In order to uncover the inner working mechanism and performance of solid oxide fuel cell (SOFC) with biomass gasification syngas as fuel, a two dimensional SOFC multi-physical field model is established. This study makes up for the deficiency that the previous studies of coupling biomass gasification unit and SOFC stack mostly stay at the system level. The results show that the SOFC fueled by the syngas produced from gasification of biomass with steam as the agent has the best performance. The peak power density could achieve approximately 10240 W m⁻². With the improvement of operating temperature, the peak power density of SOFC will be increased. At the temperature of 1123 K, the peak power density could achieve about 15128 W m⁻². The average reaction rate of water gas shift (WGS) reaction is −29.73 mol m⁻³ s⁻¹ when the operating temperature is 1123 K. This indicates that the WGS reaction will proceed in reverse direction at high temperatures, thereby reducing the hydrogen concentration. In addition, increase in the anode flux and decrease in the cell length lead to the increase of SOFC current density. In general, this work could provide guidance for the optimization and practical application of SOFC using biomass syngas as fuel.

为了揭示以生物质气化合成气为燃料的固体氧化物燃料电池（SOFC）的内部工作机理和性能，建立了二维SOFC多物理场模型。本研究弥补了以往生物质气化装置与SOFC电堆耦合研究多停留在系统层面的不足。结果表明，以蒸汽为燃料的生物质气化产生的合成气为燃料的SOFC性能最佳。峰值功率密度可以达到大约 10240 W m ^-2。随着工作温度的提高，SOFC的峰值功率密度会增加。在1123 K的温度下，峰值功率密度可达到约15128 W m ^-2. 当操作温度为1123 K时，水煤气变换(WGS)反应的平均反应速率为-29.73 mol m ^-3  s ^-1。这表明WGS反应在高温下会逆向进行，从而降低氢气浓度. 此外，阳极通量的增加和电池长度的减少导致 SOFC 电流密度的增加。总的来说，这项工作可以为以生物质合成气为燃料的 SOFC 的优化和实际应用提供指导。