Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Degradation Evaluation of High-Pressure Superheater Tube in Heat Recovery Steam Generator

배열회수보일러 고압 슈퍼히터 튜브 열화도 평가

  • Song, Min Ji (Department of Materials Science and Engineering, Chungnam National University) ;
  • Choi, Gahyun (Department of Materials Science and Engineering, Chungnam National University) ;
  • 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) ;
  • Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
  • 송민지 (충남대학교 신소재공학과) ;
  • 최가현 (충남대학교 신소재공학과) ;
  • 채호병 (충남대학교 신소재공학과) ;
  • 김우철 (한국지역난방공사 미래개발원) ;
  • 김희산 (홍익대학교 재료공학과) ;
  • 김정구 (성균관대학교 신소재공학부) ;
  • 이수열 (충남대학교 신소재공학과)
  • Received : 2022.02.10
  • Accepted : 2022.02.10
  • Published : 2022.05.06
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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.

Keywords

Acknowledgement

본 연구는 한국지역난방공사의 지원과 2022년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원의 지원을 받아 수행된 연구임(P0002019, 2022년 산업전문인력역량강화사업).

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