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Korean Chemical Engineering Research,
Vol.56, No.6, 856-863, 2018
Vol.56, No.6, 856-863, 2018
순산소 순환유동층 연소 조건에서 생석회의 재탄산화 반응
Re-carbonation of Calcined Limestone Under Oxy-Circulating Fluidized Bed Combustion Conditions
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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