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Oxide Layer Rumpling Control Technology for High Efficiency of Eco-Friendly Combined-Cycle Power Generation System

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Abstract

Combined-cycle power generation is a high-efficiency power generation method using natural gas that can reduce the emissions of carbon dioxide and other harmful substances by increasing the power generation efficiency. Therefore, the turbine inlet temperature should be increased to improve the power generation efficiency. However, given that the operating environment becomes extreme as the turbine inlet temperature increases, ensuring the sufficient durability of the gas turbine components is a necessity. Thermal barrier coatings (TBCs) applied to ensure the durability of the gas turbine components in a high temperature environment can peel off by stress generated through the difference in the thermal expansion coefficient of each layer. Because internal gas turbine components are damaged if peeling occurs, it is essential to ensure sufficient durability of the TBC. In particular, to enhance the efficiency of the combined-cycle power plant, and to withstand higher operating temperatures, it is essential to develop a TBC with an improved durability performance, when compared with currently commercialized TBCs. In this study, we attempted to improve the durability of the TBCs by mitigating the stress concentration phenomenon by gently controlling the rumpling of the oxide layer. For this purpose, the vertical crack design conditions required to reduce the buckling stress were derived through a finite element analysis. Isothermal degradation and thermal fatigue tests were conducted on the fabricated specimens to verify whether the oxide layer rumpling of the designed TBC was controlled gently and whether the durability was improved. Base on the results, a TBC structure with improved durability using oxide layer rumpling control technology is proposed.

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Acknowledgements

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIP) (No. 2015R1A2A1A10055230). This work was supported by the Human Resources Development program (No. 20174030201720) of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 16419, Gyeonggi, South Korea

    Hyunwoo Song, Jeong-Min Lee, Junghan Yun, Soo Park, Kyoung-Sup Kum, Young-Ze Lee & Chang-Sung Seok

  2. Railroad Type Approval Team, Korea Railroad Research Institute, 176, Cheoldobangmulgwan-ro, Uiwangi, 16105, Gyeonggi, South Korea

    Yongseok Kim

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  1. Hyunwoo Song
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  2. Jeong-Min Lee
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  3. Junghan Yun
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  4. Soo Park
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  5. Yongseok Kim
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  6. Kyoung-Sup Kum
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  8. Chang-Sung Seok
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Correspondence to Chang-Sung Seok.

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Song, H., Lee, JM., Yun, J. et al. Oxide Layer Rumpling Control Technology for High Efficiency of Eco-Friendly Combined-Cycle Power Generation System. Int. J. of Precis. Eng. and Manuf.-Green Tech. 7, 185–193 (2020). https://doi.org/10.1007/s40684-019-00116-2

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