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이연화(Younhwa Lee),김종민(Chongmin Kim),김만영(Man Young Kim),유명종(Myoung Jong Yu) 한국추진공학회 2009 한국추진공학회 학술대회논문집 Vol.2009 No.5
촉매 연소는 낮은 온도와 희박한 조건에서 연소가 가능할 뿐만 아니라 NOx, CO, UHC와 같은 오염물질을 효과적으로 감소시킬 수 있다. 하지만 촉매연소는 균질 반응뿐만 아니라 비균질 반응에 의해서 지배되는 매우 복잡한 반응과정을 가지고 있기 때문에 촉매 연소기의 안정적인 작동을 위해서는 다양한 탄화수소의 촉매연소 특성에 대한 연구가 필요하다. 연구에서는 메탄 촉매연소 특성에 대한 수치적 연구의 검증을 거친 후 수소의 공급량, 과잉공기비, 그리고 공간속도의 변화에 따른 프로판의 촉매연소 특성을 고찰하였다. The catalytic combustor has the advantage of stable combustion under very lean conditions with low emissions of NOX, CO and unburned hydrocarbon(UHC). Notwithstanding these advantages, the commercial application of the catalytic combustion has been delayed due to the complicated reaction process. For the stable operation of catalytic combustor, study on the combustion characteristics of the catalytic combustor is needed. So, in this study, numerical study on the propane combustion characteristics of the catalytic combustor with Pd-based catalyst is performed.
A Study on the Combustion Characteristics of MCFC Offgas Catalytic Combustors
이상민(Lee, Sang Min),이연화(Lee, Younhwa),안국영(Ahn, Kook Young),박인욱(Park, In-Wook) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Anode off-gas of high temperature fuel cells such as MCFC still contain combustible components such as hydrogen, carbon monoxide and hydrocarbon. Thus, it's very important to fully burn anode off-gas and use the generated heat in order to increase system efficiency. In the present study, catalytic combustors have been applied to high temperature MCFC system so that the combustion of anode-off gas can be boosted up. Since the performance of catalytic combustor directly depends on the combustion catalyst, this study has been focused on the experimental investigation on the combustion characteristics of multiple commercial catalysts having different structures and compositions. In order to determine the design conditions of the catalytic combustor, parameters such as inlet temperature, space velocity and excess air ratio have been varied and optimized for combustor design. Results show that H₂ in off-gas assists CH₄ combustion in a way that it decreases minimum inlet temperature limit and increases maximum space velocity while keeping high fuel conversion efficiency.
이상민(Sang Min Lee),홍동진(Dong Jin Hong),안국영(Kook Young Ahn),이연화(Younhwa Lee),유상석(Sang Seok Yu) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
An experimental study on the design of a catalytic combustor for high temperature MCFC system has been performed. The roles of the catalytic combustor are to completely burn anode off-gas and to supply sufficient CO₂ to cathode channels. In order to avoid hot spots or fuel slippage, flow uniformity at the catalyst inlet was achieved by installing two crossing perforated plates between the catalyst and the mixing chamber with minimal pressure drop. Effects of inlet temperature and fuel composition on catalytic combustion have been tested in the present study. A Pd/Ce/Ni-Al₂O₃ catalyst was used for complete combustion of the off-gas at GHSV = 36,000.
정민승(Minseung Jung),이연화(Younhwa Lee),이지근(Jeekeun Lee),김만영(Man Young Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The catalytic combustors have the advantage of stable combustion under very lean conditions with low emissions of NO<SUB>X</SUB>, CO and unburned hydrocarbon(UHC). A numerical study has been performed with the optimized kinetic parameter in order to compare the characteristics of methane and propane which are principal ingredients used in the catalytic combustion. The comparisons of the catalytic combustion characteristics between CH₄ and C₃H? are conducted according to operating conditions, including a excess air ratio, space velocity, inlet temperature and H2 addition.