酸性水汽提装置双相钢管线腐蚀失效分析与防护措施  

Corrosion Failure Analysis and Protection Measures of Erosion Corrosion Pipe in Acid Water Vapor Extraction Unit

作　　者：陈泰劭 范桂利 朱致远 Chen Taishao;Fan Guili;Zhu Zhiyuan(CNOOC Huizhou Petrochemical Co,Ltd,Huizhou,Guangdong 516086,China;CNOOC Changzhou Paint and Coatings Industry Research Institute Co,Ltd,Changzhou,Jiangsu 213000,China)

机构地区：[1]中海油惠州石化有限公司,广东惠州516086 [2]中海油常州涂料化工研究院有限公司,江苏常州213000

出　　处：《涂层与防护》2024年第4期19-22,23-28,共10页Coating and Protection

摘　　要：近年来,石油化工行业大力推进节能保温技术在管线上的应用,取得了显著的节能效果,但同时也给管线埋下了安全隐患。随着管线服役时间的增加,保温层下腐蚀造成的泄漏事故逐渐增多。本研究以国内某石化公司煤制氢部酸性水汽提装置管线腐蚀的典型案例为研究对象,通过对过滤器出口压力远传引压排气双相钢2205小接管腐蚀原因调查、宏观、低倍分析、材质分析、金相检验、电镜分析、保温材料成分等多项理化检验分析,认为该小接管开裂是因为保温层下腐蚀(CUI),腐蚀形成的蚀坑或腐蚀产物层下沉积的腐蚀性离子造成应力腐蚀开裂,根据结论,采取了一系列保温层下腐蚀的防护措施,为同类企业防范CUI管控提供参考。In recent years,the petrochemical industry has vigorously promoted the application of energy-saving and thermal insulation technology in pipelines,which has achieved remarkable energy-saving effects,but at the same time,it has also buried security risks for pipelines.With the increase of pipeline service time,the leakage accidents caused by corrosion under insulation(CUI)layer gradually increase.In this paper,a typical case of pipeline corrosion in the acid water vapor extraction unit of the coal to hydrogen department of a domestic petrochemical company is taken as the research object.Through the investigation of the corrosion causes of filter outlet pressure remote transmission pressure exhaust dual-phase steel 2205 small nozzle,macro-analysis,low-power analysis,material analysis,metallographic inspection,electron microscope analysis,thermal insulation material composition and other physical and chemical analysis,It is considered that the cracking of the small nozzle is due to the CUI,and the corrosion pit formed by corrosion or the corrosive ions deposited under the corrosion product layer causes stress corrosion cracking.According to the conclusion,a series of protective measures for the corrosion under thermal insulation are taken to provide reference for similar enterprises to prevent CUI control.

关 键 词：酸性水汽提装置 双相钢2205 保温层下腐蚀 应力腐蚀开裂 

分 类 号：TQ630[化学工程—精细化工]