高流速强湍流下关键因素对环烷酸腐蚀的影响行为研究  

Influence of the Key Factors of Naphthenic Acid Corrosion under High Flow Rate and Strong Turbulence

作　　者：饶思贤[1,2] 华晓春 赵新生 郭祥钦 赵丽 王孝义[1] RAO Sixian;HUA Xiaochun;ZHAO Xinsheng;GUO Xiangqin;ZHAO Li;WANG Xiaoyi(School of Mechanical Engineering,Anhui University of Technology,Ma’anshan 243032;National Engineering Technical Research Center on PVP Safety,Hefei General Machinery Research Institute,Hefei 230031)

机构地区：[1]安徽工业大学机械工程学院,马鞍山243032 [2]合肥通用机械研究院国家压力容器与管道安全工程技术中心,合肥230031

出　　处：《机械工程学报》2023年第16期204-212,共9页Journal of Mechanical Engineering

基　　金：国家科技部国家高技术研究发展计划(2012AA040103);安徽省科技厅自然科学基金面上(1908085ME148);安徽省教育厅自然科学重大研究(KJ2016SD09)资助项目。

摘　　要：加工劣质高酸原油时炼油装置中存在较严重的环烷酸腐蚀,为保障炼油装置的安全性需要明确关键影响因素对环烷酸腐蚀的影响规律,从而实现准确的腐蚀预测或寿命评估。针对温度、活性硫化物含量、流速、冲刷角、湍流强度等关键因素对环烷酸腐蚀影响规律进行研究,确定腐蚀速率与温度之间的量化关系;引入硫化物含量对环烷酸腐蚀速率的等温线评价;明确环烷酸腐蚀存在由0°冲刷角下均匀腐蚀向高冲刷角下局部点蚀的转化,在0°冲刷角下流速可明显提高环烷酸腐蚀速率,但不改变均匀腐蚀形态,当冲刷角达到15°时即可出现点蚀,当冲刷角达到90°时,环烷酸腐蚀转化为点蚀为主,且点蚀最大腐蚀深度与局部湍流强度密切相关,高湍流强度下点蚀更为严重。Serious naphthenic acid corrosion existed during inferior high acid crude oil refining.The influencing rules of the key factors on naphthenic acid corrosion should be confirmed to achieve the goal of precise corrosion predication or lifetime assessment to ensure the safety of crude oil refining equipments.The influence of key factors such as temperature,content of active sulfides,flow rate,flushing angle and turbulence intensity on naphthenic acid corrosion is studied,the relationship between temperature and corrosion rate is confirmed and the isothermal assessment of active sulfides on napthenic acid corrosion is introduced;the transformation from uniform corrosion at 0°flushing angle to pitting corrosion at high flushing angles is clarified,the increase of flow rate could accelerate naphthenic acid corrosion but could not change its uniform corrosion mode,when the flushing angle is increased to 15°,small corrosion pits formed,when the flushing angle is increased to 90°,naphthenic acid corrosion transformed to pitting corrosion,the maximum corrosion depth of corrosion pits is closely related with local turbulence intensity,naphthenic acid pitting corrosion became more serious under high turbulence intensity.

关 键 词：环烷酸腐蚀 硫化物含量 流速 冲刷角 湍流强度 

分 类 号：TG172[金属学及工艺—金属表面处理]