Abstract:

The pressure difference in the debutanizer of the steam cracker of a company frequently increased during normal operation due to the gradual accumulation of coke in the distillation column, resulting in off-spec products and bringing great potential hazard to the stable operation of the unit. The analysis results showed that the accumulation of coke was caused by multiple factors including the water entrained in the feed to condensate stripper, the trace oxygen brought in during equipment maintenance, the rust of distillation tower tray and the heavier cracking feedstock. By optimizing the operation, strengthening process monitoring and adding inhibitor injection process flow, the pressure difference in debutanizer returned to normal and stable operation was achieved.

Key words: coking')">

coking, causal analysis, countermeasure

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