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허재실(J.S. Heo),현중섭(J.S. Hyun),허정렬(J.R. Heo),이성기(S.K. Lee),조선영(S.Y. Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
High temperature steam pipes of fossil 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 mechanisms and poor or mal functional support assemblies can impose massive loads or stress onto the piping system. In order to prevent the serious damage and failure of the critical pipe 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 type sensors, this system was installed and operated on the Y fossil 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.
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.
화력발전소용 0.5Cr 0.5Mo 0.25V 강 곡관배관의 크리프 손상평가
현중섭(Jung Seob Hyun),허재실(Jae Sil Heo),김봉수(Bong Soo Kim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.3
Components in thermal power plants are subjected to service conditions under which creep damages take place causing material exhaustion. Comprehensive creep damage investigations have been performed on a 0.5Cr0.5Mo0.25V pipe bend which had been taken out of service after 117,603h and 501 start-ups because of severe cracks. The propagation of creep damage in a long term exposed pipe bend has been analysed by the replication, Indentation and hardness tests. Also, Calculation of creep lifetime has been investigated in order to verify actual lifetime of a damaged pipe bend. By measuring diametrical expansion, Accumulated creep strain and creep strain rate were calculated. Calculated results of creep lifetime on the Larson-Miller Parameter method are good agreement with actual service-exposed hour.
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.
배열회수보일러 핀(Fin)튜브 내면 검사 장치 개발 및 현장 적용에 관한 연구
서정석(J. S. Seo),정계조(G.-J. Jung),허재실(J. S. Heo),길두송(D. S. Gil) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
복합화력발전소의 배열회수보일러(Heat Recovery Steam Generator, HRSG) 핀(Fin)튜브는 내면의 다양한 손상 메커니즘에 의해 누설 고장이 빈번하게 발생하고 있다. 튜브 외면은 핀이 부착되어 있어 외부에서 육안 점검에 의한 손상 부위 판별이 어려워 실제 누설이 발생되기 전까지 적절한 검사 방법이 없는 실정이다. 현재 적용되고 있는 검사방법은 손상이 의심되는 튜브를 절단하고, 내시경을 사용하여 제한된 구간만 점검하는 비효율적 방법을 사용하고 있으며, 점검 범위와 기술의 한계점이 존재한다. 이를 극복하기 위해 한국전력공사 전력연구원에서는 내시경 검사법과 금속자기기억(Metal Magnetic Memory) 기술을 조합한 배열회수보일러 핀튜브 비파괴 검사 장치를 개발 하였다. 배열회수보일러 핀튜브 비파괴 검사 장치는 헤더내부에서 핀튜브로 로봇을 이송시켜주는 로봇셔틀(Robot Shuttle)과 헤더 내부로 삽입하는 검사센서 2 가지로 이루어져있다. 헤더 내부로 로봇셔틀이 진입하게 되면 헤더 내 센터링을 통하여 핀튜브 내부로 검사 센서가 진입하게 된다. 검사센서가 튜브 내부로 들어가게 되면 센서 진입 방향과 원주 방향의 자기장을 측정할 수 있다. 센서로 취득한 핀튜브 자기장 정보는 통신방식 FPGA (Field Programmable Gate Array)에 의하여 실시간 처리 가능하다. 본 검사장치로부터 헤더(Header) 내부에서 발생될 수 있는 결함 및 감육 상태를 진단하여, 이상상태를 빠르게 검출할 수 있을 뿐만 아니라 검사 범위가 기존에 비하여 획기적을 넓어 설비의 전반적인 안정성을 확보하는데 기여할 것으로 판단된다.