The anti-corrosion and non-anti-corrosion effects on the tube bundle of the overhead cooler in the catalytic distillation tower for heavy oil in the petrochemical industry are different

The photos from the site shared by the original poster are very clear; the differences in corrosion between the two types of tube bundles are indeed quite noticeable! In the operating conditions of this tower top aftercooler, hydrogen sulfide and condensed water are present, which makes dew point corrosion likely to occur. Here are a few suggestions for you: First, check whether the tubes that are severely corroded happen to be in those sections of the tube bank where oil and gas tend to condense and accumulate, as there may be differences in the local concentration or flow rate of the medium ； If anti-corrosion modifications are to be carried out, it is best to first select an appropriate anti-sulfidation and anti-dew point corrosion coating or alloy tube bundle based on the actual operating conditions; conducting strip testing in advance is a more reliable approach ； During subsequent operation and maintenance, the corrosion of the tube bundles can be monitored regularly, and accumulated liquid should be cleared promptly. Additionally, it is recommended to consult a professional petrochemical operation and maintenance team when upgrading such petrochemical equipment, in order to avoid disrupting normal production.