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석탄화력발전소 보일러 튜브 마모 문제에 관한 저온공기 속도 측정법 적용 및 검증
유기수(Kisoo Yoo),정권석(Kwon-Seok Jeong) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.6
비산회에 의한 보일러 튜브 마모 문제는 석탄화력 보일러 튜브 파손에 주요한 요인이 된다. 때문에 튜브 보호막이나 다공판 등이 마모 문제 완화를 위하여 사용되고 있다. 그러나 비산회에 의한 튜브마모 문제는 이런 방법을 통하여 완전히 해결될 수 없는데 이는 보일러 마다 유동 조건이 다를 뿐만 아니라 예상치 못한 위치에서 국부적으로 마모가 심화될 수 있기 때문이다. 문제는 보일러 내부 비대칭 유동과 국부적 유속 증가에서 기인함으로 튜브 마모 문제의 해결에 있어서 보일러 내부 유동을 명확히 파악하는 것이 무엇 보다 중요하다 하겠다. 본 연구에서는 튜브 마모 문제에 해결을 위해 사용되는 Cold Air Velocity Technique(CAVT)에 대하여 고찰하고 하동화력 2호기 보일러에 대하여 CAVT를 실제 적용함으로써 석탄화력 보일러에 있어서 CAVT 적용 가능성을 검증하였다. Fly ash erosion is a leading cause of boiler tube failure in PC boilers. Therefore, shields or baffle plates are installed in specific areas to mitigate fly ash erosion and prevent boiler tube failure. However, the tube failure problems caused by fly ash erosion cannot be eliminated with this solution alone, because each PC boiler has a different flue-gas flow pattern and erosion can become severe in unexpected zones. This problem is caused by an asymmetric internal flow velocity and local growth of the flue gas velocity. For these reasons, clearly defining the flow pattern in PC boilers is important for solving the problem of tube failure caused by fly ash erosion. For this purpose, the cold air velocity technique (CAVT) can be applied to the fly ash erosion problem. In this study, CAVT was carried out on the Hadong #2 PC boiler and the feasibility of application of CAVT to conventional PC boilers was validated.
EV Battery Pack 고장분석에 있어서 EIS Analysis 적용에 관한 연구
유기수(Kisoo Yoo),남윤정(Yoon-Jung Nam),김언효(Eon-Hyo Kim),이다은(Daeun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
EV battery packs have mechanical structural problems such as cell/module fixation failure and thermal problems such as heat dissipation performance degradation. In this study, we tried to confirm the applicability of Electrochemical Impedance Spectroscopy Analysis to detect such failures in advance. General aging, vibration, and high-temperature accelerated aging tests were performed on a cell-by-cell basis, and EIS analysis was performed for each cycle. Through EIS analysis, it was confirmed that the electrode aging was induced in the vibration acceleration test while the electrolyte degradation was done in the high temperature accelerated aging test, respectively. Also, the possibility of EV application was investigated by manufacturing a BMS-linked EIS module. In this case, auto z-fitting algorithm was developed and tested to confirm the ECM(equvialent circuit model) element value
석탄화력발전소 보일러 튜브 마모 문제에 관한 Cold Air Velocity Technique 적용 방안 연구
유기수(Kisoo Yoo),정권석(Kwon-Seok Jeong) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Fly ash erosion is leading cause of boiler tube failure in a PC boiler. The Pri. RH and Economizer, especially, are plagued with fly ash erosion problem, so shields or baffle plates, mitigating fly ash erosion, are installed on the areas to prevent a boiler tube failure. However, the tube failure problems caused by fly ash erosion cannot be eliminated only by the solution, because each PC boilers are different in flue gas flow pattern to one another and erosion can be severe at the unsuspected zone. The problem is caused by asymmetric internal flow velocity and local growth of flue gas velocity. For these reasons, clearly defining the flow pattern in PC boiler is important to solve the tube failure caused by fly ash erosion, so, CAVT is needed to apply to the fly ash erosion problem. This study carries out CAVT on the Hadong #2 PC boiler and validates probability of applying CAVT to the conventional PC Boiler