大功率汽轮机配汽方式对轴系稳定性的影响

电网负荷的波动，使得大功率机组参与调峰运行成为必然。部分负荷工况汽轮机的调节配汽特性不仅影响机组运行的经济性，而且直接影响机组轴系的稳定性。该文采用流固耦合分析方法，以某600 MW亚临界机组为对象，对机组部分负荷工况时轴系在气流力作用下的稳定性进行了研究，揭示了机组单阀切换为顺序阀运行时轴系稳定性恶化的机理，提出了机组配汽特性的优化方案，并在机组的运行中得到了成功的应用，有效地改善了机组单阀切换为顺序阀运行时轴系的稳定性。

Effect of Steam Distribution Method on Large Steam Turbine Rotor Stability

Peak shaving operation of more and more large power steam turbines become necessary due to the load fluctuations. The characteristics of steam distribution system of a steam turbine under part-load conditions will affect not only the economy but also the rotor system stability of the unit. A fluid structure interaction method was used in this paper. The rotor system stability of a subcritical 600 MW steam turbine was studied under part-load conditions where unbalanced fluid force was considered. The mechanism of worsen stability of rotor system after turning to sequence valve mode was analyzed. An optimum mode of steam distribution system was proposed. The mode had been used for some practical turbine units and improved their stability of rotor systems. The research may help to improve the performance of the steam distribution system of a large power steam turbine.