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Received February 13, 2019
Accepted March 22, 2019
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100 kWth 급 순환유동층 시스템에서 무연탄 순산소연소 특성 연구
Oxy Combustion Characteristics of Anthracite in a 100 kWth Circulating Fluidized Bed System
Ji-Hong Moon1 2
Sung-Ho Jo1 2
Tae-Young Mun1 2†
Sung-Jin Park1 2
Jae-Young Kim1 2
Nguyen Hoang Khoi1 3
Jae-Goo Lee1 4†
1한국에너지기술연구원 FEP 융합연구단, 34129 대전광역시 유성구 가정로 152 2한국에너지기술연구원 기후변화연구본부, 34129 대전광역시 유성구 가정로 152 3군산대학교 화학공학과, 54151 전라북도 군산시 대학로 558 4과학기술연합대학원대학교 신에너지 및 시스템공학, 34129 대전광역시 유성구 가정로 152
1Future Energy Plant (FEP) Convergence Research Center, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Korea 2Climate Change Research Division, Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Korea 3Chemical Engineering Department, Kunsan National University, Daehak-ro, Kunsan-si, Jeonbuk ,54154, Korea 4Advanced Energy and System Engineering, University of Science and Technology, 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129 Korea
Korean Chemical Engineering Research, June 2019, 57(3), 400-407(8), 10.9713/kcer.2019.57.3.400 Epub 3 June 2019
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Abstract
순산소 순환유동층 연소기술은 기후변화 및 연료 수급 문제들을 해결할 수 있는 기술로 주목 받고 있다. 순산소 순환유동층 연소기술은 배기가스 재순환 공정을 통해 이산화탄소를 비교적 쉽게 포집할 수 있으며 대기오염물질 배출도 줄일 수 있는 친환경 연소기술이다. 새롭게 개발된 100 kWth 급 순산소 순환유동층 연소 시스템은 연료다변화에 대응하기 위해 다양한 연료들의 순산소연소 특성을 분석하고 있으며, 본 연구에서는 높은 고정탄소 및 회분함량으로 인해 연소성이 낮은 연료로 알려진 무연탄을 활용하여 높은 이산화탄소를 생산하고 연소효율을 향상시키고자 하였다. 그 결과로서, 무연탄 순산소 연소는 아역청탄 공기연소 대비, 연소효율이 2% 향상되었으며 대기오염물질인 SO2, CO, NO은 각각 15%, 60%, 99% 감소하였다. 또한, 안정적인 순산소 순환유동층 연소를 통해 배기가스 내 94 vol.% 이상의 CO2가 포집될 수 있음을 확인하였다.
Oxy-combustion with a circulating fluidized bed (Oxy-CFBC) technology has been paid attention to cope with the climate change and fuel supply problem. In addition, Oxy-CFBC technology as one of the methods for carbon dioxide capture is an eco-friendly that can reduce air pollutants, such as SO2, NO and CO through a flue gas recirculation process. The newly developed 100 kWth pilot-scale Oxy-CFBC system used for this research has been continuously utilizing to investigate oxy-combustion characteristics for various fuels, coals and biomasses to verify the possibility of fuel diversification. The anthracite is known as a low reactivity fuel due to a lot of fixed carbon and ash. Therefore, this study aims not only to improve combustion efficiency of an anthracite, but also to capture carbon dioxide. As a result, compared to air-combustion of sub-bituminous coal, oxy-combustion of anthracite could improve 2% combustion efficiency and emissions of SO2, CO and NO were reduced 15%, 60% and 99%, respectively. In addition, stable operating of Oxy-CFBC could capture above 94 vol.% CO2.
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