Metallurgist1991
Materials
- Apr 14, 2016
- 3
There is a 100Ton industrial boiler which has to work with high sulfur content gas ( about 1000 ppm). Which kind of material you recommend us use for economizer tubes?
In HRSGs during Shut down period, gas side of the tubes may face with sulfuric acid corrosion (cold end corrosion) due to deposition of sulfur containing products and their reaction with condensate specially in humid plants. How can we calculate sulfuric acid concentration on tube surfaces? As you Know different materials have different corrosion resistant to different concentration of sulfuric acid. I think that the best way to overcome problem is to prevent condensation due to use of dehumidifiers. The use of dehumidifiers is not very common and I search for materials that could withstand this acidic condition. I think of using 304, 316, 430, 409 but sometimes A178 and A192 are used as a substitution. So could you please share your opinion about bellow questions :
-How much SO3 or So2 convert into sulfuric acid?
-How to calculate the sulfuric acid concentration?
- How to calculate the corrosion rate of tubes in this situation?
- Which material could withstand this acidic condition due to the corrosion rate and SCC?
- Is there any way to prevent acid formation apart from using dehumidifiers or increasing the water temperature of preheater?
In HRSGs during Shut down period, gas side of the tubes may face with sulfuric acid corrosion (cold end corrosion) due to deposition of sulfur containing products and their reaction with condensate specially in humid plants. How can we calculate sulfuric acid concentration on tube surfaces? As you Know different materials have different corrosion resistant to different concentration of sulfuric acid. I think that the best way to overcome problem is to prevent condensation due to use of dehumidifiers. The use of dehumidifiers is not very common and I search for materials that could withstand this acidic condition. I think of using 304, 316, 430, 409 but sometimes A178 and A192 are used as a substitution. So could you please share your opinion about bellow questions :
-How much SO3 or So2 convert into sulfuric acid?
-How to calculate the sulfuric acid concentration?
- How to calculate the corrosion rate of tubes in this situation?
- Which material could withstand this acidic condition due to the corrosion rate and SCC?
- Is there any way to prevent acid formation apart from using dehumidifiers or increasing the water temperature of preheater?