Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Analysis of Corrosion Resistance and Dew Point with Exhaust Gas Concentration and Temperature for Air Preheater Materials in Power Plants

발전소 공기예열기 소재의 배기가스 농도 및 온도에 따른 내식성 및 노점 분석

  • Seung-Jun Lee (Division of Marine Engineering, Kunsan National University)
  • 이승준 (군산대학교 ONSE대학 기관공학전공)
  • Received : 2023.10.10
  • Accepted : 2023.10.17
  • Published : 2023.10.30
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Abstract

Although many thermal power plants use heat recovery systems, high exhaust gas temperatures are maintained due to corrosion at dew points and ash deposits caused by condensate formation. The dew point of exhaust gas is primarily determined by the concentration of SO3 and steam, and various experiments and calculation equations have been employed to estimate it. However, these methods are known to be less suitable for exhaust gases with low SO3 concentrations. Therefore, in this study, since the temperature of the exhaust gas is expected to decrease due to the low-load operation of the coal-fired power plant, sulfuric acid condensation and low-temperature corrosion are anticipated. We aimed to conduct a quantitative evaluation to propose ways to prevent damage by limiting operating conditions and improving facilities. The experimental results showed that the corrosion rate increased linearly with rising temperatures at a certain sulfuric acid concentration. Furthermore, variations in sulfuric acid concentrations generated during the current power plant operation process did not significantly affect the dew point, and the dew point of sulfuric acid under these conditions was observed to be between 120 - 130 ℃.

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References

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