Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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A Study on Characteristics of HRSG Boiler Inner Tube Scale

HRSG 보일러 튜브 내면 스케일의 특성연구

  • 이승민 (한국전력공사 전력연구원) ;
  • 민병연 (한국전력공사 전력연구원) ;
  • 정년호 (한국전력공사 전력연구원)
  • Received : 2011.08.25
  • Accepted : 2012.05.16
  • Published : 2012.06.30
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Abstract

The thickness and chemical composition of oxides on heat recovery steam generator tubes of combined cycle power plant were examined in order to evaluate the corrosion of the tubes. Tubes were removed from the plant after actual operations for 21,482, 42,552 and 56,123 hours respectively. Thickness and growth rate of the oxide scale on reheater inner tube (SA213-T22) were very high compared to those other tubes. The oxide scale was about $250{\mu}m$ thick and uniform. The components of the scale were iron oxides. The oxide scale was mixed oxides consisting of magnetite$(Fe_3O_4)$ and hematite$(Fe_2O_3)$. The oxide on inner tube was removed using many kinds of chemicals and it was found that chelating agents were dissolved faster than other chemicals.

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References

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