Method for operating boiler, method for injecting sulfite...

C - Chemistry – Metallurgy – 23 – F

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C23F 11/16 (2006.01) C23F 11/10 (2006.01) C23F 11/18 (2006.01)

Patent

CA 2233420

The invention effectively prevents occurrence of corrosion in water tubes or the like of boilers. The invention provides a method for operating a boiler, including regulating a concentration of sulfate ions SO4 2- in boiler water to under 500 ppm, and a method for infecting a sulfite base oxygen scavenger, including setting a concentration of residual dissolved oxygen in boiler feed water to 2 - 4 ppm. The invention further provides a sulfite base oxygen scavenger composition comprising: 3 - 30 weight % of at least one selected from a group consisting of Na2SO3, K2SO3, NaHSO3 and KHSO3; 1 - 20 weight % of NaOH or KOH; 0.2 - 2 weight % of potassium sorbate; and 5 - 500 ppm of CoSO4.

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