摘要
构建一个以天然气为燃料的SOFC-CHP系统,推导SOFC传热传质及电化学方程,建立各个组件的数学模型,编写计算程序,对发电功率为1kW的家用SOFC-CHP系统在设计工况下进行性能模拟并探讨不同系统参数对性能的影响。计算结果表明:在设计工况下,系统热电联供效率远高于电池单独发电的效率;此外,随着燃料入口流量的增大,系统发电功率存在一个最大值,燃料利用率与发电效率不断减小,系统热电联供效率不断增大,SOFC的温度梯度分布则越来越平缓;同时发现降低过量空气系数可以提高该CHP系统的性能。
A combined heating and power system （CHP） driven by natrual gas was established based on solid oxide furl cell （SOFC）, relevant SOFC heat and mass transfer equations as well as electrochemical equations were deduced, and component models were built and solved by FORTRAN as a tool to predict the system performance of a lkW residential SOFC-CHP system. The results indicate that the system efficiency is much higher than the generating efficiency of SOFC under the design-point condition. A maximum value of electric power appears with the increase of the inlet fuel flow, fuel utilization and electric efficiency decrease, system cogeneration efficiency experiences a rising trend, and the cell temper- ature gradient distribution becomes growingly even. Reducing the excess air ratio could enhance the system performance. The above conclusions are very useful for the design and optimization of the residential SOFC-CHP system.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2011年第4期604-610,共7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
