瓦楞式固体氧化物燃料电池的数值研究-《郑州大学学报(工学版)》

文章信息/Info

Title:: Numerical Study of Mono-Block-la＜x＞yer-Built-Type Solid Oxide Fuel Cell

Author(s):: Jin Zunlong; Yang Youchen; Miyamoto; Yuan Lei; Yang Penghui; Wang Dingbiao;; School of Mechanical and Power Engineering, Zhengzhou University; Zhengzhou Branch of China Nuclear Power Engineering Co., Ltd.;

Keywords:: Corrugated solid oxide fuel cell; runway angle; component distribution; temperature; electrical performance

摘要:: 在控制反应面积、电极和电解液层厚度相同的前提下，建立了105º、120º、135º和150º四种不同流道角的瓦楞式固体氧化物燃料电池的三维数学模型。模拟了不同流道夹角对电池内部组分分布、最大温差和电性能的影响。模拟结果表明，流道夹角的增大对燃料流道上方阳极内部的气体传输和“拐角效应”有积极影响，但对与连接体接触的阳极内部气体扩散有抑制作用。当流道夹角从105°增加到135°时，流道夹角每增加15°，电池最大温差可降低6.18%，而电性能变化不大。流道夹角为150º的瓦楞式SOFC在拐角线处的氢气摩尔分数比105º平均高出1 1.31%。此外，还比较讨论了不同燃料和空气的入口速度对瓦楞式固体氧化物燃料电池温度分布和燃料利用率的影响。燃料入口速度的增加在不同电池长度处对反应面中心线的温度分布产生不同的影响，空气入口速度的增大会降低反应面的温度，两者均会降低燃料利用率。

Abstract:: Four the mono-block-la＜x＞yer-built-type (MOLB-type) SOFCs with different flow channel angles of 105º, 120º, 135º and 150º are modeled on the premise of the same reaction area and the thickness of electrodes and electrolyte la＜x＞yer. The effects on flow distribution, maximum temperature difference and electrochemical performance of these models by the various flow channel angles are simulated. The simulation results show that the increase of flow channel angle has a positive effect on the gas transfer and corner effect in the anode above the fuel flow channel but an inhibitory effect in the anode that is in contact with the interconnect. When the flow channel angle increases from 105° to 135°, the maximum temperature difference can be reduced by 6.18% for per 15° increase with rarely changing the electrical performance. The hydrogen mole fraction of MOLB-type SOFC with the flow channel angle of 150º is 11.31% higher than that of 105º on average at the corner line. Moreover, the influence of different fuel and air inlet velocities on temperature distribution and fuel utilization of MOLB-type SOFC are also discussed and compared. The increase of fuel inlet velocity has different influence on the temperature distribution of reaction surface at the corner line on the different cell length, and the increase of air inlet velocity directly decrease this distribution. Both of them reduce the fuel utilization.