Corrosion prevention and control strategy for amine regenerator bottom system in MDEA unit based on process optimization
The lean amine system at the bottom of amine regenerator was the hardest hit area for corrosion in amine regeneration unit,including reboiler,feed and return pipelines and regenerator.A large number of cases showed that its corrosion mechanism included RNH2-H2S-CO2-C1--H2O system corrosion,amine cracking,cavitation and scouring corrosion.The corrosive media in amine solution such as H2 S,CO2,thermal stable salt,oxygen content,acidic gas load,impurities,solid particles,as well as flow rate and operating temperature were all important factors affecting corrosion.Based on process analysis of the bottom system of amine solution regenerator in MDEA unit and the latest foreign standards,process optimization suggestions for corrosion pre-vention were put forward.In addition to monitoring the corrosion content in lean amine solution,which can be controlled through online purification facilities and enhanced filtration management,corrosion prevention of regenerator bottom system can also be strengthened from the perspective of process optimization,such as reasonable control of flow rate,temperature and regeneration amount.
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