l'hexaméthylèntétramine.

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