In power plants, reducing the temperature of the flue according to the routine will cause the flue to be corroded by acid. Common hazards include dust blockage, corrosion, and air leakage.
Air preheaters, because the wall temperature is below the acid dew point, cause severe corrosion. See Figure 01.
Heat exchangers made of ND corrosion-resistant steel have severe corrosion in less than a year because the wall temperature is lower than the acid dew point.
See Figure 02.
After using Nernst’s in-line acid dew point analyzer, real-time acid dew point values can be accurately determined, the heat exchanger operates for one year without corrosion or ash, and the discharge temperature is lowered.See Figure 03.
Post time: Apr-13-2023