1000 MW汽轮机汽流激振的故障分析及处理

针对东汽1 000 MW汽轮机在现场屡屡出现的高压转子汽流激振故障,进行振动的特征及机理分析,指出汽流激振力主要来源于密封激振力、叶顶间隙激振力和静态汽流力,并据此提出改变汽封迸汽的预旋方向、提高轴承稳定性裕度和调整高压调阀开启顺序等措施,消除或减缓高压转子的汽流激振,同时给出了相应的工程实例,为类似振动故障的处理提供参考.

Analyzing and Troubleshooting the Steam-Flow Exciting Vibration Fault for 1 000-MW Unit

The vibration characteristics and mechanisms are studied to address the issue of high-pressure rotor steam-flow exciting vibration which has been occurring frequently in the 1 000-MW steam turbines manufactured by DFSTW. Through the study, it is discovered that the steam excitation force mainly comes from the sealing force, tip clearance exciting force and static steam force. Therefore, corresponding measures such as changing the perspiring direction of inlet steam flows in the seal, improving the stability of bearings and optimizing the sequence of high-pressure valve opening on the spot are put forward for elimination or alleviation of the exciting vibration. At the same time, the actual engineering cases are provided for troubleshooting similar vibration faults.