Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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The Attrition and Calcination Characteristics of Domestic Limestones for In-Situ Desulfurization in Circulating Fluidized Bed Boilers

순환유동층 로내 탈황을 위한 국내 석회석의 마모 및 소성 특성

  • Kim, Ye Bin (Department of Mineral resources energy engineering, Chonbuk national university) ;
  • Kang, Seo Yeong (Department of Mineral resources energy engineering, Chonbuk national university) ;
  • Seo, Su Been (Department of Mineral resources energy engineering, Chonbuk national university) ;
  • Keel, Sang In (Environment System Research Division, Korea Institute of Machinery and Materials) ;
  • Yun, Jin Han (Environment System Research Division, Korea Institute of Machinery and Materials) ;
  • Lee, See Hoon (Department of Mineral resources energy engineering, Chonbuk national university)
  • 김예빈 (전북대학교 자원에너지공학과) ;
  • 강서영 (전북대학교 자원에너지공학과) ;
  • 서수빈 (전북대학교 자원에너지공학과) ;
  • 길상인 (한국기계연구원 환경시스템연구본부) ;
  • 윤진한 (한국기계연구원 환경시스템연구본부) ;
  • 이시훈 (전북대학교 자원에너지공학과)
  • Received : 2019.04.23
  • Accepted : 2019.05.04
  • Published : 2019.10.01
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Abstract

In order to investigate the behavior of limestones which have been usually used for in-situ desulfurization reaction in circulating fluidized bed combustors, the attrition characteristics and calcination reactions of domestic limestones were analyzed in this study by using a thermogravimetric analyzer and an ASTM D5757-95 attrition tester. The average size distribution of limestones in circulating fluidized bed boilers have to be changed due to the attrition of particle-particle and particle-reactor wall and the calcination reaction. Domestic limestones might be used in commercial circulating fluidized bed boilers, but the attrition behaviors and particle size changes of limestones were varied. In calcination experiments at $850^{\circ}C$, the calcination reaction were varied with limestone samples. The calcination reaction time increased with an increase of particle size. Also, fine particles generated the attrition test of calcined limestone was 20% higher than those generated the attrition test of original limestone.

순환유동층 연소로에서 탈황을 위하여 사용되는 석회석의 거동을 분석하기 위하여 국내에서 생산되는 석회석의 마모 및 소성 반응 특성을 고찰하였다. 이를 위하여 열중량분석기 및 ASTM D5757-95 마모 시험기를 이용하였다. 순환유동층 내의 석회석의 입도는 입자-입자, 입자-반응기 외벽의 충돌에 따른 마모와 소성 반응에 따라 변화하게 된다. 국내에서 공급된 석회석 시료들은 상용 순환유동층 보일러에서 이용가능하나 석회석들 간의 마모 및 평균 입도 변화는 서로 다르게 나타났다. 또한 순환유동층 보일러의 조업온도인 $850^{\circ}C$에서 진행된 소성 반응도 석회석 별로 차이가 나타났다. 특히 입자의 크기가 증가할수록 소성 반응에 필요한 시간이 증가함을 확인하였다. 더불어 소성된 석회석 시료는 20% 이상 비산입자를 많이 배출하였다.

Keywords

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