Hidden Danger of Boiler Phosphate Treatment and its Countermeasures

There is serious phosphate-hiding phenomenon in No.3 boiler of certain thermal power plant after general overhaul.The tracing and analysis are conducted to the process of phosphate-hiding phenomenon.The main reason is found out that temperature deviation at different boiler measurement point is relatively high,the flame temperature near water wall even exceeds 1400℃.It is reasonable to control the phosphate density of No.3 boiler water between 0.2～0.7 mg/L.Pipe cutting inspection after 3 year's operation proves that this treatment method has obtained expected result.