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电力大数据:2018,21(1):-
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超临界660MW汽轮机汽流激振的故障分析及处理
顾剑
(贵州金元茶园发电有限责任公司)
Analysis And Disposal With The Steam-flow Exciting Vibration Fault For 660MW Units
GU Jian
(Guizhou Jinyuan Chayuan Power Generation Co.,Ltd.)
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投稿时间:2018-01-12    修订日期:2018-01-22
中文摘要: 某超临界660MW汽轮机的高中压转子频繁发生振动跳变故障,频谱分析表明振动跳变主要表现为半频成分,且振动跳变与机组负荷关联密切,据此诊断故障原因为汽流激振。现场跟踪监测了不同负荷对应的轴承振动变化,对调门开度,主蒸汽参数进行各种优化调整,并对润滑油系统包括各道轴承的油膜压力、轴封汽系统、开展了细致的排查。通过对振动的特征及机理的进一步分析,指出汽流激振力主要来源于密封激振力和叶顶间隙激振力。随后对高压调阀全行程特性进行测试,研究了每一个调阀在全行程内的振动趋势,并依据试验结果对高压调阀的开启顺序进行调整,从几种阀序的实际试验情况中,找到最佳的高压调门开启顺序,成功消除了该振动故障,为类似振动故障的处理提供参考。
Abstract:The vibration frequent mutation of high and medium pressure rotors of a certain supercritical 660MW steam turbine occurred. The frequency spectrum analysis shows that the vibration mutation is mainly represented by the semi-frequency components, and the vibration mutation is closely related to the load of the unit. According to the vibration in different load, optimize the valve opening and the main stream parameters, examine the bearing oil film pressure and gland steam system, the cause of fault diagnosis is steam-flow exciting vibration. Through the further analysis of the characteristics and mechanism of the vibration, it is pointed out that the excitation force of the steam flow mainly comes from the exciting force of the seal and the gap between the top of the blade. Then, the full stroke characteristic of the high-pressure governing valve is tested, the vibration trend of every valve is studied in the whole trip, and the opening sequence of the high-pressure governing valve is adjusted according to the test results, from the actual situation of several test valve sequence, the optimal opening sequence of high pressure governing valve is found, and successfully eliminates the vibration fault, and provides reference for similar vibration failure processing.
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