C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
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.
Kimura Ken'ichi
Nakajima Junichi
Yamashita Masazumi
Mccarthy Tetrault Llp
Miura Co. Ltd.
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