高温蒸汽管道支管焊缝应力与模态特性研究  

Weld stress and modal characteristics of branch pipe of high temperature steam pipe

作　　者：刘福广[1] 杨二娟[1] 李勇[1] 米紫昊[1] 王艳松 韩天鹏 董会[2] 张磊 董鹏 LIU Fuguang;YANG Erjuan;LI Yong;MI Zihao;WANG Yansong;HAN Tianpeng;DONG Hui;ZHANG Lei;DONG Peng(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Xi’an Key Laboratory of High Performance Oil and Gas Field Materials,School of Material Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China;Huaneng Yimin Coal and Electricity Co.,Ltd.,Hulunbuir 021130,China;National Energy Group Jiaozuo Power Plant Co.,Ltd.,Jiaozuo 454351,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]西安石油大学材料科学与工程学院,西安市高性能油气田材料重点实验室,陕西西安710065 [3]华能伊敏煤电有限责任公司伊敏电厂,内蒙古呼伦贝尔021130 [4]国家能源集团焦作电厂有限公司,河南焦作454351

出　　处：《热力发电》2021年第7期125-129,共5页Thermal Power Generation

基　　金：陕西省自然科学基础研究计划项目(2020JM-540)。

摘　　要：基于高温蒸汽管道与支管尺寸,以温度套管为例建立模型,分析计算了通孔型套管、台阶型套管及结构优化温度套管3种不同结构、材质的温度套管焊缝焊趾处应力与振动模态。结果表明,通孔型套管与台阶型套管结构焊缝焊趾内部整体应力水平相近,均高于结构优化后温度套管,且结构优化温度套管发生疲劳断裂的风险大幅降低;3种结构焊缝焊趾的最高应力均分布在蒸汽主管(母管)圆周最高点,裂纹最易在该处萌生,应力水平以该处为基点成对称分布。结构优化温度套管对母管振动的响应程度较低。因此,支管的结构与材质优化可以减弱母管振动诱发的焊缝振动。Based on the dimensions of high-temperature steam pipe and branch pipe,the temperature casing is taken as an example to establish the model,and the stress and vibration modes at weld toe of the temperature casing with three different structures and materials,namely,the through-hole casing,the step casing and the structure optimized temperature casing,are analyzed.The results show that,the internal overall stress level of weld toe of the throughhole casing and the step casing is similar,which is higher than that in the structure optimized temperature casing.The risk of fatigue fracture of the structure optimized temperature casing is greatly reduced.The maximum stress of weld toes of the three structures is distributed at the highest point of the circumference of the steam main pipe(main pipe),where the crack is most likely to initiate,and the stress level is symmetrically distributed based on this point.The structure optimized temperature casing has a low response degree to the vibration of the main pipe.Therefore,optimization of the structure and material of the branch pipe can reduce the weld vibration induced by the parent pipe vibration.

关 键 词：高温蒸汽管道 振动 支管 焊缝 焊趾 应力 模态分析 

分 类 号：TH49[机械工程—机械制造及自动化]