【Corrosion Technology Edition】Daily Question 20170810: What is dew point corrosion?
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Flue gas dew point corrosion occurs because sulfur in the fuel generates SO2 and SO3 during combustion; when the outer surface temperature of the heat exchange surface is below the flue gas dew point temperature, sulfuric acid mist droplets form on that surface, leading to corrosion of the heat exchange surface.
Dew point corrosion occurs because sulfur in the fuel generates SO2 and SO3 during combustion; when the outer surface temperature of the heat exchange surface is lower than the dew point temperature of the flue gases, sulfuric acid mist droplets form on that surface, leading to corrosion of the heat exchange surface.
Dew point corrosion occurs because sulfur in the fuel generates SO2 and SO3 during combustion; when the outer surface temperature of the heat exchange surface is lower than the dew point temperature of the flue gases, sulfuric acid mist droplets form on that surface, leading to corrosion of the heat exchange surface.
Flue gas dew point corrosion occurs because sulfur in the fuel generates SO2 and SO3 during combustion; when the outer surface temperature of the heat exchange surface is below the flue gas dew point temperature, sulfuric acid mist droplets form on that surface, leading to corrosion of the heat exchange surface. The corrosion caused by hydrogen sulfide occurs at temperatures typically ranging from 80°C to 90°C; therefore, the top temperature of all towers containing hydrogen sulfide should be kept away from this temperature range. Usually, water is injected at the tower top to avoid such temperatures.
Dew point corrosion: This occurs because sulfur in the fuel is converted into SO2 and SO3 during combustion; when the outer surface temperature of the heat exchange surface is lower than the dew point temperature of the flue gases, sulfuric acid mist droplets form on that surface, leading to corrosion of the heat exchange surface.
It occurs when the process gas reaches its phase transition point during cooling, resulting in liquid condensation. If there are certain acidic substances present in the medium (such as sulfur, chlorine, nitrogen, etc.), they will accumulate in the condensed water and form acids that cause corrosion of the metal
The dew point of flue gas containing sulfuric acid vapor rises significantly; when the wall temperature of the heating surface is below this dew point, the sulfuric acid-containing vapor condenses on the heating surface to form a sulfuric acid-containing liquid, causing severe corrosion to the heating surface. Since it occurs on the heated surface at lower temperatures, it is called low-temperature corrosion. Since this type of corrosion occurs only after dew forms on the heated surface, it is also known as dew point corrosion.
In pipes or equipment used for transporting or handling corrosive media, when the temperature of their surfaces in contact with these media is below the dew point temperature of the corrosive medium, the medium will condense into liquid droplets on the metal surface, thereby causing corrosion of the equipment or pipes.
Dew point corrosion, in a general sense, refers to the formation of liquid dew (i.e., the dew point) when the process gas reaches its phase transition temperature during cooling. Conversely, the temperature at which a liquid rises to vaporization-boiling is called the boiling point. The temperatures of the two are the same, but the level of heat capacity differs by the latent heat of vaporization. At this time, if there are some acidic substances in the medium (such as sulfur, chlorine, nitrogen, etc.), they will accumulate in the condensed water to form acids.
It refers to the corrosion caused to materials by saturated steam condensing into a liquid as a result of cooling.