The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2002
Filed:
Sep. 16, 1999
Applicant:
Inventors:
Assignee:
Miura Co., Ltd., Ehime, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C02F 1/70 ;
U.S. Cl.
CPC ...
C02F 1/70 ;
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 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 SO , K SO , NaHSO and KHSO ; 1-20 weight % of NaOH or KOH; 0.2-2 weight % of potassium sorbate; and 5-500 ppm of CoSO .