高流速强湍流下低碳钢局部环烷酸腐蚀行为  

Localized Naphthenic Acid Corrosion of Carbon Steel Under High Flow Rate and Strong Turbulence

作　　者：张肖飞 马涛 华晓春 王孝义[1] 饶思贤[1,2] ZHANG Xiaofei;MA Tao;HUA Xiaochun;WANG Xiaoyi;RAO Sixian(School of Mechanical Engineering,AnHui University of Technology,Maanshan 243032,China;Hefei General Machinery Research Institute,Hefei 230031,China)

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,合肥230031

出　　处：《材料导报》2021年第14期14136-14141,共6页Materials Reports

基　　金：国家高技术研究发展计划(2012AA040103);安徽省自然科学研究项目(KJ2016SD09,1908085ME148)。

摘　　要：现如今加工劣质高酸原油已成为趋势,但高酸原油炼制中存在显著的环烷酸腐蚀现象。为了明确高流速强湍流对环烷酸腐蚀的影响,开展了不同冲刷角下的环烷酸腐蚀试验,同时进行了不同冲刷角下的流速和湍流强度模拟。结果表明:在不同冲刷角(0~90°)下,试样表面存在显著的流场改变,局部存在流速加剧和显著的湍流现象;高流速强湍流下环烷酸腐蚀速率与不同冲刷角下形成的湍流场相关,整体上随着冲刷角的增大,最大腐蚀深度呈上升趋势,在冲刷角为90°时局部腐蚀深度增加显著;90°冲刷角下环烷酸腐蚀可由局部腐蚀形态转换为局部点蚀形态,点蚀萌生于优先腐蚀的珠光体,并在高流速、强湍流作用下扩展、合并为宏观碟形点蚀坑。Nowadays,it has become a trend to process inferior high-acid crude oil,but there is significant naphthenic acid corrosion in the refining of high-acid crude oil.In order to clarify the effect of high velocity and strong turbulence on naphthenic acid corrosion,naphthenic acid corrosion experiments were carried out under different scour angles,and the velocity and turbulence intensity simulations under different scour angles were also performed.The results show that under different scouring angles(0—90°)there are significant changes in the flow field on the surface of the sample,and the velocity increase and local turbulence are localized.The corrosion rate of naphthenic acid under high velocities and strong turbulence is related to the turbulence field formed in different scouring angles.As the scour angle increases,the maximum corrosion depth tends to increase.When the scouring angle is 90°,the local corrosion depth increases significantly.At 90°scouring angle,the naphthenic acid corrosion can be transformed from the localized corrosion form to local pitting morphology.Pitting corrosion originated from the preferentially corroded pearlite and expanded and merged into macro dish-shaped pitting pits under the action of high flow velocity and strong turbulence.

关 键 词：环烷酸腐蚀 湍流强度 湍流场 冲刷角 点蚀坑 

分 类 号：TE973[石油与天然气工程—石油机械设备]