http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
연소가스 상태를 고려한 노내 보일러튜브의 최고온 산정 방법론
박명수(Park Myungsoo),송기욱(Song Geewook),박준수(Park Jun-Su),조형희(Cho Hyunghee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
To prevent unscheduled trip of power plants by boiler tube damage, it is important to monitor boiler tube temperature during power plant operation. However, the direct measurement of tube temperature in the boiler is impossible by installing temperature probe during power plant operation because of harsh condition such as high temperature in the boiler heating zone. In this study, methodology to predict the tube temperature in the boiler heating zone is suggested using measured tube temperature in boiler none-heating zone. For precise local maximum tube temperature, the flue gas condition is considered.
최우성(Woosung Choi),송기욱(Geewook Song),김범신(Bumshin Kim),현중섭(Jungseob Hyun),허재실(Jaesil Heo) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.9
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. In view of the frequent start-ups and load changes in the recent past, there is a need for fossil-fuel power plants to be more efficient and reliable for long-term operation. Under high-temperature and high-pressure conditions, severe creep and fatigue damages can occur in major plant facilities, particularly, turbines and boilers. For highly stable operation and better maintenance, various techniques that facilitate a systematic assessment of the service life of critical facilities have been developed. However, to date, in Korea, to evaluate the remaining life of major facilities of fossil power plant, qualitative or semiquantitative analyses are carried out without following any standard guidelines or procedure. In this study, a standard code for assessing the remaining life of major plant facilities is proposed. This code takes into account creep and fatigue damage, which are generally accepted as dominant causes of damage to facilities. KEPIC (Korea Electric Power Industry code) is scheduled to include this guideline in 2010.
가스터빈용 소재 IN 738LC 합금의 미세조직 열화거동
유정훈,주성욱,신기삼,김의현,정진성,장성호,송기욱,하정수 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
IN 738LC, used as gas-turbine for power generation, was heat treated at 750℃, 850℃, 950℃ for 1000, 2000, and 4000 hrs. and the microstructural evolution are examined using optical microscope, XRD, SEM/EDS. For comparison, part of gas turbine used for 18439 hours for power generation was also examined. The results showed γ´, the main strengthening elements in this alloy, was about 300 nm and was about 56% in as-cast samples. The volume fraction of γ´peaked at 2000 hours at 750℃ and then decreased at further or longer heat treatment. The average diameter of the γ´ which was about 200 nm increased to about 1㎛. Carbides were formed at dendrite, cell, or grain boundaries which was ascribed to the segregation caused by solute redistribution during solidification. It was found that the at low temperature, M_6C type carbides formed, whereas carbides of M_23C_6 type formed at higher temperature, or at longer degradation.