摘要
运用CFD方法对高压空冷器换热管束第三排失效位置进行了数值计算。分析了衬管尾部直角结构对管束失效的影响,结果表明,衬管尾部直角结构在流体下游诱发涡流,在距衬管尾部约75 mm处产生高壁面剪切应力(最大值达到13.1 Pa)区,冲刷作用加强;通过分析管内垢物的分布与流动状态的关系,发现垢物沿轴向分布的不均匀改变了管内流体的流速,在垢物层最厚位置之后形成高剪切应力区,极大地加强了冲刷作用。计算结果与第三排剖切的部分换热管腐蚀泄露位置基本吻合。
The numerical calculation based on CFD is performed on failure location in third row tubes of the high pressure air cooler bundle. The impact of the end structure of lining pipe on the failure of the bundle is analyzed. The results show that 90-degree end will causes vortex in fluid at backward position where the higher shearing force comes into being. A maximum wall shearing stress of 13, 1 Pa is produced 75 mm from the lining tube end. The analysis of the distribution of sediments in the tube and flow status of fluid has found that the ununiform distribution of sediments has changed the flow velocity in tubes and formed the highest shearing force area in backward position where the sediment is thickest, which greatly aggravates erosion corro- sion. The calculation results conform well to the failure position of the air cooler bundles.
出处
《炼油技术与工程》
CAS
北大核心
2008年第3期44-47,共4页
Petroleum Refinery Engineering
基金
中国石化股份有限公司资助项目(305057)。
关键词
高压空冷器
衬管
腐蚀
冲刷
失效
high-pressure air cooler, lining tube, corrosion, erosion, failure
