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시간-온도 파라미터 방법에 의한 화력발전소 보일러용 9Cr강의 크리프 수명예측 방법에 관한 연구
현중섭(Jung-Seob Hyun),허재실(Jae-Sil Heo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Creep strength enhanced 9Cr Steels has been introduced for thermal power plant components such as boiler tubes and piping. Also, there are many creep rupture damages of boiler in thermal power plants recently. In order to increase accuracy of creep life estimation, it is important to calculate accurately constants of creep life estimation equations such as Larson-Miller Parameter(LMP), Manson-Haferd Parameter(MHP) etc. In this paper, NIMS creep rupture lives obtained by means of uniaxial creep test for 9Cr steels and predicted creep lives by 5 creep estimation parameters including LMP, MHP are presented comparatively. Also, various constatant values in LMP are discussed based on the data and minimum average errors. Finally, optimum constant value according to the temperature in LMP method for creep life estimation are founded. It is expected that this study will contribute to increase accuracy of creep life prediction for 9Cr steels, which could minimize creep rupture damages.
현중섭(Jung Seob Hyun),허재실(Jae Sil Heo),조선영(Sun Young Cho),허정열(Jeong Yeol Heo),이성기(Seong Kee Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
High temperature steam pipes of thermal power plant are subject to a severe thermal range and usually operates well into the creep range. Cyclic operation of the plant subjects the piping system to mechanical and thermal fatigue damages. Also, poor or malfunctional supports can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical piping system, various inspection methods such as visual inspection, computational analysis and on-line piping displacement monitoring were developed. 3-dimensional piping displacement monitoring system was developed with using the aluminum alloy rod and rotary encoder sensors, this system was installed and operated on the high temperature steam piping of "Y" thermal power plant successfully. It is expected that this study will contribute to the safety of piping system, which could minimize stress and extend the actual life of critical piping.
허재실(Heo Jae Sil),김태훈(Kim Tae Hoon),현중섭(Hyun Jung Seob) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Generally, 230,000 hours of power plant boiler, starting in 5,000 or 200,000 hours of turbines and has a design life. Driving more than 100,000 hours of performance and reliability over time and lifetime consumption rate decreased sharply in progress, so aging diagnosis of plant life through the critical equipment for soundness and comprehensive evaluation of the remaining life of the facility shall minimize the threat of stability. Currently the country in the early 1980s, many operations are still being built. Therefore, accurate diagnosis of life, and to assess the remaining life of equipment should ensure the soundness. In this study, the main facilities of domestic aged steam plant boilers, turbines and pipe against the non-destructive testing, material degradation testing, hardness testing, indentation and mechanical tests were performed. In addition, through this case in the future be extended to the domestic standard fossil power plants will contribute to ensure soundness.
최우성(Woo Sung Choi),송기욱(Gee Wook Song),김범신(Bum Shin Kim),현중섭(Jung Seob Hyun),허재실(Jae Sil Heo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
최근 들어 화력발전소는 잦은 기동과 부하 변동 하에서 안정적인 운전 및 관리에 대한 요구가 높아지고 있다. 특히 터빈, 보일러와 같이 고온 고압의 조건에서 운전되는 발전 설비의 경우 크리프 및 피로 손상의 영향으로 설비의 수명이 감소하게 된다. 보다 안전한 발전소 운영을 위해 설비의 정확한 수명평가가 중요하며 현재까지 다양한 방법이 개발되어 적용되고 있다. 그러나 현재까지는 표준화된 가이드라인이나 절차 없이 정성적/준정량적 분석에 의해 주요 설비의 수명을 평가하고 있다. 본 연구에서는 크리프 및 피로 손상기구에 근거하여 국내 화력발전 주요 설비의 수명 소비율을 평가하는 표준화된 기준을 개발하였고 실제 설비에 적용하여 평가 기준의 활용성을 검증하였다. 본 기준은 2010 전력기술기준에 수록될 예정으로 수명평가의 정확성 향상과 수명관리 표준화에 기여할 것이다. Fossil power plants are requested to be more efficient and reliable for longer operation against frequent start-ups and load changes, recently. Major plant facilities such as turbine, boiler, in particular, may suffer from more severe creep and fatigue damage under high temperature and high pressure conditions. For more stable operation and maintenance, various technologies have been developed that provide a systematic approach to life assessment of critical facilities. However, until now, to evaluate remaining life of major facilities of fossil power plant, qualitative / semiquantitative analysis is carried out without standard guideline or procedure in Korea. In this study, the standard code for assessing the life consumption of major plant facilities is proposed based on creep and fatigue damage, generally accepted as dominant damage mechanisms of facilities. This code is planning to be included in KEPIC(Korea Electric Power Industry Code) in 2010.