摘要
依据同时考虑电化学及热平衡耦合的二维模拟软件 ,计算了薄膜钇稳氧化锆 (YSZ)中温燃料电池在不同工作条件下的稳态特性 .通过电流～电压关系参数进行自拟合实验 ,格点选取由平衡收敛性和计算效率而得 ,研究了不同连接体、气流流向设计等工作条件下的温度场 ,给出了不同工作温度下输出功率及电池效率与工作电压的关系 .对温度场的分析表明 :电池板内最高温度及最大温差以并流为最小 ,交叉流为最大 ,并流是最好的气流流向设计 .与以陶瓷材料作连接体相比 ,使用金属连接体能显著减小热应力和电池板内最高温度 ,受益最大的是交叉流 ,其最高温度及最大温差均小于陶瓷连接体的并流设计 .不同的气流流向对于输出功率及电池效率影响很小 ,对并流和金属连接体组合 ,给出了工程设计的燃料分布、电流密度。
With a coupled 2D electrochemical and thermal modeling software, the characteristics of the steady state operation of the intermediate-temperature fuel cell with thin yttria-stabilized zirconia(YSZ) electrolyte was analyzed. The parameters of I-V equation were obtained from fitting the experiment results and the choice of grid points was determined by balancing the accuracy requirement and computational efficiency. The temperature fields at different operation circumstances such as flow designs, material choices for interconnect, were examined. The dependences of the output power and cell efficiency on the operating voltage at different temperatures were studied. Based upon the analysis of the temperature profile, it is demonstrated that the maximum temperature and temperature gradient are both the lowest for the co-flow design, and are the hignest for the cross-flow design;co-flow is the best flow design.Comparing with ceramic interconnect, using metallic interconect can greatly reduce the thermal stress and the maximum temperature of the cell. The cross-flow design benefits the most from using metallic interconnect and its maximum temperature and temperature gradient become lower than those of the co-flow design with the ceramic interconnect. However,the output power and cell efficiency are similar for different flow patterns. The current density, temperature gradient, Nernst potential and fuel distributions at a typical operating situation are also shown for the co-flow fuel cell with metallic interconnect.
出处
《电化学》
CAS
CSCD
2002年第4期445-451,共7页
Journal of Electrochemistry
基金
中国科学技术大学高水平大学建设重点基金(KeyFundofUSTC)资助项目
