CORROSION ANALYSES OF DILUTED STEAM GENERATING SYSTEM OF EA1123 ETHYLENE PLANT

The leakage due to corrosion of the dilution steam generator of ethylene plant EA1123 occurred 13 times in recent 17 months.According to a detailed analysis of the corrosion reasons in the equipment and technology,main reason was regarded as that there was a mass of sulfide and alkali in water and subseguently NaOH-H2S-H2O corrosion system was formed.The localized corrosion perforation of the outer heat-exchange tube was caused by the strong acid and alkaline corrosion system produced by evaporating concentration of the corrosive medium in the dilution steam generator.Some protection measures are proposed.