摘要
建立了一个既可以描述管式固体氧化物燃料电池的稳态性能又可以描述其非稳态性能的数学模型。考虑了造成电池输出损失的三种极化现象:欧姆极化、活化极化和浓差极化。在传热模型中,除了考虑传导和对流换热外,也考虑了电池和空气进气管之间的辐射换热。分析了平均电流密度、燃料和空气进口温度和流量对电池稳态和非稳态性能的影响。计算结果表明,稳态下电池固体部分的最高温度位于电池的中部;对于同一幅度的平均电流密度的阶跃变化,电池从最初的稳态到达新的稳态所需的响应时间随各种操作参数的改变而变化。
A model was developed to simulate the operation of a tubular solid oxide fuel cell at the steady and transient operation states. The model included all three polarizations： ohmic, activation and concentration polarization. Radiation between cell tube and air feed tube and heat transfer by convection and conduction were also included in this model. The effects of the average current density, the inlet flow rate and inlet temperature of the fuel and oxidant on the performance of the steady and transient operation were analyzed in detail. Numerical results show that the middle part of the SOFC has a relatively higher temperature than that at two ends of fuel cell. To the same step increase in cell current density, the response time required to the new steady state is different as different operation parameters changing.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第20期91-98,共8页
Proceedings of the CSEE
关键词
管式固体氧化物燃料电池
电化学反应
传热传质
非稳态
tubular solid oxide fuel cell
electrochemical reaction
heat and mass transfer
transient simulation
