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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Fired heater stack corrosionFired heater stack corrosion
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3/10/2005 9:00 AM
 
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We are facing a repetitive corrosion in a fired heater stack. This heater is a balanced draft heater with Flue gas temperature of 195 deg C , against dew point of 150 deg C. What could be the reasons for the same,also what causes corrosion of refractory , and how it can be corrected. Thanking you in anticipation please.
 
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3/10/2005 9:00 AM
 
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Sgoel: It is not clear to us whether corrosion (deterioration) is occurring to a metal substrate or to an insulating refractory lining. It is also not clear why a refractory lining is in use at 195C. You might also elaborate on the makeup of the combustion gases. David Hendrix The Hendrix Group Inc.
 
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3/10/2005 9:00 AM
 
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David Thanks a lot for reply. The flue gas is containing about 74% N2, 12% CO2, 10.2 % H2O, 3.5 % O2 and 0.3 % SO2. Corrosion is taking place on the metal. But the problem starts with degradation of refractory, causing corrosion flue gases to get cooled. This results in dew point corrosion of steel. Hope I made myself clear. Best Regards Shashank Goel
 
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3/23/2005 9:00 AM
 
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Sgoel: Your metal substrate corrosion is most probably occurring due to dew point corrosion, with the condensate pH being depressed by CO2. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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3/23/2005 9:00 AM
 
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Goel As David says I suppose with that Flue gas temperature of 195 deg C you don’t need a refractory lining. As the refractory act as an insulating it will force the dew point formation underneath the refractory and you will get corrosion on stack plates. If you need to conserve that temperature of 195 deg C why not to put a thermal insulation (rock wool blankets plus aluminium weatherproofing)outside of the stack? Regards Luis Marques
 
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