In-service damage assessment and life prediction of stage 1 buckets in a frame 9E CCGT

V. Kalllanpur, Y. Yoshioka, J. Claeys, A. Beltran, H. Kashiwaya, K. Fujiyama, H. Tezuka, T. Sakurai, M. Aoki

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

In-service degradation of hot gas path components were evaluated for life extension purpose in a combined cycle power plant. In this paper only results for stage 1 bucket evaluation are discussed. The study included a detailed thermal and structural analysis of the hardware simulating typical operation of the TEPCO power plant, together with nondestructive and destructive examination of the parts condition at various hot gas path inspections. The analytic predictions of critical locations compared well versus actual, and the damage trends were tracked to quantify the damage evolution in the hardware. The destructive tests also verified temperature gradients based on γ microstructure measurements at near-surface, and internal locations. Microstructure and mechanical properties of the base metal and coating for the service exposed conditions were compared versus new buckets for baseline referencing. Also, the material properties for the service exposed condition were compared versus the original material assumptions used in the design of the original part, which also included approx. 60,000 hrs of uninterrupted creep testing. Knock down factors were established for the original materials design data in order to establish the life extension capability, and design margin beyond its specified original design life. Life extension capability was determined using cumulative damage considerations along with the thermal-mechanical stress and strain predictions and adjusted materials properties, both of which were unique for TEPCO's operating profile.

本文言語English
ホスト出版物のタイトルHeat Transfer; Electric Power; Industrial and Cogeneration
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9780791878606
DOI
出版ステータスPublished - 1999
外部発表はい
イベントASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1999 - Indianapolis, United States
継続期間: 1999 6月 71999 6月 10

出版物シリーズ

名前Proceedings of the ASME Turbo Expo
3

Other

OtherASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1999
国/地域United States
CityIndianapolis
Period99/6/799/6/10

ASJC Scopus subject areas

  • 工学(全般)

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