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:
Jul. 25, 2017
Filed:
Mar. 20, 2012
Zhouhai Qian, Zhejiang, CN;
Liwei Zhu, Zhejiang, CN;
Qiuyang Cao, Zhejiang, CN;
Shenglin Pang, Zhejiang, CN;
Likui Feng, Zhejiang, CN;
Xiulin Xiao, Zhejiang, CN;
Chen Zhou, Zhejiang, CN;
Canfei Hong, Zhejiang, CN;
Zhouhai Qian, Zhejiang, CN;
Liwei Zhu, Zhejiang, CN;
Qiuyang Cao, Zhejiang, CN;
Shenglin Pang, Zhejiang, CN;
Likui Feng, Zhejiang, CN;
Xiulin Xiao, Zhejiang, CN;
Chen Zhou, Zhejiang, CN;
Canfei Hong, Zhejiang, CN;
Z (P) EPC Electric Power Research Institute, Beijing, CN;
Abstract
The present invention provides a process of oxygenated feed-water treatment of boilers in power station, carried out under an OT treatment process, suitable for both the monotube type boiler and the drum type boiler, and comprising an oxygenation stage comprising: a normal oxygenation converting stage and a decreased oxygenation film-supplementing stage; the normal oxygenation converting stage is a stage in which the feed water system is oxygenated both at the outlet of a condensate polishing system and at the inlet of a feed water pump of a high pressure feed water system, and the concentration of dissolved oxygen in the main steam is controlled to be ≦5 μg/L; the decreased oxygenation film-supplementing stage is a stage in which, after an oxide film is formed in the feed water system, the amount of oxygenation at the high pressure feed water system is decreased so that the amount of the oxygen added is only for supplementing and maintaining the oxide film, while the concentration of dissolved oxygen in the main steam is controlled to be ≦5 μg/L. It can ensure that a dense protection film can be formed and maintained on the metal surface of the pipes in a feed water system, thereby reducing the iron content in the feed water; excessive oxygen is prevented from entering the high temperature heating surface and causing the peeling off of the oxide skin; and the amount of oxygen consumed is significantly reduced, thereby decreasing the amount of maintenance.