加氢装置脱硫化氢汽提塔的腐蚀与对策  

Corrosion of H_(2)S stripper in hydrogenation unit and its countermeasures

作　　者：孙开俊[1] 庄强 SUN Kaijun;ZHUANG Qiang(SINOPEC Yangzi Petrochemical Company Limited,Nanjing 210048,China)

机构地区：[1]中国石化扬子石油化工有限公司,江苏南京210048

出　　处：《石油化工腐蚀与防护》2022年第4期21-24,共4页Corrosion & Protection In Petrochemical Industry

基　　金：中国石化科技开发项目“双超加氢反应器在200万吨/年渣油加氢装置上的应用”(10GKC008)。

摘　　要：脱硫化氢汽提塔是加氢装置分馏单元腐蚀性介质含量最高、腐蚀问题最为严重的设备。某石化公司因原料变化对硫化氢汽提塔的进料段进行设计调整,运行一个周期后发现进料段第5至8层区域筒体和内构件发生严重腐蚀。通过观察腐蚀形貌、腐蚀风险评估,结合工艺运行参数及露点温度核算,认为硫化氢汽提塔进料段附近区域腐蚀为汽蚀和高温H_(2)S/H_(2)腐蚀,且因改造后材质未能同步升级等因素所致。提出了材质升级、进料分布结构优化和工艺运行调整等改进措施,可减缓腐蚀发生。H_(2)S stripper is the equipment with the highest content of corrosive medium and the most serious corrosion problem in the fractionation system of hydrogenation unit.In a petrochemical company,the design of the feed section of H_(2)S stripper was adjusted due to the change of raw materials.After one cycle of operation,it was found the cylinder and internals in the 5th to 8th layers of the feed section were severely corroded.Based on the corrosion morphology observation and corrosion risk assessment,combined with process operation parameters and dew point temperature calculation,it was considered the corrosion in the area near the feed section was cavitation corrosion and high-temperature H_(2)S/H_(2) corrosion,which was caused by the failure to upgrade the material synchronously after the transformation.Finally,the improvement measures such as material upgrading,feed distribution structure optimization,and process operation adjustment were raised to prevent the corrosion.

关 键 词：加氢装置 脱硫化氢汽提塔 腐蚀分析 汽蚀 防腐蚀措施 

分 类 号：TE986[石油与天然气工程—石油机械设备]