Patent ID: 9714179
Date: 2017-07-25
CPC Classifications: C02F,C23F,F22B

Claim:
1. A process of oxygenated feed-water treatment of boilers comprising: oxygenating a boiler feed water system in a first stage to form an oxide film in the boiler feed water system by adding oxygen into a circulating feed water of the boiler feed water system both at the outlet of a condensate polishing system of a low pressure feed water system and at the inlet of a feed water pump of a high pressure feed water system downstream of the outlet of the condensate polishing system, such that the amount of oxygen at the outlet of the condensate polishing system and at the inlet of the feed water pump are both 50-150 μg/L in the first stage and the concentration of dissolved oxygen in a main steam generated from the circulating feed water is controlled to be ≦5 μg/L in the first stage; determining that the oxide film in the boiler feed water system has been formed; and after determining that the oxide film has been formed, supplementing and maintaining, in a second stage, the oxide film by adjusting the oxygen addition or an oxygen exhaust at a deaerator upstream of the inlet of the feed water pump and downstream of the outlet of the condensate polishing system to reduce the amount of oxygen at the inlet of the feed water pump to the high pressure feed water system while maintaining the amount of oxygen at the outlet of the condensate polishing system at 50-150 μg/L, wherein the concentration of dissolved oxygen in the main steam is controlled to be ≦5 μg/L in the second stage.