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Rotordynamic Stability Under Partial Admission Conditions in a Large Power Steam Turbine

[+] Author Affiliations
Lin Gao, Yiping Dai

Xi’an Jiaotong University, Xi’an, Shaanxi, China

Zhiqiang Wang

Harbin Marine Boiler & Turbine Research Institute, Harbin, Heilongjiang, China

Yatao Xu

Beijing Guohua Electric Power Technology Research Center, Beijing, China

Qingzhong Ma

Shanxi Electric Power Research Institute, Taiyuan, Shanxi, China

Paper No. GT2009-59467, pp. 795-802; 8 pages
doi:10.1115/GT2009-59467
From:
  • ASME Turbo Expo 2009: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Orlando, Florida, USA, June 8–12, 2009
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4887-6 | eISBN: 978-0-7918-3849-5
  • Copyright © 2009 by ASME

abstract

At present, the majority of power steam turbines operate under part-load conditions during most of their working time in accordance with the fluctuation of power supply. The load governing method may cause partial admission in control stage and even some pressure stages, which impacts much on the stability of the rotor system. In this paper, CFD and FEM method were used to analyze the effect of partial admission on rotor system stability. A new approach is proposed to simplify the 3D fluid model for a partial admission control stage. Rotordynamic analysis was carried out to test the stability of the HP rotor of a 600 MW steam turbine under different load conditions. 13 different governing modes on the rotor stability were conducted and data were analyzed. It is found that rotor stability varies significantly with different governing modes and mass flow rates, which is consistent with the operation. Asymmetric fluid forces resulted from partial admission cause a fluctuation of the dynamic characteristics of the HP bearings, which consequently affect the stability of the rotor system. One of the nozzle governing modes in which the diagonal valves open firstly is demonstrated as the optimal mode with the maximum system stability. The optimization has been applied to 16 power generation units in China and result in improved rotor stabilities.

Copyright © 2009 by ASME

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