臺灣博碩士論文加值系統

作為氫能領域中具有潛力的相關技術，固態氧化物電池(SOC)由於高溫的操作條件使其具有優異的能源轉換效率，本研究提出燃料輔助固態氧化物電解電池(SOFEC)和固態氧化物燃料電池(SOFC)的新型高效能複合系統，在這種配置中，SOFC可供給SOFEC中電解反應以及蒸氣重組反應所需電能以及熱能，而SOFEC除了可回饋於SOFC所需燃料之外，在有利的操作條件之下，不僅可在沒有電能輸入的條件下運作，也可類似於SOFC單元一般，具有電能產出的特性，此系統將可使燃料電池熱電聯產(CHP)延伸至氫熱電聯產(CHHP)，以應用於更彈性的組合式能源生產方案，研究中設計幾項主要的操作變數，包括操作溫度、電池堆疊數、燃料以及電解使用率，就其整體氫熱電聯產效能進行評估，並透過系統模擬開發出最佳的系統架構及操作條件。模擬結果顯示，傳統熱電聯產系統於最高燃料使用率下，電效率為55.13%，熱效率為21.44%。研究所提出的三聯產系統於最大的電能需求考量中，所能產出的電效率為46.78%，並同時具有11.58%的產氫效率以及18.69%的熱效率，反之，在最大的產氫需求下，三聯產系統可獲得高達57.90%的產氫效率，並同時具有21.32%的電效率以及0.70%的熱效率。

As a promising technology in the field of hydrogen energy, solid oxide cell (SOC) has high energy conversion efficiency due to its high temperature operating condition. This study proposes a new high-performance tri-generation system based on fuel-assisted solid oxide electrolysis cell (SOFEC) coupled to solid oxide fuel cell (SOFC). In this configuration, SOFC can provide power, heat that the SOFEC required for the electrolysis and steam reforming reaction. In addition to the fuel that can be fed back to the SOFC, the SOFEC can not only operates without electrical energy but can also generate electricity like a SOFC. For the more flexible energy production strategies, it would enable the extension of combined heat and power (CHP) system to combined hydrogen, heat and power (CHHP) system. This research will design several major operational variables for the integrated system, including the operating temperature, number of cells, fuel and electrolysis utilization. The overall performance will be evaluated through system simulation, and the optimal system architecture, operating conditions will be developed. Simulation results indicate that electrical and thermal efficiency of the conventional CHP system are 59.05% and 16.80% at highest fuel utilization. Under the maximum power demand consideration, the CHHP system shows an electrical efficiency of 46.78%, simultaneously, it has a hydrogen production efficiency of 11.58% and a thermal efficiency of 18.69%. One the contrary, under the maximum hydrogen production demand, the CHHP system can obtain a hydrogen production efficiency of up to 57.90%, simultaneously, it has an electrical efficiency of 21.32% and a thermal efficiency of 0.70%.

摘　要 i
ABSTRACT ii
誌 謝 iv
目錄 v
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.3 研究動機與目的 4
1.4 章節組織 5
第二章 燃料電池系統 6
2.1 燃料電池應用於熱電聯產 6
2.2 燃料預重組器 7
2.3 SOFC 8
2.4 尾燃器 12
2.5 熱回收器 12
第三章 電解電池系統 13
3.1 電解電池應用於燃料生產 13
3.2 SOEC 16
3.3 SOFEC 17
3.4 生產燃料後續處理方法 18
第四章 燃料電池與電解電池系統之模擬 21
4.1 系統之元件原理與模擬方式 21
4.1.1 壓縮機 21
4.1.2 燃料預重組器 22
4.1.3 SOFC 22
4.1.4 SOFEC 23
4.1.5 尾燃器 23
4.1.6 熱交換器 24
4.1.7 除水器 24
4.1.8 排出器 24
4.1.9 二氧化碳吸收器 25
4.2 SOC系統之電性能及熱性能分析 25
4.2.1 電位計算式 25
4.2.2 電流計算式 31
4.2.3 燃料使用率及電解使用率 32
4.2.4 熱能計算式 32
4.2.5 系統評估方法 33
第五章 SOFC熱電聯產系統之設計與結果分析 36
5.1 參數設定 36
5.2 蒸氣式重組器結果分析 37
5.3 燃料電池結果分析 39
5.4 熱電聯產系統結果分析 44
第六章 SOFEC三聯產系統之設計與結果分析 49
6.1 參數設定 49
6.2 電池堆結果分析 50
6.3 三聯產系統結果與分析 53
第七章 結論與未來展望 82
7.1 結論 82
7.2 未來展望 82
參考文獻 83

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