Method for preventing corrosion using a sulfite-based oxygen sca

Details Method for preventing corrosion using a sulfite-based oxygen sca Method for preventing corrosion using a sulfite-based oxygen sca

1998-03-27

2000-02-22

McKane, Elizabeth

Chemical apparatus and process disinfecting, deodorizing, preser

Process disinfecting, preserving, deodorizing, or sterilizing

Maintaining environment nondestructive to metal

422 14, 422 40, 210750, 25218828, C23F 1100, C23F 1106, C23F 1116

Patent

active

060276878

ABSTRACT:
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 SO.sub.4.sup.2- in 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 Na.sub.2 SO.sub.3, K.sub.2 SO.sub.3, NaHSO.sub.3 and KHSO.sub.3 ; 1-20 weight % of NaOH or KOH; 0.2-2 weight % of potassium sorbate; and 5-500 ppm of CoSO.sub.4.

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