ANALYSIS OF CORROSION CASE IN A BOILER FEEDWATER SYSTEM
锅炉给水系统腐蚀原因分析

The corrosion damages in a boiler feedwater system are caused by CO 2 came from condensate and boiler make-up water, the general anti-corrosion measure is to adjust pH value of the water to about 9 0 with ammonia.When ammonia?carbon dioxide(CO 2)?organic matter(typical as CH 3COOH) coexist,an exact expression for feedwater pH value calculation was obtained by chemical equilibrium equation.According to the relevant parameters of feedwater heating for 300MW and 600MW generating units,the exact pH values may be deduced and then showed as graphics.In the meanwhile,the cause for corrosion in feedwater system is analysed briefly,thereby the suitable prevention measure is also given.