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- In relation to this article, we declare that there is no conflict of interest.
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Received March 7, 2023
Revised March 24, 2023
Accepted June 13, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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바이오매스 순환유동층 보일러의 열교환기 고온 부식 특성
Analysis of High-Temperature Corrosion of Heat Exchanger Tubes in Biomass Circulating Fluidized Bed Boiler
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Abstract
본 논문은 상용 바이오매스 발전소 가동 조건에서 열교환기 튜브의 고온 부식 특성 분석 결과를 보고하였다. 3종의
상용 열교환기 튜브(SA213T12, SA213T22, SA213T91) 및 열교환기 튜브의 표면 온도 조절이 가능하도록 자체 설계
된 고온 부식 평가 장치를 사용하였으며, 약 300시간 동안 다양한 온도 및 가동 조건에서 고온 부식 실험을 수행하였
다. 열교환기 튜브 소재에 따른 온도별 고온 부식 특성을 객관적으로 분석하기 위해서 국제표준(ISO 8407)에 입각하
여 부식생성물을 제거 후 고온 부식 실험 전후의 튜브 시편 무게 변화량을 산출하였다. 이를 통해 최종적으로 튜브 시
편의 평균 두께 감육량 및 감육 속도를 도출하였으며, 전자현미경(FE-SEM) 및 에너지분산형 분광분석법(EDS)을 이
요하여 튜브 시편의 표면과 단면의 부식 상태를 분석하였다. 본 연구 결과, 상용 열교환기 소재의 구성 성분 중 크롬
과 니켈의 함량이 증가할수록 소재의 고온 부식 특성이 우수하며, 표면 온도가 증가할수록 고온 부식이 촉진되는 것을
확인하였으며, 열교환 온도 조건에 따른 열교환기 튜브 교체주기를 예측할 수 있었다.
This paper presents the research results of analyzing the high-temperature corrosion characteristics of
three currently commercialized heat exchanger tube materials under actual operating conditions of a biomass power
plant. In order to precisely analyze the high-temperature corrosion characteristics of these materials, a high-temperature
corrosion evaluation device was installed in the power plant equipment, which allows for adjusting the surface temperature of
the heat exchanger tubes. Experiments were conducted for approximately 300 hours under various temperature and
operating conditions. In this study, the commercialized heat exchanger tube materials used were SA213T12, SA213T22,
and SA213T91 alloys. In order to objectively analyze the high-temperature corrosion characteristics of each material, an
international standard-based process to remove corrosion products was applied to obtain the weight change of the specimens, and
the average thickness loss and corrosion rate were derived. Thus, the high-temperature corrosion results for each condition were
quantitatively compared and analyzed. In addition, in order to increase the reliability of the high-temperature corrosion
evaluation method introduced in this study, the surface and cross-sectional corrosion of the specimens were confirmed
by using scanning electron microscopy and energy-dispersive X-ray analysis. Based on these analysis results, it was found that
the corrosion resistance of the commercial heat exchanger materials increases as the content of chrome and nickel in the
composition increases. Additionally, it was found that the corrosion phenomenon is rapidly accelerated as the surface
temperature increases. Finally, the replacement period (lifetime) of the heat exchanger tubes under each condition could
be inferred through this study.
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