发明授权
US06402984B1 Composition for preventing corrosion using a sulfite-based oxygen scavenger
失效
使用亚硫酸盐型除氧剂防止腐蚀的组合物
- 专利标题： Composition for preventing corrosion using a sulfite-based oxygen scavenger
- 专利标题（中）： 使用亚硫酸盐型除氧剂防止腐蚀的组合物
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申请号： US09397025申请日： 1999-09-16
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公开(公告)号： US06402984B1公开(公告)日： 2002-06-11
- 发明人: Junichi Nakajima , Masazumi Yamashita , Kenichi Kimura
- 申请人： Junichi Nakajima , Masazumi Yamashita , Kenichi Kimura
- 优先权： JP8-94783 19970328; JP8-363539 19971215
- 主分类号： C02F170
- IPC分类号： C02F170
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 SO42− 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 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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