Corrosion Science and Technology

  • 제20권2호
  • /
  • Pages.69-76
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  • 2021
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
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배열회수보일러 복수예열기 부식 파손 분석

Corrosion Failure Analysis of Condensate Pre-Heater in Heat Recovery Steam Generator

  • 채호병 (충남대학교신소재공학과) ;
  • 김우철 (한국지역난방공사미래개발원) ;
  • 김희산 (홍익대학교 재료공학과) ;
  • 김정구 (성균관대학교신소재공학부) ;
  • 김경민 (한국지역난방공사미래개발원) ;
  • 이수열 (충남대학교신소재공학과)
  • Chae, Hobyung (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Woo Cheol (R&D Institute, Korea District Heating Corp.) ;
  • Kim, Heesan (Department of Materials Science and Engineering, Hongik University) ;
  • Kim, Jung-Gu (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Kim, Kyung Min (R&D Institute, Korea District Heating Corp.) ;
  • Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
  • 투고 : 2021.02.23
  • 심사 : 2021.03.16
  • 발행 : 2021.04.30
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초록

In this work, we have performed a corrosion failure analysis of a leaking tube connected to an upper header of a condensate pre-heater in a heat recovery steam generator. It was revealed that the leakage position in the tube was the location where the materials were easily vulnerable due to tensile residual stresses induced by the material manufacturing process and welding process. In addition to an imbalance in the module induced by temperature difference during operation of the pre-heater, the weight of the modules and thermal fatigue provoked a type of stress of tensile-tensile fatigue on the tube. Thus, the leakage position of the pre-heater was exposed to the tensile stress on the inner surface of the tube facing the gas, which rendered the unstable oxide layer susceptible to corrosion and the formation of pits on the water side. The cracks propagated along with the degraded microstructure in a transgranular cracking mode under fatigue loading and finally resulted in water leakage.

키워드

과제정보

본 연구는 한국지역난방공사의 지원에 의해 수행된 연구입니다. 김우철, 김경민은 2017년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 연구를 수행하였습니다 (No. 2017010000190).

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