METHOD FOR OPERATING BOILER, METHOD FOR INJECTING SULFITE BASE OXYGEN SCAVENGER AND COMPOSITION THEREOF

摘要

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 2in boiler water to under 500 ppm, and a method for injecting 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.