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순환유동층보일러의 과열기 튜브 부식에 알칼리 금속과 염소가 미치는 영향

Effects of Alkali Metals and Chlorine on Corrosion of Super Heater Tube in Biomass Circulating Fluidized Bed Boiler

  • 투고 : 2016.10.19
  • 심사 : 2016.11.24
  • 발행 : 2017.02.10

초록

본 연구에서는 순환유동층 보일러 과열기 튜브의 부식 원인물질을 규명하여, 부식방지를 위한 방안을 모색하고자 하였다. 연료, 과열기 튜브 부식부위, 과열기 튜브에 부착된 재 및 보일러 재를 채취하여 성분분석을 수행하였다. 과열기 튜브 부식부위에서 산화로 인한 O성분이 함유되어 있는 것을 확인하였다. 과열기 튜브 부착 재 및 보일러 재에서 6.1% 및 4.3%의 Cl이 분석되었으며, 이는 설계값의 약 14-20배 정도 높은 수치이다. 또한 알칼리 금속물질(K, Na, Ca)의 함량이 매우 높게 분석되었다. XRF 데이터를 이용하여 보일러에서 재의 슬래깅과 파울링에 대한 영향을 예측하였다. Basicity는 과열기 튜브 부착 재 및 보일러 재에서 각각 3.62 및 2.72로 산정되었으며, 설계값인 0.35에 비하여 높은 수치를 갖는 것으로 확인되었다.

키워드

corrosion;circulating fluidized bed boiler;biomass;alkaline metal;chlorine

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과제정보

연구 과제 주관 기관 : 환경부