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아레니우스-와이블 모형을 이용한 리드프레임 도금두께의 가속수명시험 설계
정권석,차종범,김광섭 대한설비관리학회 2001 대한설비관리학회지 Vol.6 No.4
This paper proposes the standardization in the field of education and training for maintenance personnel. This is particularly important because of the following reasons: firstly, most of sophisticated system or equipment are getting more and more important in terms of cost, quality, product liability, etc. and so the economic and social responsibilities of maintenance men play more important role in business activities. Secondly, maintenance works have been one of 3D jobs and so it is required for maintenance men to have motivation for higher performance. Even though maintenance works depend upon contingency factors, the development of standards of maintenance works and appropriate education and training, and implementation through the incorporation in national standards or possibly internationally are necessary. This paper identifies 5 kinds of skills and each skill includes 6 to 11 different kinds of sub skills and is classified as 3 levels, such as basic, technical and specialty.
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열화된 CrMoV 주조강에 대한 보수 용접 방법 및 후열처리 특성 평가
홍재훈,전문창,정권석,이영국 한국열처리공학회 2022 熱處理工學會誌 Vol.35 No.3
Recently the growth of the renewable energy production has caused the flexible operation in LNG combined cycle power plant. Due to the rapid start and stop operations, large CrMoV castings used for turbine casings and valve bodies could be distorted and lead to replacement or welding repair. This study was performed to find out the characteristics of the repair welding for a damaged CrMoV casting steel. A typical field repair method (arc & TIG welding) was applied to making specimens. The degraded N2 packing head sample from the steam turbine was used. The evaluations of weldments were carried out in terms of microstructural characterization, microhardness measurements, tensile, creep-rupture and fatigue tests. Color etching was also applied for better understanding of welding microstructures. As the boundary between HAZ and base material was deteriorated by welding, it caused microstructural changes formed during PWHT and the shortening of the remaining residual life. By comparing the properties according to repair welding method, it was possible to derive what important welding factors were. As a result, arc welding method is more suitable for repair welding on CrMoV castings.
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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.
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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
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