摘要
研究氨燃料固体氧化物燃料电池(solidoxidefuel cells,SOFCs)热冲击的产生机理将会给电池的温度管理、可靠性管理及电池的性能优化提供更多可能性。但由于化学、电化学的反应过程复杂、模型仿真所涉物理场较多,鲜有关于氨燃料SOFCs的仿真研究。为此,该文通过建立耦合了吸热的氨气裂解反应、电化学反应、局部电流分布、温度分布以及物质流动的仿真模型,分析了单个阴极支撑的管状直接氨气裂解SOFCs的热冲击(热应力和热对流)形成机理。研究得出,过快且不均衡的氨气裂解反应是电池局部低温产生的主要原因,这会直接造成电池整体出现376K的温差。通过采用氨气预重整的方法能使氨SOFCs在相同操作电压下温度分布更均匀,平均温度更高,在800℃的环境温度下96%预重整的氨SOFCs能将阳极的温度极值差从62.16 K降为1.0 K,电池内部的温度分布得到显著改善。该研究可为氨燃料SOFCs的热管理优化提供重要理论依据,此外,该文详细展示的氨燃料SOFCs耦合模型的建模方法可以为用其他富氢气体做燃料的SOFCs的模拟仿真研究提供思路。
Studying the thermal impact in ammonia solid oxide fuel cells(SOFCs)will provide opportunities for cells temperature management,reliability management and performance optimization.However,there has been little research conducted to investigate the thermal impacts generated due to the complicated physical fields and complex chemical and electrochemical reactions in ammonia SOFCs.For this reason,this study analyzes the thermal impacts in single direct ammonia cracking SOFCs by establishing a simulation model and coupling the endothermic ammonia cracking reaction,electrochemical reaction,local current distribution,temperature distribution and mass flow.As a result,the fast and unbalanced ammonia cracking reaction rate is the principal reason for the generating of the thermal impacts in SOFCs,and it directly causes a temperature difference of 376 K in the whole cell.Introducing the ammonia pre-reforming reaction can improve the temperature distribution.At the same operating voltage,ammonia SOFCs which introduce the ammonia pre-reforming reaction show a more uniform temperature distribution and higher average temperature.When the ambient temperature is 800℃,96%ammonia pre-reforming SOFCs will improve the temperature extreme difference in cell anode from 62.16K to 1.0K.This study can provide theoretical basis for the optimization of ammonia SOFCs thermal management,and the modeling method presented in detail in this paper can provide ideas for the simulation research of SOFCs fueled by other hydrogen-rich fuels.
作者
赖彦辰
王哲
崔大安
韩凤翚
纪玉龙
LAI Yanchen;WANG Zhe;CUI Da’an;HAN Fenghui;JI Yulong(Marine Engineering College,Dalian Maritime University,Dalian 116000,Liaoning Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2024年第1期191-202,I0016,共13页
Proceedings of the CSEE
基金
国家重点研发计划项目(2023YFB4301705)
中央高校基本科研业务费专项项目(3132023527)。
关键词
固体氧化物燃料电池
耦合建模
热冲击
温度与物质分布
氨气裂解反应
预重整
solid oxide fuel cell
coupling model
thermal impact
temperature and species distribution
ammonia cracking reaction
ammonia pre-reforming
