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HWAHAK KONGHAK,
Vol.32, No.1, 18-27, 1994
Vol.32, No.1, 18-27, 1994
석탄유동층 연소로에서의 Freeboard 연소특성 II. 수학적 모델링
Characteristics of the Freeboard Combustion in a Fluidized-Bed Coal Combustor-II. Mathematical Modeling
국내 무연탄을 대상으로하는 유동층 연소로에 있어서 freeboard에서 일어나는 탄소연소반응을 해석하기 위해 연소로내 탄소비산구조를 설정하고 관련된 reaction kinetics 를 적용하여 freeboard 탄소연소반응의 수식모델을 전개하였다. 모델의 해석을 통해 산출된 탄소연소율, 가스농도분포 및 온도분포 등의 freeboard 탄소연소반응의 주요 특성치는 실험치와 비교적 근사한 일치를 보였으며, 모델에 적용된 kinetic parameter중 탄소연소반응의 표면반응속도상수는 freeboard내 온도 및 가스조성에 커다란영향을 주며 CO 재연소반응속도상수는 CO 농도분포에 지배적인 영향을 주는 것으로 나타났다.
A mathematical model for the carbon combustion reaction in the freeboard of a fluidized bed combustor using domestic anthracite coal was developed by using the entrainment mechanism of unburned carbon particle and applying the related reaction kinetics. The extent of carbon combustion, gas composition and temperature distributions in the freeboard can be determined from the proposed model. It was also found that among the kinetic parameters, the surface reaction rate constant gives significant effects on the temperature and gas compositions in the freeboard, while the CO combustion reaction rate constant gives a dominant effect on CO composition in the freeboard.
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