西门子1 000 MW汽轮机组轴系碰磨故障特性研究

某西门子1 000 MW机组停机过程中，高压转子出现振动及其偏心值异常增大故障，存在高压转子发生永久弯曲的重大风险，严重威胁了机组的安全性。基于有限元法建立了轴系的动力学模型，分析了高压转子发生动静碰磨的动态响应，获得了高压转子发生碰磨的故障特征。采用数值仿真模拟了该型机组停机过程中高压转子的异常振动。研究结果表明，该机组停机过程中，高压转子振动及其偏心值异常增大的原因是端部汽封碰磨。通过开展高压缸径向间隙碰缸试验，调整高压转子与汽缸之间的径向间隙，解决了该问题，消除了高压转子可能发生永久弯曲的重大风险。

Theoretical Study and Experimental Research on Collision Fault of Shaft System of Siemens 1 000 MW Steam Turbine Unit

During the shutdown process of a Siemens 1 000 MW steam turbine unit, the vibration occurred at the high-pressure rotor with the abnormal increase of its eccentricity, which has imposed high risk of permanent bending in the high-pressure rotor and endangered the operation safety of the unit. In this paper, the dynamic model of the shafting of the unit is established by using the finite element method. Then, the dynamic response of the high-pressure rotor with respect to dynamic and static frictions is analyzed and the rubbing fault characteristics of the high-pressure rotor are obtained. In addition, the abnormal vibration of the high-pressure rotor during the shutdown process of the unit is numerically simulated. The research results show that the rubbing of the gland seal during the shutdown process of the unit is the major cause for the abnormalities of the high-pressure rotor. Through the radial clearance test to adjust the radial clearance between the high pressure rotor and the cylinder, the problem has been solved successfully. Therefore, the high risk of permanent bending of the high-pressure rotor is eliminated.