http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김범신(Bum-Shin Kim),하정수(Jeong-Soo Ha),장성호(Seong-Ho Jang),최현선(Hyun-Sun Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
Most of the power plant companies currently intend to save maintenance cost for profit and competition, in spite of an increase in aged power plants. They prefer life extension of operating plant to construct new one. The RBI(Risk Based Inspection) technology is gradually considered solution which can satisfy this needs. The RBI can provide quantitative reference for assessment of components condition and long term strategy of equipment management. Especially risk ranking of RBI is useful method to devise components replacement plan for life extension. This paper suggests procedure, how to apply RBI to power plant maintenance, and provides case study of 400 ㎿ oil combustion power plant life extension using RBI.
화력발전 보일러 과열기 및 재열기 운전 중 튜브 온도예측기법
김범신(Bum Shin Kim),송기욱(Gee Wook Song),유성연(Seong Yeon Yoo) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.5
대용량 화력발전 보일러 과열기와 재열기 튜브는 과열에 취약하여 보일러 정지 시 튜브 내부의 산화 스케일 두께를 측정하여 과열상태를 평가한다. 산화스케일 두께측정에 의한 튜브 온도예측은 튜브의 발췌가 불가피하고 정확한 과열지점의 선정과 튜브의 초기운전온도가 확보되지 못하면 유의한 튜브온도예측결과를 얻을 수 없는 문제점이 있다. 또한 해석적 방법에 의해 튜브 온도를 예측하는 경우 튜브 외부 연소가스에 대한 연소, 복사, 대류 및 난류유동에 대한 방대한 해석이 필요한 반면 순시적인 부하의 변동, 탄종의 변화 및 운전방법의 변화를 반영할 수 없으므로 지속적인 튜브의 온도를 예측할 수 없는 단점이 있다. 본 논문에서는 보일러 운전정보와 유로망 해석을 통해 튜브의 열유속을 계산하고 이를 이용하여 단시간에 튜브의 온도를 예측할 수 있는 기법을 제시하였다. 본 기법을 Larson-Miller Parameter 법과 같은 실용적인 튜브 손상평가기법과 결합하면 유용한 고온손상감시의 수단으로 활용이 가능할 것으로 판단된다. The superheater and reheater tubes of a heavy-load fossil power plant boiler can be damaged by overheating, and therefore, the degree of overheating is assessed by measuring the oxide scale thickness inside the tube during outages. The tube temperature prediction from the oxide scale thickness measurement is necessarily accompanied by destructive tube sampling, and the result of tube temperature prediction cannot be expected to be accurate unless the selection of the overheated point is precise and the initial-operation tube temperature has been obtained. In contrast, if the tube temperature is to be predicted analytically, considerable effort (to carry out the analysis of combustion, radiation, convection heat transfer, and turbulence fluid dynamics of the gas outside the tube) is required. In addition, in the case of analytical tube temperature prediction, load changes, variations in the fuel composition, and operation mode changes are hardly considered, thus impeding the continuous monitoring of the tube temperature. This paper proposes a method for the short-term prediction of tube temperature; the method involves the use of boiler operation information and flow-network-analysis-based tube heat flux. This method can help in high-temperaturedamage monitoring when it is integrated with a practical tube-damage-assessment method such as the Larson-Miller Parameter.
김범신(Bum-Shin Kim),김종영(Jong-Young Kim),하정수(Jung-Su Ha),김의현(Eui-Hyun Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The main steam tube is one of the most frequently replaced equipments of power plant boiler. The reason of replacement is high temperature of tube operation environment. Especially local overheat of main steam tube can make damage and rupture of tube material, which causes accidental shutdown of boiler. The main steam tube overheat damage is almost due to the lack of uniformity of gas temperature distribution. There are two methods to protect overheat of main steam tube. The one is to control hot gas operation pattern which is temperature or flow distribution. the other is to control main steam flow distribution. This paper provides technology to extend operation life of main steam tube with main steam flow control method.
김범신(Bum-Shin Kim),유성연(Seong-Yeon Yoo) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.11
It is important that temperature distribution of heat exchanger tube panels is maintained uniformly in boiler operation. Especially local high temperature region of super heated steam tube panels makes serious failure of material. The steam flow control method with orfice is easy to apply for prevention of temperature distribution ununiformity. For optimized steam flow distribution, complicated and long time required calculation should be performed. In this paper, using few matrix relations, simple and fast analysis method that simulates boiler heat exchanger tube internal flow distribution is suggested.
발전용 보일러 주증기 튜브 과열방지용 오리피스 설계기법
김범신(Bum-Shin Kim),유성연(Seong-Yeon Yoo),하정수(Jung-Su Ha),김의현(Eui-Hyun Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
It is important that overheat protection of super heated tube in boiler operation and maintenance. The<br/> overheat of super heat tube can make damage and rupture of tube material, which causes accidental<br/> shutdown of boiler. The super heated tube overheat is almost due to the lack of uniformity of gas<br/> temperature distribution. There are two ways to protect overheat of super heated tube. The one is to<br/> control hot gas operation pattern which is temperature or flow distribution. the other is to control super<br/> heated steam flow distribution. The former is difficult than the later, because of control device design.<br/> In this paper steam flow control method which uses orifices is proposed to protect overheat of super<br/> heat tube.