배열회수보일러 고압 슈퍼히터 튜브 열화도 평가
Degradation Evaluation of High-Pressure Superheater Tube in Heat Recovery Steam Generator
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In this work, the degradation of high-pressure superheater tubes exposed to the flame of a duct burner in a heat recovery steam generator of a district heating system was evaluated. To assess the deterioration of the used superheater tube, the microstructure, microhardness, and tensile properties were investigated by comparison to an unused tube. The study found that a fin bound at the outer surface of the used tube became fragile only in the location facing the flame. This indicates that the tube was directly exposed to the flame from the duct burner or underwent abnormal overheating. While the unused tube showed a uniform value in hardness and equiaxial grain structure, the used tube revealed a decrease in hardness up to 105 HV and an increase in grain size with a plate-like morphology in the location facing the flame. The coarsening of the grain structure by the flame weakened the mechanical properties of yield strength, tensile strength, and elongation.
Abstract
In this work, the degradation of high-pressure superheater tubes exposed to the flame of a duct burner in a heat recovery steam generator of a district heating system was evaluated. To assess the deterioration of the used superheater tube, the microstructure, microhardness, and tensile properties were investigated by comparison to an unused tube. The study found that a fin bound at the outer surface of the used tube became fragile only in the location facing the flame. This indicates that the tube was directly exposed to the flame from the duct burner or underwent abnormal overheating. While the unused tube showed a uniform value in hardness and equiaxial grain structure, the used tube revealed a decrease in hardness up to 105 HV and an increase in grain size with a plate-like morphology in the location facing the flame. The coarsening of the grain structure by the flame weakened the mechanical properties of yield strength, tensile strength, and elongation.
참고문헌 (17)
- 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]
- 이부윤, "과도열응력해석을 이용한 배열회수보일러 고압드럼의 부식피로에 관한 안전성 평가", 한국정밀공학회지, 35(11), pp.1099~1105 (2018), 한국정밀공학회
- Yuyang Li, "Mechanical properties and phases evolution in T91 steel during long-term high-temperature exposure", Engineering Failure Analysis, 111, pp.104451~ (2020), Elsevier BV[DOI]
- Fujio Abe, "Precipitate design for creep strengthening of 9% Cr tempered martensitic steel for ultra-supercritical power plants", Science and Technology of Advanced Materials, 9(1), pp.013002~ (2008), Informa UK Limited[DOI]
- Qiuzhi Gao, "Precipitates and Particles Coarsening of 9Cr–1.7W–0.4Mo–Co Ferritic Heat-Resistant Steel after Isothermal Aging", Scientific Reports, 7(1), pp.5859~ (2017), Springer Science and Business Media LLC[DOI]
- M. Godec, "Coarsening behaviour of M23C6 carbides in creep-resistant steel exposed to high temperatures", Scientific Reports, 6(1), pp.29734~ (2016), Springer Science and Business Media LLC[DOI]
- Dewa Nyoman Adnyana, "CAVITATION-EROSION STUDY IN ELBOW TUBES OF A LOW-PRESSURE EVAPORATOR OUTLET HEADER", Metalurgi, 35(1), pp.33~ (2020), Indonesian Institute of Sciences[DOI]
- S. Tsubakizaki, "Mitsubishi Heavy Industries Techical Review", Mitsubishi Heavy Industries Techical Review, 54, pp.3~ (2017)
- S. Tsubakizaki, "Mitsubishi Heavy Industries Techical Review", Mitsubishi Heavy Industries Techical Review, 52, pp.105~ (2015)
- M. Nematollahi, "Failure Analysis of Low Pressure Evaporator Tubes in a Typical Combined Cycle Power Plant", Applied Mechanics and Materials, 110-116, pp.4607~4614 (2011), Trans Tech Publications, Ltd.[DOI]
- 김대희, "덕트 버너 추가에 따른 수직형 HRSG 내 화염 복사 열전달의 영향에 관한 연구", 대한기계학회논문집 B, 37(2), pp.197~204 (2013), 대한기계학회
- Mengqi Zhang, "High-Temperature Oxidation Behavior of a Cu-Bearing 17Cr Ferritic Stainless Steel", Scanning, 2020, pp.1~11 (2020), Hindawi Limited[DOI]
- M. Halvarsson, "Microstructural investigation of the breakdown of the protective oxide scale on a 304 steel in the presence of oxygen and water vapour at 600 °C", Corrosion Science, 48, pp.2014~ (2006)[DOI]
- 정광후, "고온의 대기 및 SO2 가스환경 하에서 AISI 304강의 산화 및 부식 특성", 한국마린엔지니어링학회지, 42(7), pp.554~559 (2018), 한국마린엔지니어링학회[DOI]
- Houlong Liu, "Laves phase precipitation behavior and high-temperature strength of W-containing ferritic stainless steels", Journal of Materials Research and Technology, 9(2), pp.2127~2135 (2020), Elsevier BV[DOI]
- Daehee Oh, "Effects of alloying elements on the thermal fatigue properties of the 15wt% Cr ferritic stainless steel weld HAZ", Materials Science and Engineering: A, 555, pp.44~51 (2012), Elsevier BV[DOI]