陰離子交換膜水電解單元之傳輸現象分析

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姓名

宋依亭(Yi-Ting Sung) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

陰離子交換膜水電解單元之傳輸現象分析
(Analysis of transport phenomenon in Anion Exchange Membrane Water Electrolyzer)

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至系統瀏覽論文 (2029-9-1以後開放)

摘要(中)

本研究利用COMSOL Multiphysics建構一個三維、非等溫模型，探討陰陽極皆使用多孔傳輸層作為流道的陰離子交換膜水電解單元。該模型耦合了兩相流、物種傳輸、電化學反應、離子和電子傳輸與熱傳。首先對水電解單元內部進行傳輸現象分析，包括陰極流域中的兩相體積分數分佈及熱傳分析，接著對影響水電解性能的各種因素進行參數分析，包含幾何參數、材料性質及操作參數，得出不同參數對電流密度與液體消耗的影響，以及比較2V下之氣體分佈結果，並且對參數影響電解性能之原因進行說明解釋。
由傳輸現象分析結果發現，隨著電壓增加，流道中平均H_2體積分數逐漸上升，從1.4V上升至2V，於流道出口截面之H2體積分數增加約2.8倍。此外，從陰極流域出口截面可發現H_2傾向於積聚在肋條下方的觸媒層邊緣。從溫度分佈結果可得知陽極因O_2氣泡密度較大且析氧反應有較高的過電位，因此陽極溫度的上升幅度會比陰極更顯著。此外，參數分析結果表明，提高流道孔隙率、膜含水量、操作溫度與 KOH 入口流速皆能使水電解性能提升。

摘要(英)

This study utilizes COMSOL Multiphysics to construct a three-dimensional, non-isothermal model to investigate an anion exchange membrane water electrolysis unit, wherein both the anode and cathode utilize porous transport layers as flow channels. The model integrates two-phase flow, species transport, electrochemical reactions, ion and electron transfer as well as heat transfer. Initially, an analysis of transport phenomena within the electrolysis unit is performed, including the distribution of two-phase volume fractions in the cathode flow field and thermal analysis. Subsequently, a parametric analysis of various factors affecting the performance of water electrolysis is conducted. This includes geometric parameters, material properties, and operational parameters, examining their impact on current density and liquid consumption, as well as comparing gas distribution results at 2V, and elucidating the reasons for these parameter effects on electrolysis performance.
From the transport phenomena analysis, it was found that as the voltage increases, the average H₂ volume fraction in the flow channels gradually rises, increasing approximately 2.8 times from 1.4V to 2V at the channel exit cross-section. Additionally, it is observed at the cathode flow field exit cross-section that H₂ tends to accumulate at the edges of the catalyst layer beneath the ribs. From the temperature distribution results, it is evident that the anode temperature increases more significantly than the cathode due to a higher density of O₂ bubbles and a higher overpotential of the oxygen evolution reaction. Moreover, the parametric analysis indicates that enhancing the porosity of the flow channels, membrane water content, operational temperature, and KOH inlet flow rate can all improve the performance of water electrolysis.

關鍵字(中)

★ 陰離子交換膜水電解
★ 多孔傳輸層(PTL)
★ 傳輸現象
★ COMSOL Multiphysics

關鍵字(英)

★ Anion exchange membrane water electrolyzer
★ Porous transport layer (PTL)
★ Transport phenomenon
★ COMSOL Multiphysics

論文目次

摘要 I
ABSTRACT II
目錄 IV
圖目錄 VII
表目錄 X
符號表 XI
第一章緒論 1
1.1 前言 1
1.2 水電解介紹 2
1.2.1 水電解工作原理 3
1.2.2 水電解單元之組成結構 5
1.2.3 水電解單元之極化現象 7
1.3 研究目的 9
第二章文獻回顧 11
2.1 燃料電池兩相流研究 11
2.2 水電解兩相流研究 11
2.3 陰離子交換膜FC/WE研究 13
2.4 水電解之氣泡可視化實驗與數值模擬 18
第三章理論與數值模擬 21
3.1 電化學反應 21
3.2 模型幾何 22
3.3 模型假設 24
3.4 統御方程式 24
3.4.1 質量守恆方程式 25
3.4.2 動量守恆方程式 26
3.4.3 能量守恆方程式 28
3.5 電荷傳輸 29
3.5.1 電化學動力學 29
3.5.2 電流守恆方程式 29
3.5.3 Bruggeman關係式 30
3.5.4 陰離子交換膜離子導電率 31
3.6 邊界條件與物理參數 31
3.6.1 邊界條件 32
3.6.2 材料參數 33
3.6.3 物理參數 34
3.7 數值模擬方法 35
3.7.1 網格收斂性分析 36
3.7.2 參數分析 38
第四章結果與討論 40
4.1 模型驗證 40
4.2 傳輸現象分析 41
4.3 參數分析 45
4.2.1 幾何參數 45
4.2.2 材料性質參數 48
4.2.3 操作參數 62
第五章結論與未來建議 69
5.1 結論 69
5.2 未來建議 70
參考文獻 71

參考文獻

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指導教授

曾重仁(Chung-Jen Tseng)

審核日期

2024-8-23

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