Analysis and treatment of vibration of 1000MW secondary reheat steam turbine with super-long single-support shafting

Abstract

In the context of new energy grid connection, thermal power units are gradually developing in the direction of large-scale and long-axis. However, due to the static deflection of the long shaft system, the rotor presents the shape of a lift curve during the installation process, which brings a huge challenge to the vibration stability of the rotor during operation. In addition, the shafting of the new million units in my country gradually takes the single support as the main support form, and the double support solution cannot be directly applied to the method of dealing with vibration excess. At the same time, there are few mature and complete technical solutions for reference in China. In this regard, this paper analyzes the vibration data and frequency spectrum of the generator during the commissioning of the No. 2 59.9 m ultra-long shafting unit in a factory, and finds that the vibration is caused by the thermal state generated by the generator rotor under load. unbalanced. Finally, after designing a targeted balance weight scheme and implementing it on site, the vibration of the generator bearing has reached an excellent level. This paper fills the vacancy of the vibration treatment of the ultra-long single-support shafting of the million-level units in China, and lays the foundation for the large-scale and long-shafted thermal power units.