结构参数对甲烷内重整SOFC的影响分析
Analysis on Effect of Structural Parameters on SOFC of Methane Internal Reforming
赵婧 1武静 1李莎莎 1李鹏1
作者信息
- 1. 太原科技大学化学工程与技术学院,山西 太原 030024
- 折叠
摘要
为了深入理解甲烷直接内重整SOFC放电过程特点,获取动力学、结构参数等对电池宏观放电过程、性能的影响,建立了描述SOFC单电池中化学反应、电极反应耦联动量、热量、质量、电荷传递影响的SOFC过程模型,并通过对模型求解分析,发现在SOFC入口区域,甲烷吸热重整反应占据主导地位,在阴极气体中从靠近阴极的顶部一侧向底部一侧扩散,从而形成温度梯度,将阴极气体底部的空气温度降低到其最低值;孔隙率的增大可改善电极扩散特性,从而提高电池性能;活性表面积是在电极-电解质界面上进行电化学反应的区域,大的表面积会提供更多的反应位点,使得反应速率增大.
Abstract
In order to deeply understand the characteristics of methane direct internal reforming SOFC discharge process and to obtain the influence of kinetics and structural parameters on the macroscopic discharge process and performance of the cell,a SOFC process model was established for describing the influence of chemical reactions,electrode reaction coupling momentum,heat,mass and charge transfer in SOFC single cell,and by solving and analyzing the model,it was found that in the SOFC inlet region,methane heat absorption reorganization reaction dominated and diffused from the top side near the cathode to the bottom side in the cathode gas,thus forming a temperature gradient that reduced the air temperature at the bottom of the cathode gas to its lowest value;the increase of porosity improved the electrode diffusion characteristics,thus improving the cell performance;the active surface area is the area where the electrochemical reaction takes place at the electrode-electrolyte interface,and a large surface area encourages more reaction sites,making the reaction rate increase.
关键词
固体氧化物燃料电池/甲烷直接内重整/电化学/过程模型Key words
Solid oxide fuel cell/Direct internal reforming of methane/Electrochemistry/Process modeling引用本文复制引用
基金项目
山西省应用基础研究计划项目(201901D211296)
山西省回国留学人员科研资助项目(HGKY2019086)
出版年
2024
NETL
NSTL
万方数据