CFD analysis for catalytic reactions and transport processes in anodes of IT-SOFC

YANG Chao; YANG Guogang; YUE Danting; YUAN Jinliang

doi:10.3969/j.issn.0438-1157.2013.06.041

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CFD analysis for catalytic reactions and transport processes in anodes of IT-SOFC

更新时间：2025-12-10

- CFD analysis for catalytic reactions and transport processes in anodes of IT-SOFC
- CIESC Journal Issue 6, Pages: 2208-2218(2013)
- 作者机构：
  
  1. 大连海事大学轮机工程学院,辽宁,大连,116026
  2. 瑞典隆德大学能源科学系,隆德,瑞典,22100
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.06.041
  CLC： M911.47
- Online First：05 June 2013，
  
  Published：05 June 2013
- 稿件说明：
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YANG Chao, YANG Guogang, YUE Danting, et al. CFD analysis for catalytic reactions and transport processes in anodes of IT-SOFC[J]. CIESC Journal, 2013, (6): 2208-2218.
DOI：

YANG Chao, YANG Guogang, YUE Danting, et al. CFD analysis for catalytic reactions and transport processes in anodes of IT-SOFC[J]. CIESC Journal, 2013, (6): 2208-2218. DOI： 10.3969/j.issn.0438-1157.2013.06.041.

摘要

固体氧化物燃料电池(SOFC)具有效率高、污染低、对燃料适应性好、功率大等特点。其性能与工作状态受发生在多孔阳极的化学反应与多种传递过程耦合的影响。基于流体力学方程组和多步基元化学反应模型

建立了描述上述耦合特性的三维数学模型

并自编程序求解分析。结果显示:重整反应主要发生在靠近通道进口的多孔阳极

表面成分Nis的覆盖率占70%～80%

其他主要表面成分为COs占20%～25%

Hs占6%

Os占1.5%; Nis随工作温度升高而增加;加强吸附基元反应会提高燃料利用率和工作温度;渗透率增加会提高反应气体在多孔介质内的传递效果

但催化反应会因接触不充分而减弱。通过考虑基元反应机理研究表明

在微观层面

催化剂Ni利用率不高

催化反应受温度、化学反应速率常数、孔隙率等参数影响较大。

Abstract

Solid oxide fuel cell (SOFC) is of advantages of high efficiency

low pollution

flexibility of usable fuel types and high power

etc.Its performance and work condition is strongly affected by electro-chemical reactions coupling with various kinds of transport processes occurring in the porous anode.In this work

a 3D model is developed to describe the coupling processes based on a in-house code program.A mechanism with 42-step elementary reactions was used to evaluate the catalytic surface reaction taking place in porous anode of SOFC.The results indicate that reforming reaction providing H2 and CO for electrochemical reaction consumes heat produced by electrochemical reaction and occur mainly in near inlet side of anode.The 70% to 80% of surface coverage in anode is covered by Nis

20% to 25% by COs

6% by Hs and 1.5% by Os

and it is also found that the low utilization of Nis catalytic surface means in sufficient usage of fuel.The coverage of surface species depends on operating temperature

Nis coverage increases with increasing temperature while Hs

COs and Os decrease.Reaction rate constant can affect specific coverage and operation temperature in some degree

higher rate constant of elementary reaction can make increase fuel consumption and operation temperature.So

it is possible to go up the utilization rate of fuel by improving some steps in elementary reactions.Gas transport is improved by increasing permeability that can not enhance catalytic surface reaction.

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