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Received July 27, 2018
Accepted October 4, 2018
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순산소 순환유동층 연소 조건에서 생석회의 재탄산화 반응
Re-carbonation of Calcined Limestone Under Oxy-Circulating Fluidized Bed Combustion Conditions
전북대학교 자원에너지공학과, 54896 전라북도 전주시 덕진구 백제대로 567 1한국기계연구원 환경기계연구실, 34103 대전광역시 유성구 가정북로 156
Department of Mineral Resources and Energy Engineering, Chonbuk National University, 567, Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Korea 1Environment Systems Research Division, Korea Institute of Machinery and Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Korea
donald@jbnu.ac.kr
Korean Chemical Engineering Research, December 2018, 56(6), 856-863(8), 10.9713/kcer.2018.56.6.856 Epub 4 December 2018
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Abstract
순산소 순환유동층 보일러에서 탈황을 위해 이용되는 석회석의 재탄산화 거동을 분석하기 위하여, 상용 순환유동층 보일러에서 이용되는 석회석 4종의 재탄산화 반응 특성을 열중량분석기(TGA-N1000)에서 고농도의 CO2 가스를 이용하여 분석하였다. 생석회의 재탄산화 반응은 반응온도(600~900 °C), 석회석의 CaCO3 함량(77~95%) 등의 조건에 따른 질량 변화를 통해 고찰되었다. 600~800 °C의 온도 영역에서는 반응 온도가 증가함에 따라 전환율이 증가하였고, 850~900 °C 에서는 반응 온도가 증가함에 따라 전환율이 감소하는 경향이 발견되었다. CaCO3 함량의 경우, 870 °C의 반응온도에서 뚜렷한 전환율의 차이를 보였다. 또한 기-고체반응속도 모델들에 적용하여 석회석의 재탄산화 반응을 모사하는 반응속도식을 제시하였다.
In order to investigate the re-carbonation behaviors of limestones in an oxy-circulating fluidized bed combustor (Oxy-CFBC), the re-carbonation characteristics of domestic 4 different limestone samples were analyzed in a thermogravimetric analyzer (TGA-N1000) with the higher concentration of CO2. Effect of reaction temperature (600~900 °C) and CaCO3 content (77~95%) of limestones were determined and the mass change of the CaO was observed. Under the temperature of 800 °C, the conversion rate increased with increasing reaction temperature. However, the conversion rate decreased with increasing reaction temperature over 800 °C. In the case of CaCO3 content, the conversion was remarkably different at 870 °C. In addition, reaction rate equations for simulating the re-carbonation of limestone by using gas solid reaction models were proposed in this study.
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