三維指叉式質子交換膜燃料電池的傳輸機制和性能分析

Transport mechanisms and performance simulations of a PEM fuel cell with interdigitated flow field

蘇建誌(Chien-Chih Su)

指導教授 ： 邱青煌

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2009年)

https://doi.org/10.6827/NFU.2009.00079

摘要

本研究係藉由有限元素分析軟體COMSOL Multiphysics來建立質子交換膜燃料電池的數值模型。此模型為三維、單相、等溫、多物種傳輸之數值模型。計算的區域包含質子交換膜以及陽極和陰極的氣體流道、氣體擴散層、觸媒層。
此研究中使用連續方程式、Navier-Stokes方程以及Brinkman 方程來描述反應氣體以及生成物在氣體流道、氣體擴散層、觸媒層的流動情形和壓力分佈。再透過Maxwell-Stefan方程來計算反應氣體的擴散及對流以及反應氣體的生成和消耗情形。固相電位和膜相電位則是利用電荷守恆方程式來求得。此外在陽極和陰極觸媒層上所產生的電化學反應則是利用Butler-Volmer方程來描述。主要研究的目的為比較指叉式流道、直通式流道以及漸縮式流道三種不同的流道類型的傳輸機制，及對於氣體的分佈情形以及功率密度的影響。並針對指叉式流道的結構參數和操作參數進行分析以及探討。

關鍵字

質子交換膜燃料電池 ； PEMFC ； 數學模型

並列摘要

The study simulates the distribution of concentration, pressure and local current density in a single proton exchange membrane fuel cell by using finite-element analysis software COMSOL Multiphysics. This mathematical model is three-dimensional, single-phase, isothermal and hybrid multi-component transport model. The calculated region has contained the proton exchange membrane as well as anode and cathode gas flow channel, gas diffusion layer, catalyst layer. In the research is used the continuity equation and Navier-Stokes equation, Brinkman equation to describe the flow of reactant gas and production in the gas flow channels, gas-diffusion electrodes, catalyst layers, flowing and the pressure distribution. The Maxwell-Stefan diffusion equation is used to study species transport of multi-component mixture gas. The potential for both solid and electrolyte phase are obtained by using charge conservation equation. The Butler-Volmer equation is used to describe electrochemical reaction for the domain in catalyst layer.
The purpose of this study is to develop a three dimensional model for the simulation of PEMFCs, which can be applied to investigate the performance of fuel cells with the interdigitated and conventional flow fields with convergent channel configuration , such as the reactants mass concentration and velocity distribution, the polarization curve, the output power density and so on.

並列關鍵字

Proton exchange membrane fuel cell ； Numerical model

參考文獻

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