質子交換膜燃料電池之建模及流道特性分析之研究

The Study of Build Modeling and Flow Channel Characteristic Analysis in Proton Exchange Membrane Fuel Cell

林哲緯(Che-Wei Lin)

指導教授 ： 鍾金明

健行科技大學/電資學院/電機工程所/碩士(2011年)

https://doi.org/10.6824/UCH.2011.00037

摘要

本研究運用多重物理量有限元素(COMSOL Multiphysics)分析軟體3.2b的版本，建立燃料電池蜿蜒型流道與指叉型流道的幾何模型，並改變流道尺寸而設計出14個不同尺寸的流道，分析其氧氣流量分佈與氫氣流量分佈、液態水分佈與電流密度分佈在流道與氣體擴散層的變化。由實驗結果得知增加蜿蜒型流道入口與出口端的深度與寬度，可提高氧的流量與降低液態水的產生，從而提高電流密度的分佈；而增加蜿蜒型流道的彎道數，出口端的氧氣量會降低。指叉型流道因強制對流效應的關係，氧的流量分佈均勻，且較易將液態水排除，但改變流道尺寸不會有太大的影響。由燃料電池極化特性曲線看出不同尺寸流道質傳而造成的濃度極化，因蜿蜒型流道較易受到流道尺寸的變化，而影響氧氣的流量分佈，故蜿蜒型流道較指叉型流道易發生濃度極化效應。最後本研究分析，蜿蜒型流道較適用於中小型電池，而指叉型流道因壓力的關係，較不適用於小型單電池。

關鍵字

質子交換膜 ； 燃料電池 ； 流道 ； 建模

並列摘要

The study utilize multiple physical finite element analyze software (COMSOL Multiphysics) 3.2b version to establish the geometric model of fuel cell with serpentine flow channel and interdigitated flow channel. And change the size of the design flow channel to make 14 different sizes of flow channel. Analysis the changes of the oxygen flow and hydrogen flow distribution, liquid water and electric current density distribution in the flow channel and gas diffusion layer. The results indicate that increased the depth and width of serpentine flow channel inlet and outlet side can increase the oxygen flow and reduce liquid water production, therefore, to improve the distribution of electric current density. The amount of oxygen in the outlet will reduce if the curve number of serpentine flow channel is increased. For interdigitated flow channel, due to forced convection effect, the flow of oxygen distribution is uniform, and liquid water is easy to eliminate. However, there is no significant difference for size changing of flow channel. From observation of fuel cell polarization curve via different size of flow channel which cause the concentration polarization, serpentine flow channel is more susceptible to the changes in channel size, and effect the distribution of oxygen flow. Hence, the serpentine flow channel is prone to concentration polarization effects than the interdigitated flow channel. Through this study, the serpentine flow channel is more suitable for medium and small cell, and interdigitated flow channel due to relatively large pressure, less suitable for small single cells.

並列關鍵字

Proton exchange membrane ； Fuel cell ； Flow channel ； Build modeling

參考文獻

[1] 氣候變化綱要公約資訊網http://unfccc.saveoursky.org.tw/

[2] 黃鎮江，燃料電池第三版，滄海書局，民國九十七年。

[3] 林昇佃、余子隆等，燃料電池：新世紀能源，滄海書局，民國九十五年。

[4] 林群智，「太陽能製氫技術結合燃料電池發電系統之研究」，清雲科技大學電機

工程研究所碩士論文，民國九十九年。