In recent years, bowing of steam turbine rotor under long time service occurs in several high-parameter units. Collected data show that the bending of the haywire rotor is increasing continuously, which results in excessive vibration in operation and even causes over-limit vibration during start-up. In order to suppress the vibration, balancing is utilized in field with the traditional approach that the balancing mass is placed in the section of the rotor close to the bearing. However, the balancing with the traditional approach could only reduce the vibration temporarily. In the long time scale, the bowing is still propagating or even gets worse after the balancing. To determine the cause of bowing and form optimal balancing approach, analysis is carried out in this work including: (i) fault cause and its treatment of bowing of steam turbine rotor under long time service is studied with elastic–plastic mechanics and creep mechanism taken in account; (ii) a case study was carried out, where the bowing process was simulated and validated with the field monitoring data; (iii) the phenomenon of the traditional balancing method was illustrated with rotordynamics analysis, where the influence of whirling is included. Based on the analysis, the cause of bowing is determined as uneven creep effect. And the balancing method would influence the whirling mode, which would worsen bowing in the traditional balancing method. Based on this conclusion, an optimized balancing method was developed to reduce the vibration and prevent bowing propagation simultaneously.
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November 2015
Research-Article
Fault Analysis and Optimal Balancing of Bowing of Steam Turbine Rotor Under Long-Term Service
Jingming Chen,
Jingming Chen
1
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
e-mail: cjm10@mails.tsinghua.edu.cn
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University
,Beijing 100084
, China
e-mail: cjm10@mails.tsinghua.edu.cn
1Corresponding author.
Search for other works by this author on:
Dongxiang Jiang,
Dongxiang Jiang
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
e-mail: jiangdx@tshinghua.edu.cn
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University
, Beijing 100084
, China
e-mail: jiangdx@tshinghua.edu.cn
Search for other works by this author on:
Chao Liu
Chao Liu
Department of Mechanical Engineering,
e-mail: chaoliu13@tsinghua.edu.cn
Tsinghua University
,Beijing 100084
, China
e-mail: chaoliu13@tsinghua.edu.cn
Search for other works by this author on:
Jingming Chen
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
e-mail: cjm10@mails.tsinghua.edu.cn
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University
,Beijing 100084
, China
e-mail: cjm10@mails.tsinghua.edu.cn
Dongxiang Jiang
State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
e-mail: jiangdx@tshinghua.edu.cn
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University
, Beijing 100084
, China
e-mail: jiangdx@tshinghua.edu.cn
Chao Liu
Department of Mechanical Engineering,
e-mail: chaoliu13@tsinghua.edu.cn
Tsinghua University
,Beijing 100084
, China
e-mail: chaoliu13@tsinghua.edu.cn
1Corresponding author.
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 2, 2015; final manuscript received March 16, 2015; published online May 12, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Nov 2015, 137(11): 112503 (10 pages)
Published Online: November 1, 2015
Article history
Received:
February 2, 2015
Revision Received:
March 16, 2015
Online:
May 12, 2015
Citation
Chen, J., Jiang, D., and Liu, C. (November 1, 2015). "Fault Analysis and Optimal Balancing of Bowing of Steam Turbine Rotor Under Long-Term Service." ASME. J. Eng. Gas Turbines Power. November 2015; 137(11): 112503. https://doi.org/10.1115/1.4030279
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