Journal of the Optical Society of Korea

  • 제20권6호
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  • Pages.770-777
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  • 2016
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  • 1226-4776(pISSN)
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  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
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Methods and Systems for High-temperature Strain Measurement of the Main Steam Pipe of a Boiler of a Power Plant While in Service

  • Guang, Chen (Beijing Jiaotong University) ;
  • Qibo, Feng (Beijing Jiaotong University) ;
  • Keqin, Ding (China Special Equipment Inspection and Research Institute)
  • 투고 : 2016.07.12
  • 심사 : 2016.11.23
  • 발행 : 2016.12.25
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초록

It has been a challenge for researchers to accurately measure high temperature creep strain online without damaging the mechanical properties of the pipe surface. To this end, a noncontact method for measuring high temperature strain of a main steam pipe based on digital image correlation was proposed, and a system for monitoring of high temperature strain was designed and developed. Wavelet thresholding was used for denoising measurement data. The sub-pixel displacement search algorithm with curved surface fitting was improved to increase measurement accuracy. A field test was carried out to investigate the designed monitoring system of high temperature strain. The measuring error was less than $0.4ppm/^{\circ}C$, which meets actual measurement requirements for engineering. Our findings provide a new way to monitor creep damage of the main steam pipe of a boiler of an ultra-supercritical power plant in service.

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피인용 문헌

  1. Fuzzy-PID controller based on variable universe for main steam temperature system vol.15, pp.1-2, 2018, https://doi.org/10.1080/1448837X.2018.1490163