摘要
采用金相显微镜、XRD、SEM和EDS等观察分析手段对脱硫再生塔塔底重沸器管束的腐蚀原因进行了分析。结果表明:重沸器管束穿孔部位表面呈现大量蜂窝状腐蚀坑形貌,存在大量S、Cl等腐蚀元素,腐蚀产物主要为FeS_2、FeS的混合物。腐蚀失效主要是由于原料中的H_2S、CO_2以及Cl^-等酸性介质构成RNH_2-H_2S-Cl^-热稳定性盐及H_2O体系的腐蚀和气泡腐蚀所致。并针对失效原因,提出了改进措施和建议。
The corrosion failure cause of reboiler tubes of a desulfurization regeneration tower in a refinery was investigated by microscopy, XRD, SEM and EDS. The results show that there existed a number of cellular corrosion pits at the surface of puncture site of the reboiler tubes , consisting of a lot of S , Cl and other corrosion elements. Tcomposed of FeSg and FeS. The corrosion failure of the reboiler tubes was mainly caused by corrosion of the RNH - H2S - Cl - Thermal stable salts - HOsystem made up of the acidic materials of HS , CO2 and Cl in raw material, and bubble corrosion. Finally, some measures and suggestions were put forward according to the failure cause.
出处
《失效分析与预防》
2016年第3期172-175,共4页
Failure Analysis and Prevention
关键词
再生塔
重沸器
腐蚀失效
气泡腐蚀
N-甲基二乙醇胺
regeneration tower
reboiler
corrosion failure
bubble corrosion
N-methyldiethanolamine
