平板式SOFC單電池堆性能量測：棋盤狀流道尺寸效應

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黃士峻(SHIH-CHUN HUANG) 查詢紙本館藏

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能源工程研究所

論文名稱

平板式SOFC單電池堆性能量測：棋盤狀流道尺寸效應
(Performance Measurements of A Single-Cell Stack of Planar SOFC：The Size Effect of Pin-type Flow Channels)

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摘要(中)

本研究建立一套高溫固態氧化物燃料電池(solid oxide fuel cell, SOFC)性能測試平台，並針對不同棋盤狀流道設計之單電池堆，進行一系列的電流-電壓曲線量測與分析，以獲得不同流道設計對電池性能有何影響的結果。SOFC單電池堆由一40 mm x 40 mm陽極支撐PEN (positive electrode- electrolyte-negative electrode)、加上集電層(陽極為鎳網而陰極為白金網)，以及自行利用陶瓷材料加工的不同棋盤狀流道板所組構而成。所探討的流道設計參數，包括三個不同格狀突出物寬度與流道寬度總和(Wpitch = 2 mm, 4 mm, 10 mm），以及三個不同流場板中格狀突出物寬度與流道寬度之比值(f = 0.33, 0.5, 0.66）。實驗結果顯示，當f = 0.5，並將電池操作溫度控制在850 oC時，電池堆的峰值功率密度值(Peak power density, PPD)會隨Wpitch之減小而增大。PPD值在Wpitch = 2 mm比在10 mm Wpitch提昇了約7.2 %，故採用越小的Wpitch，有助於使反應氣體均勻分佈於PEN表面。此外，當Wpitch固定時，則f值越小，PEN與反應物接觸的有效面積越大，因此PPD值在f = 0.33比f = 0.66可提升約2.4 %。最後本論文也將統合分析操作條件，如反應物質量流率以及操作溫度對電池性能的影響。

摘要(英)

This thesis aims to establish a high-temperature solid oxide fuel cell (SOFC) performance testing platform, so that a series of current-voltage curve measurements and analysis for a single-cell stack using different designs of flow distributors can be performed. The SOFC single-cell stack consists of a 40 mm x 40 mm anode-support PEN (positive electrode-electrolyte-negative electrode), two collector layers (nickel meshes for the anode and platinum meshes for the cathode), and home-made pin-type flow distributors with various sizes. Two key geometrical parameters of the pin-type flow distributors, including three different pitch widths (Wpitch = Wpin + Wchannel = 2 mm, 4 mm, 10 mm) and three different values of the pin-width fractions (f = Wpin / Wpitch = 0.33, 0.5, 0.66), are discussed. Experimental results show that the stack performance, i.e., peak power density (PPD), increases with decreasing Wpitch when f fixed as 0.5, and the stack was operated at 850 oC. It is found that flow distribution in the flow distributors with Wpitch = 2 mm is more uniform than that of the case with Wpitch = 10 mm and thus a 7.2 % increase of the PPD can be obtained. Furthermore, the flow distributors with a smaller f can increase the contact area between the reactants and PEN so that the stack using the flow distributors with f = 0.33 can produce a PPD 2.4 % higher than that of the case with f = 0.66. Finally, the effects of the operator conditions, such as the flow rate of the reactants and the operating temperatures, on the stack performance are also discussed.

關鍵字(中)

★ 棋盤狀流場板
★ 平板式SOFC
★ 峰值功率密度
★ 電池性能
★ 電池堆

關鍵字(英)

★ Planar SOFC
★ single-cell stack
★ pin-type flow distributor

論文目次

中文摘要 I
Abstract II
致謝 III
目錄 IV
圖表目錄 VII
第一章前言 1
1.1 研究動機與目的 1
1.2 問題所在 2
1.3 解決方法 4
1.4 論文概要 4
第二章文獻回顧 8
2.1 SOFC操作原理與發展 8
2.1.1 電極 8
2.1.2 電解質 9
2.1.3 密封材料 10
2.1.4 PEN種類 11
2.1.5 集電層概念運用 12
2.1.6 SOFC的發展歷程 12
2.2 燃料電池的開路電壓 13
2.3 燃料電池的極化現象 14
2.4 流道設計 16
2.5 肋條與流道尺寸的影響 17
2.6 對沖流以及棋盤狀流道的使用 19
第三章實驗設備與量測方法 30
3.1 單電池堆性能測試平台 30
3.1.1 電化學電池 30
3.1.2 測試儀器 30
3.1.3 氣體控制系統 30
3.1.4 電池堆結構 31
3.2 實驗參數設定與實驗流程 32
3.3 不同棋盤狀流道製作及設計 33
3.3 單電池堆測試平台遭遇之問題 35
第四章結果與討論 47
4.1 實驗參數靈敏度測試 47
4.1.1 訊號擷取率 47
4.1.2 陽極還原時間 47
4.2 棋盤狀流道參數對電池性能之影響 48
4.2.1 Wpitch效應 49
4.2.2 f值效應 49
4.3 反應物流率效應 50
4.3.1 H2流率對電池性能的影響 50
4.3.2 空氣流率對電池性能的影響 51
4.3.3 N2流率對電池性能的影響 52
4.4 溫度效應 53
4.5 由PEN分析流場分佈 54
4.6 相異接線方法比較 55
第五章結論與未來工作 71
參考文獻 73

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指導教授

施聖洋(Shenqyang Shy)

審核日期

2009-8-21

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