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D화력 순환유동층 보일러에서의 무연탄 연소 특성
Combustion Characteristics of Anthracite Coal in the D CFB Boiler
한국과학기술원 화학공학과 & 에너지 및 환경 연구센터, 대전 1한전 전력연구원 발전연구실 연소 신발전그룹, 대전 2건국대학교 화학공학과, 서울
Department of Chemical Engineering and Energy and Environment Research Center, Korea Advanced Institute of Science and Technology, Taejon, Korea 1Power Generantion Lab. Advanced Power Generation & Combustion Group, KEPRI, KEPCO, Taejon, Korea 2Department of Chemical Engineering, Konkuk University, Seoul, Korea
kimsd@kaist.ac.kr
HWAHAK KONGHAK, August 2000, 38(4), 516-522(7), NONE
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Abstract
무연탄을 연료로 사용하는 D화력 순환유동층 보일러의 운전 특성을 유연탄을 사용하는 국내 상용 순환유동층 보일러와 비교하여 고찰하였다. 무연탄의 높은 회재 함량으로 인해 층물질을 회재만을 사용하는 D화력 순환유동층 보일러는 다른 국내 상용 유연탄 순환유동층 보일러에 비해 알칼리.산비가 0.11로 아주 낮아 상대적으로 클링커 형성에 안정적인 것으로 나타났으며, 층물질의 입도분포는 모래를 사용하는 유연탄 순환유동층 보일러에 비해 비교적 광범위한 입도분포를 갖는 것으로 나타났다. D화력 순환매체의 입도는 대부분 100-400μm로 나타났으며, 미연분의 대부분은 100μm 이하의 비산 회재에 포함되어 있어 이의 저감을 위해서는 석탄입도의 적절한 조절이 요구되는 것으로 나타났다. 국내무연탄 순환유동층 연소로의 하부 온도는 850-870℃정도로 유연탄 보일러와 비슷하게 나타났으나, 국내무연탄의 낮은 연소반응성과 미연분의 후연소의 인해 연소로 상부 및 싸이클론 입,출구 등의 온도가 40-80℃이상 높은 특징을 띠는 것으로 나타나 국내 무연탄용 순환유동층 설계 및 적용, 운전에 있어 이의 고려가 이루어져야 하는 것으로 나타났다.
The circulating fludized bed (CFB)boiler which uses anthracite coal by fuel in the D power plant is compared with commercial CFB boiler which uses bituminous coal. According to the high ash content of anthracite coal, the ash was only used by fluidizing materials and B/A ratio of the ash was 0.11, so it was relatively difficult to form a clinker. Particle size distribution of bed materials was very wider than that of other CFB combustor. Particle size distribution of bed materials was 100-400 μm and unburned carbon is almost contained in fly ash and especially concentrated under 100 μm particles. So it is needed to control particles size distribution of coal. The temperature range of dense phase of the D CFB boiler is 850-870℃ and is similar to that of other CFB boilers. Because of low combustion efficiency and post combustion of unburned carbon, the temperature of len phase, cyclone inlet and outlet temperature were higher than these of other CFB boilers. Therefore. low combustion efficiency and post combustion might be considered to design and apply CFB boiler which used anthracite coal.
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