Abstract: The corrosion damage mechanism of heat exchanger in visbreaking unit was studied, through field morphology observation, scanning electron microscopy (SEM) micromorphology, energy spectrum analysis (EDS) and corrosion coupon experiments, and find out the naphthenic acid corrosion damage reason of the exchange tube heat exchanger and baffle plate, further analyzes the naphthenic acid corrosion mechanism of carbon steel; Then through a variety of material corrosion coupon experimental comparison, the anti⁃corrosion measures are put forward. The research results show that the corrosion of heat exchanger leakage and crude oil viscosity device, high acid value, the water content of the working temperature of heat exchanger and the material, dehydration of crude oil and reasonable change of the working temperature and material of the heat exchanger can effectively reduce the corrosion damage of the heat exchanger of the viscosity reducing device.

Key words: Visbreaking unit, Heat exchanger, Corrosion, Naphthenic acid, Corrosion bolt

摘要： 研究了减黏裂化装置换热器腐蚀破坏机理，通过现场形貌观察、扫描电子显微镜（SEM）微观形貌、能谱分析（EDS）及腐蚀挂片实验相结合的手段，找出了换热器内部换热管、折流板的环烷酸腐蚀破坏原因，进一步分析了环烷酸对碳钢的腐蚀原因；继而通过多种材料腐蚀挂片实验比对，提出了防腐措施。结果表明，减黏裂化装置换热器的腐蚀泄漏与原油的含水量、高酸值、换热器的工作温度及材质有关，对原油进行脱水处理、合理地改变换热器的工作温度和材质，能够有效地减少减黏裂化装置换热器的腐蚀破坏。

关键词: 减黏裂化装置, 换热器, 腐蚀, 环烷酸, 腐蚀挂片