Boiler Film Forming Amines Hydrocarbon Engineering

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Courtesy of Kurita

A good treatment programme for boiler feed water is crucial to the smooth operation of steam generators. Faulty treatment can cause damage to the plant, with attendant high costs. Traditional treatment programmes have three components: oxygen scavengers, alkalising amines, and phosphate. In a treatment programme based on film forming amines (FFAs), the functions of both oxygen scavenger and phosphate are replaced by the FFAs. FFAs form a thin compact film on the metallic surfaces, preventing oxygen from coming into contact with the metal, and therefore preventing corrosion. In contrast to an oxygen scavenger, film forming amines are not consumed by reacting with oxygen. In addition, their volatility means that they protect the complete steam system, unlike some oxygen scavengers, e.g. sulfite. FFA based programmes are all organic and, therefore, make scarcely any contribution to the conductivity of the boiler water. In comparison to phosphate and sulfite, higher concentration cycles can be achieved, leading to lower amounts of blowdown water and, therefore, to a significant reduction in energy losses. New studies with FFAs have shown that the coefficients of heat transmission from the heating tubes into the water phase are significantly higher than when phosphate treatment is used. As a consequence, lower exhaust gas.

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