With the increase of the proportion of imported crude oil in atmospheric & vacuum distillation unit, corrosion of the equipment was getting severe, especially on the low temperature part of tower top. To effectively inhibit the corrosion rate, the injection amount was optimized for several times, but the result was not distinctive.Through the analysis to the condensate water on the tower top ,we found the concentration of iron ions rose greatly , which indicated the corrosion on low temperature part of the tower top was serious. Therefore, neutralization film-forming corrosion inhibitor was used in the device and achieved better corrosion-inhibiting effect.

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