지역난방 증기 터빈 내 조속기 밸브 Inlet pipe 파손 원인 분석
Failure Analysis of an Inlet Pipe of a Governor Valve in a Steam Turbine of a District Heating System
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
The objective of this study was to perform failure analysis of an inlet pipe located in a governor valve of a steam turbine in a district heating system. During the operation, the temperature of the governor valve was increased to as high as ~500 oC, which induced thermal expansion of the inlet pipe along both axial and radial directions. While the inlet pipe did not have contact with the valve seat, the side plane of the upside was constrained by the casing part, which led the inlet pipe to experience stress field in the form of fatigue and creep. The primary crack was initiated at about 30 mm below the top where the complex stress field was anticipated. These results suggest that the main failure mechanism is a combination of thermal fatigue and creep during the operation supported by the observation of apparent beach marks on the fracture surface and pores near the cracks, respectively.
Abstract
The objective of this study was to perform failure analysis of an inlet pipe located in a governor valve of a steam turbine in a district heating system. During the operation, the temperature of the governor valve was increased to as high as ~500 oC, which induced thermal expansion of the inlet pipe along both axial and radial directions. While the inlet pipe did not have contact with the valve seat, the side plane of the upside was constrained by the casing part, which led the inlet pipe to experience stress field in the form of fatigue and creep. The primary crack was initiated at about 30 mm below the top where the complex stress field was anticipated. These results suggest that the main failure mechanism is a combination of thermal fatigue and creep during the operation supported by the observation of apparent beach marks on the fracture surface and pores near the cracks, respectively.
참고문헌 (8)
- Minki Hong, "Failure Analysis of a Water Wall Boiler Tube for Power Generation in a District Heating System", Metals and Materials International, 25(5), pp.1191~1201 (2019), 대한금속·재료학회[DOI]
- 홍민기, "지역난방 배열 회수 보일러의 유동 가속 부식 원인 고찰", 한국재료학회지, 29(1), pp.11~15 (2019), 한국재료학회[DOI]
- 김영수, "지역난방 첨두부하보일러 대류부 부식 파손 분석", CORROSION SCIENCE AND TECHNOLOGY, 18(2), pp.55~60 (2019), 한국부식방식학회
- 이형준, "지역난방수 공급관 에어벤트 부식 파손 분석", CORROSION SCIENCE AND TECHNOLOGY, 19(4), pp.189~195 (2020), 한국부식방식학회[DOI]
- 조정민, "맨홀에 설치된 지역난방 열공급관 에어벤트의 전단부 파손 원인 규명", CORROSION SCIENCE AND TECHNOLOGY, 19(4), pp.196~202 (2020), 한국부식방식학회[DOI]
- 김유섭, "지역난방 열수송관 국부 부식 파손 분석", CORROSION SCIENCE AND TECHNOLOGY, 19(3), pp.122~130 (2020), 한국부식방식학회[DOI]
- Hobyung Chae, "Stress Corrosion Cracking of a Copper Pipe in a Heating Water Supply System", Metals and Materials International, 26(7), pp.989~997 (2020), 대한금속·재료학회[DOI]
- Elena Paffumi, "Experimental and numerical assessment of thermal fatigue in 316 austenitic steel pipes", Engineering Failure Analysis, 47, pp.312~327 (2015), Elsevier BV[DOI]