高压加氢装置热高分换热器管束腐蚀原因分析

Analysis of corrosion in tube bundle of heat exchanger of hot high-pressure separator in high-pressure hydrogenation unit

分析了中国石油克拉玛依石化公司润滑油高压加氢装置热高分油气/循环氢高压换热器不锈钢管束腐蚀泄漏的原因。通过宏观检测、涡流检测、材质分析、腐蚀产物分析等技术手段,认定由于在管束内形成NH4C l结晶,导致垢下腐蚀和紊流状态下的冲蚀。从技术上和管理上提出了应对措施,通过控制材质升级、工艺温度调整、增加工艺注水点等,确保了设备的长周期运行。

The causes of corrosion leakages in stainless steel tube bundles of high-pressure oil vapor/recycle gas heat exchanger of high-pressure lube oil hydrogenation unit of PetroChina Karamay Petrochemical Company are analyzed.The macro testing,eddy current testing,material analysis and corrosion products analysis,etc have confirmed that the under-deposit corrosion and impingement erosion under turbulent current are caused mainly by NH4Cl crystallization inside the tubes.Corresponding corrective measures have been proposed and applied in respect of technology and management,such as control of material upgrading,adjustment of process temperatures,addition of water injection points,etc,which have ensured the long-term operation of the equipment.