基于电-化-热耦合理论对称双阴极固体氧化物燃料电池堆的电流与温度场数值模拟

doi:10.13208/j.electrochem.191105

电化学（中英文） ›› 2020, Vol. 26 ›› Issue (6): 789-796. doi: 10.13208/j.electrochem.191105

基于电-化-热耦合理论对称双阴极固体氧化物燃料电池堆的电流与温度场数值模拟

俞成荣¹^,², 朱建国¹^,^*(), 蒋聪盈²^,³, 谷宇晨²^,³, 周晔欣⁴, 李卓斌⁵, 邬荣敏⁵, 仲政³^,⁴, 官万兵²^,^*()

^1. 江苏大学土木工程与力学学院,江苏镇江212013
^2. 中国科学院宁波材料技术与工程研究所,浙江宁波 315201
^3. 同济大学航空航天工程与力学学院,上海 200092
^4. 哈尔滨工业大学（深圳）理学院,广东深圳518055
^5. 浙江浙能技术研究院有限公司,浙江杭州 311121

收稿日期:2019-11-01 修回日期:2020-02-18 出版日期:2020-12-28 发布日期:2020-03-27
通讯作者: 朱建国,官万兵 E-mail:zhujg@ujsedu.cn;wbguan@nimte.ac.cn
基金资助:
国家重点研究开发项目No(2018YFB1502600);国家自然科学基金重点项目No(11932005);宁波市重大攻关项目No(2018B10048);浙江省能源集团有限公司科技项目资助No(ZNKJ-2018-008)

Numerical Simulations of Current and Temperature Distribution of Symmetrical Double-Cathode Solid Oxide Fuel Cell Stacks Based on the Theory of Electric-Chemical-Thermal Coupling

YU Cheng-rong¹^,², ZHU Jian-guo¹^,^*(), JIANG Cong-ying²^,³, GU Yu-chen²^,³, ZHOU Ye-xin⁴, LI Zhuo-bin⁵, WU Rong-min⁵, ZHONG Zheng³^,⁴, GUAN Wan-bing²^,^*()

^1. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China
^2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
^3. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
^4. School of Science, Harbin Institute of Technology, Shenzhen 518055, China
^5. Zhejiang Energy Technology Research Institute Company Co. Ltd, Hangzhou 311121, China

Received:2019-11-01 Revised:2020-02-18 Published:2020-12-28 Online:2020-03-27
Contact: ZHU Jian-guo,GUAN Wan-bing E-mail:zhujg@ujsedu.cn;wbguan@nimte.ac.cn

摘要/Abstract

摘要：

本文基于电-化-热多场耦合理论,通过有限元方法建立了一个基于对称双阴极结构SOFC电堆单元的三维数值模型,研究了其电堆内部的电流密度分布和温度分布. 研究结果表明,气体流动方式以及集流方式影响了电解质上电流密度和温度分布：在气体进、出气口处有较大的电流密度分布;在气体共流模式下,电解质层温度分布却较均匀;在双阴极结构电池阴极侧的单一集流模式下,集流侧的电解质的平均电流密度高于另一侧.

关键词: 对称双阴极, 固体氧化物燃料电池, 多场耦合, 共流与逆流, 集流

Abstract:

Solid oxide fuel cell (SOFC) is a high-efficient clean conversion device for future energy management. Because of the low antioxidant reduction ability and complex thermal stress, the structure of traditional asymmetrical thin anode-supported planar SOFC is easily to be broken under stack operating conditions. To overcome these defects, a new complete symmetrical SOFC based on double-sided cathodes was developed. To study the influences of gas flow direction and current collection mode on the cell performance inside stack, a numerical model was established by finite element method based on the theory of electro-thermo-chemo multiphysical coupling. By applying this model, the molar fraction of gas components, current density distribution and temperature distribution in the co-flow side and the counter flow side inside a stack are calculated, and the influences of the cathodic flow mode on the gas components and cell performance are discussed. In addition, the current distribution of the cell under the unilateral current collection mode is simulated, and its effect on the cell performance inside a stack is analyzed. The results show that the current density and temperature distribution on the electrolyte are affected by the flow direction and the current collection model. Large current density distributions are observed at gas inlet and outlet. The temperature distribution on the electrolyte layer under the co-flow model is more uniform than that under the counter flow direction. The average current density on the current collecting side is higher than that on the other side under the single current collection mode. It is also found that the current density and temperature distribution on the electrolyte layer can be effectively improved by reducing the resistance of cathodic cover plate. Moreover, the current collecting position will affect the path of electrons. Thus, optimization of the current collecting position can also contribute to improve the cell output performance inside a stack. This work provides a reference for improving the electric power density and operation life of the double-sided SOFC stack.

Key words: double-sided cathodes, solid oxide fuel cell, multi-physics coupled, co-flow and counter flow, current collection

中图分类号:

TM911.4
O646

俞成荣, 朱建国, 蒋聪盈, 谷宇晨, 周晔欣, 李卓斌, 邬荣敏, 仲政, 官万兵. 基于电-化-热耦合理论对称双阴极固体氧化物燃料电池堆的电流与温度场数值模拟[J]. 电化学（中英文）, 2020, 26(6): 789-796.

YU Cheng-rong, ZHU Jian-guo, JIANG Cong-ying, GU Yu-chen, ZHOU Ye-xin, LI Zhuo-bin, WU Rong-min, ZHONG Zheng, GUAN Wan-bing. Numerical Simulations of Current and Temperature Distribution of Symmetrical Double-Cathode Solid Oxide Fuel Cell Stacks Based on the Theory of Electric-Chemical-Thermal Coupling[J]. Journal of Electrochemistry, 2020, 26(6): 789-796.

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参考文献 20

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Parameter	Value
Electronic conductivity of anode (S·m^-1)	30300
Electronic conductivity of cathode (S·m^-1)	17000
Electronic conductivity of interconnect (S·m^-1)	769000
TPB length per unit volume of anode (m·m^-3)	2.14×10⁵
TPB length per unit volume of cathode ( m·m^-3)	2.14×10⁵
Electronic transfer coefficient of anode	0.5
Electronic transfer coefficient of cathode	0.5

Parameters	Porosity	Permeability/m²	Thermal conductivity (W·m^-1·K^-1)	Thermal capacity (J·kg^-1·K^-1)
Anode active layer	0.23	1 × 10^-12	11	450
Anode support layer	0.46	1 × 10^-10	11	450
Electrolyte	-	-	2.7	550
Cathode layer	0.3	1 × 10^-12	6	430
Interconnect	-	-	20	550

基于电-化-热耦合理论对称双阴极固体氧化物燃料电池堆的电流与温度场数值模拟

Numerical Simulations of Current and Temperature Distribution of Symmetrical Double-Cathode Solid Oxide Fuel Cell Stacks Based on the Theory of Electric-Chemical-Thermal Coupling

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