偏心异径管下游管道流动加速腐蚀数值模拟研究  

Numerical Simulation Study on Flow-Accelerated Corrosion of Downstream Pipeline in Eccentric Reducer

作　　者：马建平 程俊杰 陶鑫 司晓东 董云山 MA Jianping;CHENG Junjie;TAO Xin;SI Xiaodong;DONG Yunshan(Ningxia Jingneng Ningdong Power Generation Co.,Ltd.,Yinchuan 751400,China;School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]宁夏京能宁东发电有限责任公司,宁夏银川751400 [2]江苏科技大学能源与动力学院,江苏镇江212100

出　　处：《绿色矿冶》2024年第3期99-104,共6页Sustainable Mining and Metallurgy

基　　金：江苏省双创博士项目(JSSCBS20210994),江苏省高等学校基础科学(自然科学)研究面上项目(23KJB430015);中国博士后科学基金(2023M732564)。

摘　　要：偏心异径管是电力、石油、化工等工业管道系统中常见的构件之一,其内部流动受到管径变化的影响,容易出现流动加速腐蚀问题。本文基于计算流体力学模拟,研究了偏心异径管在不同孔径比(ε=0.4~0.7)和不同速率(1~7 m/s)下的流体动力学特征,并结合Sanche z-Caldera模型分析了偏心异径管下游管道流动加速腐蚀速率分布特征。结果表明,偏心异径管下游易失效位置位于小孔径侧;在入口流速3 m/s条件下,随着孔径比增大,偏心异径管下游管道流动加速腐蚀敏感位置上移;在孔径比为0.6条件下,随着入口流速增大,流动加速腐蚀速率显著增大,流速变化对下游管道流动加速腐蚀敏感位置无影响。The eccentric reducer is one of the common components in industrial pipeline systems such as electricity,petroleum,and chemicals.The internal flow of eccentric reducers is influenced by changes in pipe diameter,which can lead to issues with flow-accelerated corrosion.Based on computational fluid dynamics simulation,the fluid dynamic characteristics of eccentric reducers at different aperture ratios(ε=0.4~0.7)and velocities(1~7 m/s)were investigated.The Sanchez-Caldera model was used to analyze the distribution of flow acceleration corrosion rates in downstream pipelines of eccentric reducers.The results show that the location prone to failure in the downstream of eccentric reducers is on the side with the small aperture.Under the condition of inlet flow rate of 3 m/s,as the ratio increases,the sensitive position for flow acceleration corrosion in downstream pipelines moves upwards.Under the condition of pore size ratio of 0.6,the flow accelerated corrosion rate increases significantly with the increase of inlet flow rate,changes in flow velocity have no effect on the sensitive position for flow-acceleration corrosion in downstream pipelines.

关 键 词：偏心异径管 传质系数 流动加速腐蚀 数值模拟 

分 类 号：TG174[金属学及工艺—金属表面处理]