为了解决某型1 000 MW汽轮机高压转子振动不稳定问题,试验研究了转子振动规律,采用有限元方法建立高压转子-轴承系统动力学模型,计算分析了振动影响因素。结果表明,受振动受高压缸两侧主汽温偏差的影响较大。检修初期振动比较稳定,运行一段时间后波动幅度增大。主汽温偏差会改变转子和汽缸的同心度,产生不均衡汽流力作用到转子上,改变轴承载荷,进而影响振动。减小轴承两侧安装间隙容易导致乌金磨损。轴承磨损后,轴承刚度减小,不均衡汽流力对振动的影响增大,不平衡响应最大振动部位向#1轴承侧移动,振动突出表现在#1轴承。采取减小主汽温偏差、防止轴承乌金偏磨,减小轴承间隙等措施,取得了较好的减振效果。

In order to solve the unstable vibration of the high-pressure rotor of a 1000 MW steam turbine, the vibration rule of the rotor was experimentally studied. A dynamic model of the high-pressure rotor bearing system was established using finite element method, and the influencing factors of vibration were calculated and analyzed. The results indicate that the vibration is greatly affected by the steam temperature deviation on both sides of the high-pressure cylinder.After the maintenance, the vibration was relatively stable. But after running for a period of time, the vibration fluctuations increased. The deviation of the steam temperature can change the concentricity of the rotor and cylinder, resulting in uneven force acting on the rotor, changing the bearing load, and thus affecting vibration. Reducing the installation clearance on both sides of the bearing can easily lead to babbitt wear. After bearing wear, the bearing stiffness decreases, and the influence of the uneven force increases. The maximum vibration node of the unbalanced response moves towards the side of the # 1 bearing, and the vibration is prominent in the bearing. The following measures have been taken, including reducing the steam temperature deviation, bearing clearance and preventing bearing babbitt wear. The above measures have achieved good vibration reduction effects.

TH113.1

国家能源集团科学技术研究院有限公司科技项目(WH2023Y02)