Coupled heat transfer characteristics and parameter influence analysis of SOFC cathode air preheater
For the SiC-based cathodic air preheater,a novel SOFC high temperature heat exchanger,the coupled radiation-conduction-convection heat transfer and parameter influence characteristics between flue gas and air under extremely high temperature conditions were investigated.The DO model in ANSYS Fluent was utilized to analyze the effects of the radiation heat transfer and absorption coefficient of high-temperature flue gas on performance of the heat exchanger,and the simulation results were compared with the S2S model and non-radiation model.The effects of wall emissivity and flue gas inlet temperature on coupled heat transfer were also studied.The results show that when the flue gas inlet temperature is 800～1 100℃,influence of radiation heat transfer is very important,but the effects of flue gas absorption coefficient and radiation can be ignored.Meanwhile,the effects of the wall emissivity and flue gas inlet temperature on the coupled heat transfer performance are very significant,the higher the wall emissivity and flue gas inlet temperature,the higher the outlet temperature of air.The research results can provide a theoretical basis for the design of silicon carbide based cathode air preheaters.
SOFCcathode air preheaterSiCheat radiationcoupled heat transfer characteristics
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