双结热光伏电池回收固体氧化物燃料电池余热的性能匹配研究  

Matching performances of a double-junction thermophotovoltaic cell coupled with a solid oxide fuel cell for waste heat recovery

作　　者：廖天军 樊超 庞宇[1] LIAO TianJun;FAN Chao;PANG Yu(School of Optoelectronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Department of Physics and Energy,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065 [2]重庆理工大学物理与能源系,重庆400054

出　　处：《中国科学：技术科学》2024年第9期1809-1820,共12页Scientia Sinica(Technologica)

基　　金：中国博士后科学基金面上项目(编号:2022MD713719);重庆市教委科学技术项目(编号:KJQN202201102);重庆市留学回国人才创新项目(编号:cx2021127)资助。

摘　　要：本文建立固体氧化物燃料电池(SOFC)-双结热光伏电池(TTPVs)的耦合模型,结合电化学、传热学、细致平衡理论,研究能量品位的匹配和梯级调控策略.首先,考虑多种不可逆因素对能量匹配及转换性能的影响,基于子系统的伏安特性和能量传递方程,导出耦合系统的能量匹配方程、功率密度和转换效率.其次,给定SOFC的电流密度值1.60 A cm^(-2)和温度873 K,在两个光伏子电池带隙连续变化情况下优化电压和匹配面积比,以获取局域最优功率密度和效率,进而揭示半导体的带隙对优化性能和运行条件的影响规律.结果表明,优化带隙可以获得局域最高功率密度0.920 W cm^(-2)和效率44.9%.最后,探究SOFC电流密度的变化对耦合系统性能的影响规律,通过电学、结构和光学参数的协同优化,获得耦合系统的全域最高功率密度,提供关键性能参数的优化设计判据,并与SOFC单系统的全域最高功率密度相比,功率输出密度提高了42.7%.本文所获结果优于SOFC单系统和已发表成果的结果,在钢铁、化工等行业的高品位热能回收方面具有一定应用潜力.A hybrid system integrated a double-junction thermophotovoltaic cell(TTPV)and a solid oxide fuel cell(SOFC)is established,in which the impact of the various irreversible factors on the energy conversion performance was revealed by combining the theories of electrochemical,heat transfer,and detailed-balance,thereby proposing energy grade matching and cascade control strategies.Firstly,the volt-ampere characteristics and energy transfer equations of the subsystems were derived,along with the energy balance constraint equation,power density,and conversion efficiency of the coupled system were subsequently given.Secondly,for given a current density value of 1.60 A·cm^(-2) and temperature of 873 K of the SOFC,the working voltage and matching area ratio are optimized under the continuous variation of the PV cells’band-gaps to obtain the local maximum power density and efficiency,thereby revealing the effects of semiconductors’band-gaps on the optimized performance and operating conditions.The results demonstrated that optimizing the band-gaps can achieve a local maximum power density of 0.920 W·cm^(-2) and a maximum efficiency of 44.9%.Finally,the effects of the SOFC’s current density on the local optimal performance of the coupled system were studied.Through the synergistic optimization of electrical,structural,and optical parameters,a global maximum power density of the hybrid system was obtained,and the parametric optimization design criterion was provided.The results obtained in this work are superior to those of SOFC single system and published works,and have application potential for high-grade heat energy recovery in steel,chemical,and other industries.

关 键 词：固体氧化物燃料电池 双结热光伏电池 余热回收 能量匹配 能量梯级利用 

分 类 号：TM911.4[电气工程—电力电子与电力传动]