热力发电2024，Vol.53Issue(10)：106-113,8.DOI:10.19666/j.rlfd.202403060
面向新型电力系统汽轮机高压转子蠕变/疲劳寿命损耗研究
Research on creep/fatigue life of high pressure rotor in steam turbine for new power systems
摘要
Abstract
Under deep peak shaving and variable operating conditions of thermal power units,significant changes in steam temperature have caused a significant increase in thermal stress in some structures of the units,which accelerated structural damage,and resulted in frequent safety accidents.To solve these problems,by taking the regulating stage rotor of a 300 MW steam turbine as the object,and Ansys software is used to analyze the thermal stress,aerodynamic force,and centrifugal force of the blades.Firstly,structural optimization is carried out on root of the blade to significantly eliminate the unreasonable local stress concentration phenomenon commonly found in conventional calculations.Then,the distribution laws of temperature and stress fields in the regulating stage under different conditions such as steady-state and transient during the deep peak shaving process of thermal power units are revealed.Moreover,the effects of the temperature and stress fields on safety performance of the unit are also investigated.The results indicate that,the maximum equivalent stress increases by about 24%under steady-state conditions with temperature difference of different nozzle groups of 50℃.The transient load increase rate of 5%THA/min is about three times higher than that of 2%THA/min,causing low cycle fatigue damage to the rotor.Compared with steady-state operating conditions,increasing the load once a day at a rate of 2%THA/min from half load to full load increases the overall damage by about 38%.关键词
深度调峰/调节级/汽轮机转子/热应力/蠕变疲劳Key words
deep peak shaving/regulating stage/steam turbine rotor/thermal stress/creep and fatigue引用本文复制引用
陈思远,黄畅,王卫良,吕俊复,柯希玮,刘志东,马庆中..面向新型电力系统汽轮机高压转子蠕变/疲劳寿命损耗研究[J].热力发电,2024,53(10):106-113,8.基金项目
珠海市产学研合作项目(2220004003010) （2220004003010）
中央高校基本科研业务费专项资金资助(21622420) Zhuhai Industry-University-Research Cooperation Project(2220004003010) （21622420）
Fundamental Research Funds for the Central Universities(21622420) （21622420）
