Corrosion condition of the inner wall surface of the atmospheric tower in petroleum refining and chemical processing
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The image below shows the corrosion on the inner wall of the atmospheric tower in petroleum refining units. The structural type is vertical, with specifications of ф3800/ф4800×18/20×53361. The material is 16MnR, and the operating medium is priming oil. Temperature 180 degrees, pressure 0.196 MPa. This tower has been in use for over 2 years, and the top of the tower is severely corroded, with uniform corrosion as well as ulcerated areas of corrosion. This type of corrosion belongs to the H2S-HCl-H2O category. It is recommended to use composite panels, namely carbon steel combined with highly corrosion-resistant metal sheets, to effectively prevent corrosion.
In the petrochemical industry, corrosion of the inner wall at the top of towers is a common problem, especially when dealing with corrosive media under high temperatures and pressure. The tower you mentioned uses 16MnR as its material; under the influence of the initial bottom oil, after approximately two years of operation, it developed issues such as uniform corrosion and pitted corrosion. This indicates the presence of H2S, HCl, and H2O in this environment, substances that accelerate the corrosion process. In response to this situation, using composite panels (such as a carbon steel substrate covered with a highly corrosion-resistant metal plate) is indeed an effective anti-corrosion solution. This composite material not only provides the necessary mechanical strength but also enhances corrosion resistance, thereby extending the service life of equipment and ensuring production safety. It is recommended that when selecting materials and making design improvements, full consideration should be given to the corrosiveness of the medium, and appropriate corrosion-resistant materials should be chosen for optimization. .
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Indeed, polymer materials can solve the corrosion problem of some equipment.