1000MW汽轮发电机组轴系多跨零试重动平衡技术应用分析

Application Analysis of Multi Span Zero Test Weight Dynamic Balancing Technology for 1000MW Turbogenerator Shafting

随着我国电力装备制造水平及高速平衡技术的快速发展,近年来新投产的大型汽轮发电机组振动故障率呈现快速下降趋势。受实验条件限制,以三大动力为代表的制造厂商在汽轮发电机组转子出厂前只对单转子进行动平衡,而汽轮发电机组的轴系实际工作状态为多转子刚性连接,多支撑同步承担的多转子高速旋转轴系。受支撑刚度和连接刚度的影响,部分转子的原动态响应特性发生变化,加之残余不平衡响应的耦合,导致若干机组在试运期间相继发生轴系多跨振动超标故障。以一台1000MW汽轮发电机组多跨轴系振动故障处理为例,从轴系布置形式、振动机理、平衡策略等方面进行论述,归纳提出多跨零试重动平衡技术,为类似故障的诊断与分析提供参考。

With the rapid development of our country's electric power equipment manufacturing level and high-speed balance technology,the vibration failure rate of large steam turbine electric generator newly put into operation shows a fast declining trend in recent years.Limited by the experimental conditions,the manufacturers represented by the three power electric generator only balance the single rotor before the turbine rotor leaves the factory,while the actual working state of the turbine electric generator shafting is multi-rotor rigid connection,multi-support synchronous bearing high-speed multi-rotor rotating shaft system.Under the influence of the bracing stiffness and the connecting stiffness,the original dynamic response characteristics of some rotors change,and the coupling of the residual unbalance response occurs,many shafting multi-span vibration faults occurred one after another during commissioning.Taking the treatment of vibration fault of a multi-span shafting of a 1000MW steam turbine electric generator as an example,this paper discusses the shafting arrangement,vibration mechanism,balancing strategy,etc.,it provides reference for similar fault diagnosis and analysis.