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스팀을 이용한 중국산 신화 석탄 촤 가스화 반응에 관한 연구
강민웅(Min-Woong Kang),서동균(Dong-Kyun Seo),김용택(Yong-Tak Kim),황정호(Jungho Hwang) 한국연소학회 2010 한국연소학회지 Vol.15 No.1
In this study, carbon conversion was measured using an electronic mass balance. In a lab scale furnace, each coal sample was pyrolyzed in a nitrogen environment and became coal char, which was then gasified with steam under isothermal conditions. The reactivity of coal char was investigated at various temperatures and steam concentrations. The VRM(volume reaction model), SCM(shrinking core model), and RPM(random pore model) were used to interpret experimental data. For each model the activation energy(Ea), pre-exponential factor (A), and reaction order(n) of the coal char-steam reaction were determined by applying the Arrhenius equation into the data obtained with thermo-gravimetric analysis(TGA). According to this study, it was found that experimental data agreed better with the VRM and SCM for 1,000 and 1,100℃, and the RPM for 1,200 and 1,300℃. The reactivity of chars increased with the increase of gasification temperature. The structure parameter(Ψ) of the surface area for the RPM was obtained.
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.
1단 분류층 석탄 가스화기의 전산수치해석 : 작동조건과 주입 노즐의 각도변화에 따른 영향
송지훈(Ji-Hoon Song),강민웅(Min-Woong Kang),서동균(Dong-Kyun Seo),황정호(Jung-Ho Hwang),임성진(Sung-Jin Lim) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Coal gasification is heading for a great future as one of the most renewable energy sources, which can produce not only electricity and heat, but also gaseous and liquid fuels from the synthesis. The work focuses on entrained flow gasification, especially Integrated coal Gasification Combined Cycle(IGCC) plant which is commercially available on a large scale plant. As constructing an IGCC plant is considerably complicated and expensive compared with a pulverized-coal power plant, it is important to determine optimum design factors and operating conditions using a computational fluid dynamics (CFD) model. In this study, we calculated various operation conditions and swirl injections : oxygen to coal ratios(0.66-1.08), steam to coal ratios(0.003-0.075), coal particle sizes(50-300㎛), and injection angles(0-6˚, clockwise). The results of numerical calculations show that O₂/Coal ratio, 0.83, Steam/Coal ratio, 0.05, coal particle diameter, 100㎛, injection angle, 4˚-6˚, are the most optimum in this research.