Corrosion in the overhead of atmospheric pressure towers
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The atmospheric pressure tower has been in operation for 40 days, and corrosion-induced perforations have already occurred in the new pipeline, which is 8 MM thick. Since it is a unit that was modified later on, the load on the top of the atmospheric pressure tower has always been low, with the temperature of the overhead circulation fluid being around 90°C. Could it be that the low temperature of the overhead circulation fluid caused the water injected at the top of the tower to form acid, thereby leading to corrosion? Dear experts, please help analyze this
Personally, I wonder if it could be a problem with the material/quality of the pipeline itself? Isn’t it a bit fast for the new pipeline to develop corrosion and perforations after just 40 days of operation?
Are you not using a corrosion inhibitor, or is the material choice incorrect?
It is also closely related to the sulfur content of the raw materials
The temperature of the top circulation extraction is low, resulting in dew point corrosion. The top circulation system also lacks corrosion protection measures, and its material quality is poor as well.
The top temperature is too low, resulting in dew point corrosion; it is recommended to increase the top temperature, improve the management of the \"one removal and four injections\" process in the unit, and find ways to increase the load on the tower top in order to avoid dew point corrosion
The temperature at the top circulation extraction is only 90, which is too low; for those with high sulfur content, the temperature in the top circulation return tower is kept at least at 90
90-degree dew point corrosion is the most severe; it is recommended to maintain a pH level of 7–8 and raise the maximum temperature to around 120 degrees
Neutralizing and corrosion-inhibiting agents are added at the top of the tower; appropriately raising the temperature at the top may lead to dew point corrosion
Pouring liquid ammonia at the top of the tower can also neutralize it! It’s just about upgrading the materials