Corrosion issues in the regeneration and incineration of spent acid
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In our company’s alkylation waste acid regeneration unit, the casing has been corroded by condensed acid in various areas such as the incinerator and preheating boiler, and the cast material is seeping out. Could you advise on how to resolve this issue?
Will it be better after insulating the exterior wall?
Generally, the outer wall temperature of the incinerator should not be lower than 245°C; otherwise, acid dew point corrosion is likely to occur. Check if it’s because the external wall temperature is too low
1. The outer layer of the pouring material should be made of acid-resistant material. 2. Proper insulation for the outer wall is necessary to keep it above the dew point; the exact dew point depends on the concentration of acidic gases
The first thought is that the insulation on the outer wall wasn’t done properly, resulting in dew point corrosion
Yes, it’s the acid dew point. This value is also provided when communicating with foreigners
Leakage is related to factors such as the water content and sulfur trioxide content in the flue gas; this is determined through calculations. However, reducing the water content in the waste acid, along with ensuring proper insulation of the equipment, are methods that can help minimize corrosion
However, the insulation should not be too thick, otherwise it can easily cause the outer wall to overheat.
Has the corrosion issue with your equipment been resolved? Does the equipment have a long operating life? Is there any blockage in the heat exchanger?
Sulfur dioxide is produced after the decomposition of waste acid. Doesn’t sulfurous acid have a very low dew point? After all, the furnace pressure is also quite low