摘要
本文介绍一起火电厂汽轮机在高压缸启动方式下进行汽轮机汽门严密性试验时,汽轮机发生窜轴、推力瓦损坏的事件。同时本文简述了汽轮机窜轴的过程,阐明了汽轮机窜轴的常见原因。对汽轮机汽门严密性试验前后汽轮机轴向推力进行了研究,指明本次汽轮机窜轴的原因是汽轮机高压缸排汽受阻,高压缸进汽流量剧增,汽轮机负轴向推力陡增所致。最后给出了汽轮机在高压缸启动方式下进行汽门严密性试验的建议,可为机组汽门严密性试验提供参考。
This paper presents an incident in which a thermal power plant's steam turbine experienced shaft displacement and thrust pad damage during a valve tightness test under the high-pressure(HP)cylinder start-up mode.The process of turbine shaft displacement is briefly described,and common causes of such displacement are explained.The axial thrust of the turbine before and after the valve tightness test is analyzed,indicating that the root cause of this incident was the blockage of HP cylinder exhaust flow,leading to a sharp increase in HP cylinder steam flow and a sudden surge in negative axial thrust.Finally,recommendations for conducting valve tightness tests under HP cylinder start-up conditions are provided,which may serve as a reference for similar tests on steam turbine units.
作者
许涛
徐万兵
黄辉
李阳海
周淼
刘俊
XU Tao;XU Wan-bing;HUANG Hui;LI Yang-hai;ZHOU Miao;LIU jun(Electric Power Research Institute,State grid Hubei Electric Power Co.,Ltd.,Wuhan 430077,China)
出处
《节能技术》
2025年第6期560-563,共4页
Energy Conservation Technology
关键词
高压缸启动
窜轴
轴向推力
推力瓦损坏
HP cylinder start-up
shaft displacement
axial thrust
thrust pad damage
