Optimal corrective feedwater treatment for supercritical power generating units
At Soviet power plants the pH of feedwater is usually controlled by adding ammonia, and hydrazine-hydrate to the suction side of the booster feedpumps. In order to determine optimum feedwater conditions to prevent corrosion of alloys in the feedwater circuit, the water chemistry of feedwater at 6 operating power plants was investigated. The investigations confirmed that hydrozine-hydrate is the agent most responsible for reducing corrosion of copper-containing alloys in the condensate circuit, that the hydrazine-hydrate should be added to the polished condensate instead of to feedwater leaving the deaerator, and that corrosion of steel is prevented with the aid of ammonia when maintaining pH at about 9.0. (LCL)
- OSTI ID:
- 7096172
- Journal Information:
- Therm. Eng. (USSR) (Engl. Transl.); (United States), Journal Name: Therm. Eng. (USSR) (Engl. Transl.); (United States) Vol. 22:10; ISSN THENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200104* -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AMMONIA
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COPPER ALLOYS
CORROSION
CORROSIVE EFFECTS
FEEDWATER
HYDRAZINE
HYDRIDES
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXYGEN COMPOUNDS
PH VALUE
POWER PLANTS
STEELS
THERMAL POWER PLANTS
WATER
WATER CHEMISTRY