Corrosion condition of the outer wall of the tube bundle in the primary vacuum condenser for petroleum refining and chemical processing
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The image below shows the tube bundle of the overhead pre-condenser in the atmospheric and vacuum distillation towers used in the petrochemical industry. The model is FLB1200-395-16-4, and the tube bundle material is 10# steel. The operating condition is that the tube side contains deep well water, while the shell side contains oil, vapor, and steam ； Operating temperature: 34 degrees for the tube side and 204 degrees for the shell side ； The pressure in the tube side is 0.2 MPa, while the shell side is under negative pressure. This tube bundle has been in use for over a year, and the oil, gas, and water vapor in the shell side have caused significant corrosion to the outer wall of the tube bundle. This type of corrosion belongs to the H2S-ClH-H2O system corrosion on the oil and gas side. It is recommended that a coating be applied to the outer wall of such tubes to prevent corrosion, which can solve this problem.
For the tray pre-condenser tube bundles of this type used in petrochemical industries, since the oil, vapor, and water vapors in the shell side contain components such as H2S, HCl, and H2O – all of which are highly corrosive substances – they can cause severe corrosion to the outer walls of the tube bundles made of 10# steel. Therefore, using a coating for anti-corrosion treatment is an effective solution. Choosing the appropriate anti-corrosion coating to ensure the integrity and corrosion resistance of the coating can significantly improve the durability of the tube bundle and extend the service life of the equipment. During construction, it is necessary to ensure that the surface of the tube bundle is clean and dry, with a uniform coating free from any damage, in order to achieve the best corrosion protection. .