摘要
针对固体氧化物燃料电池(SOFC)与微型燃气轮机(MGT)构成的混合分布式供能系统,首先建立了一种管式SOFC准二维数值模型,优化了辐射计算,提高了热传递模型的准确性;考虑了CO及H2同时作为燃料参加电化学反应,并完善了损失计算模型;最后采用所发展的系统性能预测模型,分别在内部重整和外部重整情况下,预测比较了两种SOFC/MGT混合系统的性能,结果表明外部重整系统在系统输出功率、CO2排放以及热应力分布方面都比内部重整系统具有优势,然而这种轻微的优势是需要额外增加外部重整器的设备投资换取的。
In a SOFC/MGT hybrid distributed energy system, the mode of internal reforming or external reforming （pre-reforming） will influence the distribution of fuel species and temperature in electrochemical reactions, and even the performance of SOFC and SOFC/MGT hybrid system. In this paper, A quasi-2 dimensional model was proposed for tubular SOFC fueled with natural gas, in which, the calculation for radiation was optimized to improve the predicting accuracy for heat transfer; both CO and H2 were considered as fuel in the cell electrochemical reactions, and the loss model was completed. Finally, the developed numerical model was adopted to forecast the performance of SOFC/MGT hybrid systems with internal or external reforming. The results show that the external reforming system is slight superior to the internal reforming system in terms of system output power, C02 emission and thermal stress distribution. However this advantage must be paid for additional cost for external reformer.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2011年第6期941-946,共6页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(50976092)
教育部留学回国人员科研启动基金2008
关键词
固体氧化物燃料电池
分布式能源系统
内部重整
外部重整
性能分析
solid oxide fuel cell
distributed energy system
internal reforming
external reforming
performance analysis
