Corrosion of the gasoline water cooler tube bundle in petrochemical reforming units and recommendations
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This post was last edited by Wang Wei2 on 2024-10-19 at 10:05. The tube bundle specification is BJS800-2.5-170-6/25-2II; the material of the tube bundle is 10# steel, and the operating parameters are shown in the table. The tube bundle was scrapped due to corrosion after less than 1 year of use. The tube bundle is corroded due to the formation of an HCl-H2O corrosion environment in the areas affected by low temperatures. It is recommended to use a polymer coating for anti-corrosion in this area, which can solve this problem. The specific corrosion conditions can be seen in the following images. Medium, Operating temperature °C, Operating pressure MPa, Shell side, Tube side, Inlet pipe, Outlet pipe, Shell inlet, Shell outlet, Tube side, Shell side: Gasoline, Hydrogen, Water, 18, 35, 104, 25, 0.3, 1.2
Teacher: The corrosion problem of polymer coating layers has been solved. How is the cooling effect (remains the same, or better than before)? What polymer coating should be used? Please give me some advice.
The tube bundle suffers severe corrosion due to the formation of a corrosive environment containing HCl and H2O in the low-temperature areas. It is recommended to use a polymer coating on this area for anti-corrosion treatment, in order to slow down or prevent corrosion from occurring. .
That’s right; once the corrosion and scaling problems are resolved. The thermal resistance of the coating is negligible here compared to that of rust. There is a titanium nanopolymer coating that yields good results.
Generally, for the corrosion protection of heat exchangers, it usually involves the tube bundles of water coolers; circulating water flows inside the tubes, while outside the tubes there is gasoline, oil, etc. A operating temperature of no more than 150 degrees is advisable. This allows for the use of a coating solution.