吴永法
WU Yongfa

• 1:浙江浙能绍兴滨海热电有限责任公司

摘要(Abstract)：

某热电公司国产300 MW燃煤汽轮发电机组在首次大修时发现汽轮机调节级动叶片铆接式围带上有1处贯穿性裂纹,通过对裂纹部位的宏观、微观、化学成分、力学性能、金相组织等进行检查和分析,认为裂纹产生的原因是围带在铆接时装配工艺不良,围带悬臂端铆接压紧力不足,在机组运行时,围带悬臂端产生振动导致围带开孔与铆钉接触部位产生磨损疲劳裂纹。给出的围带裂纹处理方案可为同类问题的处理提供借鉴。
A perfoliate crack was found at riveting shroud band of the governing stage moving blade of a domestic 300 MW steam turbine during the first overhaul. Through examination and analysis on macro morphology, microstructure, chemical composition and mechanical properties and metallurgical structure of the crack are conducted. The result shows that the failure is caused by improper riveting assembly process and insufficient riveting clamping force at the cantilever end. During the unit operation, vibration at the cantilever end causes fatigue crack at the interface between the rivet and open pore of the shroud band. The crack treatment scheme to the crack can be taken as reference for handling similar problems.

关键词(KeyWords)： 汽轮机;调节级;围带;裂纹
steam turbine;governing stage;shroud band;crack

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 吴永法
WU Yongfa

DOI: 10.19585/j.zjdl.2017.03.016

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