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강민웅(Min-Woong Kang),서동균(Dong-Kyun Seo),이선기(Sun-Ki Lee),황정호(Jung-Ho Hwang),임성진(Sung-Jin Yim) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
It is important to develop an evaluation technique for design and performance optimization of coal gasifiers using a numerical simulation model, and to confirm the validity of the model. The coal gasification process of an entrained-flow gasifier for integrated coal gasification combined cycle(IGCC) plant, so called as Shell type gasifier, was numerically predicted with a commercial code, FLUENT. By classifying the complicated process into several simplified stages of slurry evaporation, coal devolatilization, and chemical reactions coupled with turbulent flow and heat transfer, a comprehensive numerical model was constructed to simulate the coal gasification process. In this work, we have used Finite rate/eddy dissipation model to have a modeling of chemical/flow interaction. In this model, concentrations of CO and H₂ were calculated for various oxygen to coal ratios(0.29~0.87) at steam to coal ratio, 0.11, and length to diameter ratio(2~4) at oxygen to coal ratios, 0.72, and steam to coal ratio, 0.11. The results showed the operating point for the maximum gasifier efficiency was the O₂/coal ratio, about 0.5, and L/D ratio that was similar from 2 to 4.