Simulation of Temperature Distribution and Power Generation Characteristics for a Honeycomb SOFC with Air-preheating Channels

概要

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SOFC systems require heat exchange devices to preheat the air, and usually the pre-heater becomes an encumbrance in downsizing. We present a new concept of a honeycomb SOFC which has air-preheating channels. In this SOFC, some honeycomb channels are used for preheating the air, and for cooling the cell stack. In this study, a quasi two-dimensional model was developed to calculate the temperature distribution and the power generation characteristics for H2 fuel. The temperature distributions along the gas flow direction were calculated and the cooling effects of the preheating air were discussed with an adiabatic condition. It was revealed that the air was preheated homogeneously, and the co-flow mode is more effective in preheating the air than the counter-flow mode. Because the spatial variation of temperature in the honeycomb walls was slight, the proposed honeycomb structure with air-preheating channels is expected to be effective in reducing the thermal stresses in high power density SOFC stacks. The result of the simulation also indicated that the power generation characteristics with co-flow condition were better than those with counter-flow condition.
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