化学清洗技术在延迟焦化装置分馏系统中的应用

Application of Chemical Cleaning Technique on Distillation System in Delayed Coker

关键词:  延迟焦化  分馏系统  化学清洗技术  柠檬酸  污垢

Key words:  delayed coker  distillation system  chemical cleaning technique  citric acid  fouling

摘要:

中国石油克拉玛依石化分公司延迟焦化装置分馏系统停工期间采用化学清洗技术,并针对重油加工装置污垢的特点,选用主要成分为柠檬酸的SureCleanTM4231复合清洗剂,对分馏系统依次进行蒸汽加药剂清洗、水循环加药剂清洗、清水冲洗及钝化等处理,有效地清除了系统中的重油、轻油垢、无机盐垢、锈垢及焦泥等污垢,死角清洗到位,管线清洗干净,消除了清洗系统内部的可燃气体、H2S、CO及FeS,为检修施工提供了安全的作业环境,加快了检修进度,达到了预期目的,可以保证延迟焦化装置开工以后,分馏系统节能增收,高效运行。该方法值得进一步推广和运用。

Abstract:

The chemical cleaning technique for heavy oil fouling is adopted in delayed coking unit of Karamay Pet-rochemical Company PetroChina to clean oil and coke fouling from pipe and equipment during downtime. SureClean4231complex cleaner with major component of citric acid is usedin the distillation system. The cleaning processes include steam-chemical injection cleaning,water-chemical injection cleaning,water cleaning and passivation. The results show that after the advanced chemical cleaning technique is applied,all kinds of fouling are cleaned out effectively suchas heavy oil fouling,light oil fouling,salt fouling,rust fouling and coke fouling. The unit is very clean and has no deadangle. Light hydrocarbon,sulfureted hydrogen,carbon mon-oxide and iron monosulfide is cleaned out. So the process provides safe work environment and quick maintenance operation. The expected effect is met effectively. So the tech-nique is able to ensure the distillation system high-efficiency operation with low consumption of energy and high liquidyield. It is worth further spreading and applying.