지역난방수 공급관 에어벤트 부식 파손 분석
Corrosion Failure Analysis of Air Vents Installed at Heat Transport Pipe in District Heating System
1
조회
0
다운로드
9
인용
0
참고문헌
키워드
초록
Two air vents situated on a heat transport pipe in district heating system were exposed to the same environmentfor 10 years. However, one air vent was more corroded than the other. It also had a hole on the top ofthe front-end pipe. Comparative analysis was performed for these air vents to identify the cause of corrosionand establish countermeasures. Through experimental observation of the damaged part and analyses of powderssampled from air vents, it was found that corrosion was initiated at the top of the front-end pipe. It thenspread to the bottom. Energy dispersive X-ray spectroscopy results showed that potassium and chlorine weremeasured from the corroded product in the damaged air vent derived from rainwater and insulation, respectively. The temperature of the damaged air vent was maintained at 75 ~ 120 °C by heating water. Rainwater-soakedinsulation around the front-end pipe had been hydrolyzed. Therefore, the damaged air vent was exposedto an environment in which corrosion under insulation could be facilitated. In addition, ion chromatographyand inductively coupled plasma measurements indicated that the matrix of the damaged front-end pipe containeda higher manganese content which might have promoted corrosion under insulation.
Abstract
Two air vents situated on a heat transport pipe in district heating system were exposed to the same environmentfor 10 years. However, one air vent was more corroded than the other. It also had a hole on the top ofthe front-end pipe. Comparative analysis was performed for these air vents to identify the cause of corrosionand establish countermeasures. Through experimental observation of the damaged part and analyses of powderssampled from air vents, it was found that corrosion was initiated at the top of the front-end pipe. It thenspread to the bottom. Energy dispersive X-ray spectroscopy results showed that potassium and chlorine weremeasured from the corroded product in the damaged air vent derived from rainwater and insulation, respectively. The temperature of the damaged air vent was maintained at 75 ~ 120 °C by heating water. Rainwater-soakedinsulation around the front-end pipe had been hydrolyzed. Therefore, the damaged air vent was exposedto an environment in which corrosion under insulation could be facilitated. In addition, ion chromatographyand inductively coupled plasma measurements indicated that the matrix of the damaged front-end pipe containeda higher manganese content which might have promoted corrosion under insulation.
참고문헌 (19)
- 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]
- S. Ghafghazi, "A multicriteria approach to evaluate district heating system options", Applied Energy, 87(4), pp.1134~1140 (2010), Elsevier BV[DOI]
- 김영수, "지역난방 첨두부하보일러 대류부 부식 파손 분석", CORROSION SCIENCE AND TECHNOLOGY, 18(2), pp.55~60 (2019), 한국부식방식학회
- Yoon-Suk Chang, "Fatigue data acquisition, evaluation and optimization of district heating pipes", Applied Thermal Engineering, 27(14-15), pp.2524~2535 (2007), Elsevier BV[DOI]
- Henrik Gadd, "Daily heat load variations in Swedish district heating systems", Applied Energy, 106, pp.47~55 (2013), Elsevier BV[DOI]
- 홍민기, "지역난방 배열 회수 보일러의 유동 가속 부식 원인 고찰", 한국재료학회지, 29(1), pp.11~15 (2019), 한국재료학회[DOI]
- H. Lund, "The role of district heating in future renewable energy systems", Energy, 35(3), pp.1381~1390 (2010), Elsevier BV[DOI]
- 홍민기, "지역난방 시스템의 순환수에 따른 보일러 튜브의 부식 특성", CORROSION SCIENCE AND TECHNOLOGY, 17(6), pp.287~291 (2018), 한국부식방식학회[DOI]
- Richárd Wéber, "Experimental and Numerical Analysis of Hydraulic Transients in the Presence of Air Valve", Periodica Polytechnica Mechanical Engineering, 62(1), pp.1~ (2017), Periodica Polytechnica Budapest University of Technology and Economics[DOI]
- G. Balacco, "Improved air valve design using evolutionary polynomial regression", Water Supply, 19(7), pp.2036~2043 (2019), IWA Publishing[DOI]
- 김형석, "지역난방 열배관망 운영데이터 기반의 파손확률 모델 개발", Korean Chemical Engineering Research(HWAHAK KONGHAK), 55(3), pp.322~331 (2017), 한국화학공학회
- Yong-Sang Kim, "Failure analysis of a thermally insulated pipeline in a district heating system", Engineering Failure Analysis, 83, pp.193~206 (2018), Elsevier BV[DOI]
- S. J. Cobbina, , Int. J. Sci. Technol. Res., 2, pp.1~ (2013)
- Katherine M. Mullaugh, "Characterization of carbohydrates in rainwater from the Southeastern North Carolina", Chemosphere, 107, pp.51~57 (2014), Elsevier BV[DOI]
- R. Javaherdashti, , J. Mater. Sci. Surf. Eng, 1, pp.36~ (2014)
- Susan Caines, "Analysis of pitting corrosion on steel under insulation in marine environments", Journal of Loss Prevention in the Process Industries, 26(6), pp.1466~1483 (2013), Elsevier BV[DOI]
- Susan Caines, "Experimental design to study corrosion under insulation in harsh marine environments", Journal of Loss Prevention in the Process Industries, 33, pp.39~51 (2015), Elsevier BV[DOI]
- 현영민, "인공 해수 중에서 탄소강의 부식특성에 미치는 합금원소 (Cr, Mn)의 영향", 대한금속·재료학회지, 54(2), pp.68~78 (2016), 대한금속·재료학회[DOI]
- B. Kim, , Adv. Mater. Sci. Eng., 2018, pp.1~ (2018)[DOI]