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Multi-Physics Modeling Assisted Design of Non-Coking Anode for Planar Solid Oxide Fuel Cell Fueled by Low Steam Methane
Jiang Zhu,Bao-xuan Wang,Zi-jing Lin*
Author NameAffiliationE-mail
Jiang Zhu Hefei National Laboratory for Physical Sciences at the Microscale & CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China  
Bao-xuan Wang Hefei National Laboratory for Physical Sciences at the Microscale & CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China  
Zi-jing Lin* Hefei National Laboratory for Physical Sciences at the Microscale & CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei 230026, China zjlin@ustc.edu.cn 
Abstract:
Internal reformation of low steam methane fuel is highly bene cial for improving the energy effciency and reducing the system complexity and cost of solid oxide fuel cells (SOFCs). However, anode coking for the Ni-based anode should be prevented before the technology becomes a reality. A multi-physics fully coupled model is employed to simulate the operations of SOFCs fueled by low steam methane. The multi-physics model produces I-V relations that are in excellent agreement with the experimental results. The multi-physics model and the experimental non-coking current density deduced kinetic carbon activity criterion are used to examine the effect of operating parameters and the anode diffusion barrier layer on the propensity of carbon deposition. The interplays among the fuel utilization ratio, current generation, thickness of the barrier layer and the cell operating voltage are revealed. It is demonstrated that a barrier layer of 400 μm thickness is an optimal and safe anode design to achieve high power density and non-coking operations. The anode structure design can be very useful for the development of high e ciency and low cost SOFC technology.
Key words:  Carbon activity, Methane steam reformation, Di usion barrier layer, Fuel utilization ratio, Non-coking condition
FundProject:
基于多物理场模拟的低水甲烷燃料固体氧化物燃料电池的抗积碳阳极设计
朱 江,王宝轩,林子敬*
摘要:
本文采用与实验I-V曲线高度吻合的多物理场全耦合数值模型来模拟低水甲烷燃料SOFC的运行过程. 基于抗积碳电流密度实验数据推导出的动力学积碳活性判据,利用多场耦合数值模型系统研究了电池工作参数和阳极扩散阻碍层厚度对阳极积碳倾向的影响. 仿真模拟揭示了燃料利用率、电流密度、扩散阻碍层厚度和电池工作电压的相互关系. 结果表明,在阳极添加400 um厚的扩散阻碍层是实现SOFC高功率密度和不积碳运行的最优设计. 这种阳极结构设计对实现高效率低成本的SOFC技术具有重要意义.
关键词:  积碳活性,甲烷水汽重整,扩散阻碍层,燃料利用率,抗积碳条件
DOI:10.1063/1674-0068/31/cjcp1805102
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