Last update: July 28, 2015
Most flue gases produced by the combustion of fuels contain contaminants that can condense into sulfuric, sulfurous, or hydrochloric acid droplets. Flue Gas Dew Point Corrosion occurs when these aggressive acids condense on carbon and stainless steels in convection sections, flue ducts, and stacks. The amount of contaminants in the fuel is directly correlated with the concentration of the acid droplets, and therefore with the degree of corrosion.
There are several ways in which flue gas dew point corrosion can be avoided. More resistant materials can be used in the construction of flues, which can prevent corrosion. Also, limiting the number contaminants in heater and boiler fuels is another good way to prevent corrosion from occurring. Although, it should be noted that the latter method is far more difficult to accomplish, since most fuels contain sulfur compounds and some are contaminated with chlorides. Another way to prevent corrosion is to maintain the surface metal temperatures of exposed equipment above the dew point. Finally it is possible to protect cooler surfaces by applying a coating that is resistant to the acidic condensate and will withstand the temperatures to which it is exposed.
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May/June 2005 Inspectioneering Journal
By John Reynolds at Intertek
Most all flue gases produced by the combustion of fuels contain contaminants that can condense into acid droplets. The amount of contaminants will determine the concentration of the acid droplets.
Hydroblasting and waterlancing are the most commonly used methods to clean fouled process equipment. More often then not, these methods can fully clean heat exchangers and other process equipment. Sometimes, however, other cleaning methods such as grit blasting, chemical cleaning, and thermal decomposing are required to successfully clean equipment.