摘要
介绍了氢精制装置临氢系统热电偶套管法兰腐蚀情况,分析确定了腐蚀类型为氯离子腐蚀。对案例中出现腐蚀部位的热电偶套管法兰进行了化学成分分析,发现其与设计材质不符。原料油中的总氯含量超标及工艺操作条件的影响是出现氯离子腐蚀的主要原因。重点介绍了防止氯离子腐蚀的对策及措施,确保易出现腐蚀部位的材质符合设计要求,提出了一些对策:设备安装正确;控制好原料油性质各项指标在设计范围内;加强上游装置的进料预处理;严格操作条件,减少参数波动,避免氯离子局部聚集;通过采用连续注水和水洗等措施来降低氯离子腐蚀几率等。
The corrosion of conduit of thermocouple in the hydrogen system of hydrofining unit was introduced, and the corrosion was determined to be the corrosion of chlorine ion by ana｜ysis. The chemical composition analysis of conduit of thermocouples in corrosion location found that the material applied was different from that of design. The main causes of chlorine ion corrosion were excessive total chlorine in feed oil and operating conditions. The measures to control chlorine ion corrosion and ensure the material in location subject to corrosion meet the design requirement were proposed, such as good installation of equipment, good control of feedstock properties within design specifications, good treatment of feedstock of upstream units, strict operating conditions, reduction of operating parameter fluctuations, minimization of local accumulation of chlorine ions and application of continuous injection of water and application of water washing, etc to reduce chlorine ion corrosion.
出处
《石油化工腐蚀与防护》
CAS
2013年第1期27-30,共4页
Corrosion & Protection In Petrochemical Industry
关键词
加氢精制
氯离子
腐蚀
法兰
hydrofining
chlorine ion
corrosion
flange
