A question about dew point corrosion
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Dew point corrosion in the convection section of the heating furnace is due to the formation of (C) dewdrops when the temperature of the outer surface of the heat exchange surface is lower than the flue gas dew point temperature, leading to corrosion. A. Sulfuric acid B. Hydrochloric acid C. Nitric acid D. Carbonic acid How is C?
Obviously wrong, if only nitric acid could be formed so easily, it should be sulfuric acid! ! ! ! !
It should be A. Only sulfuric acid has the lowest dew point. Corrosion in the convection section or air preheater is due to the formation of sulfuric acid from SO2 in the flue gas, causing equipment corrosion.
Nitric acid will not be formed in the convection part. Only sulfuric acid has the lowest dew point temperature, and the sulfuric acid formed is also sulfuric acid. In operation, dew point corrosion is almost always sulfuric acid.
H20+S02---H2SO4 SO2 and H20 in the flue gas form sulfuric acid, causing equipment corrosion.
The dew point corrosion of flue gas is mainly caused by sulfuric acid. SO2+O2→SO3 SO3+H2O→H2SO4
SO2 and H20 in the flue gas form sulfuric acid, causing equipment corrosion.
study* study * , I personally think it’s sulfur dioxide
I think it should be nitric acid. Nitric acid is not easy to form.