C_(3)/C_(4)分离装置脱丙烷塔底重沸器失效分析  

Failure Analysis of Bottom Reboiler of Depropanizer in C_(3)/C_(4)Separation Unit

作　　者：魏文 贺赢锋 孙媛媛 王波 Wei Wen;He Yingfeng;Sun Yuanyuan;Wang Bo(Zhejiang Petrochemical Co.,Ltd,Zhoushan,Zhejiang 316000,China)

机构地区：[1]浙江石油化工有限公司,浙江舟山316000

出　　处：《石油石化绿色低碳》2023年第2期64-67,73,共5页Green Petroleum & Petrochemicals

摘　　要：C_(3)/C_(4)分离装置投产运行一年,脱丙烷塔底重沸器传热能力迅速下降,热侧蒸汽调节阀及旁路全开,蒸汽量也只能达到正常时的60%,导致脱丙烷塔分离效果变差,产品异丁烷中丙烷含量超标。停工后对重沸器进行拆检分析,确定管束表面结垢致重沸器失效。通过对液化气携带液体及垢样进一步化验分析,得出结垢原因是原料中的一些组分发生反应产生硫酸亚铁、硫酸铝、氯化钙等,生产过程中形成硫酸酯或硫酸胺类物质导致重沸器换热效果大幅下降。针对这种情况,提出了降低操作压力和加强原料管理的措施,并建议通过增加原料净化设施和设备改型,彻底解决该问题。After one year since the C_(3)/C_(4)separation unit was put into operation,heat transfer capacity of the depropanizer bottom reboiler was found to drop rapidly,with hot steam regulating valve and bypass fully opening,and only 60%of the normal steam output,which resulted in poor separation of the depropanizer and excess propane content in iso-butane product.By checking the appearance and scale of the tubes in the reboiler during its overhaul,the scaling formation on the surface of the tubes was identified as the direct cause of the reboiler failure.Through further analysis of the liquid and scale sample carried by the LPG,it was concluded that the reason of scaling formation in the reboiler was the reactions of some components in feeds to produce ferrous sulfate,aluminum sulfate,calcium chloride,etc.,which were converted into sulfates or amines in the complex processes,leading to a dramatic decrease in heat exchange effect of the reboiler.In view of this situation,measures to reduce operating pressure and strengthen raw material management were proposed,and it was suggested to completely solve the problem by increasing raw material purification facilities and equipment modification.

关 键 词：液化气 重沸器 结垢 换热效果 

分 类 号：TQ053.5[化学工程]