摘要
针对某300 MW机组运行中高中压转子振动爬升问题,通过分析冷态和热(温)态转子振动特性差异和转子弯曲量的减小等异常情况,诊断振动故障源于转子存在裂纹,热态下导致转轴刚度的降低和平衡状态的恶化。抽转子探伤检查发现转轴确实出现严重的裂纹,证实了诊断结论的准确性。及时停机检查和发现裂纹避免了机组继续运行可能发生的断轴毁机灾难性事故。文章还分析了该转子裂纹的产生过程以及对火电机组深度调峰和灵活性运行可能对转子安全性产生的影响。
Aiming at the problem of vibration climbing of the high-medium pressure rotor during the operation of a 300-MW unit, this paper analyzes the abnormal situations such as the differences in vibration characteristics of the rotor between cold and hot （warm） states and the decrease in rotor bending and concludes that the vibration problems are caused by the cracks in the rotor, which lead to the decrease of the rotor stiffness in the hot state and the damage of the rotor balance. The rotor detection shows that there are severe cracks in the rotor shaft. The detection confirms the accuracy of the diagnosis. The timely shutdown and maintenance as well as the detection of the existence of the cracks, have prevented the unit from potential shaft break and collapse. Moreover, the producing process of the rotor cracks and the possible impacts of in-depth peaking load and flexible operation of thermal power units on the rotor safety are also studied in this paper.
出处
《中国电力》
CSCD
北大核心
2017年第5期13-19,共7页
Electric Power
关键词
火力发电机组
高中压转子
异常振动
故障诊断
转子裂纹
thermal power generation unit
high-medium pressure rotor
abnormal vibration
fault diagnosis
rotor crack
作者简介
张学延（1962-），男，重庆人，研究员，长期从事汽轮发电机组振动故障诊断和治理工作。E—mail：zhangxueyan@tpri．com．cn
