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工業技術研究院

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技術名稱: 25kW高溫燃料電池燃料回收裝置效益評估

技術簡介

高溫燃料電池發電系統以天然氣為主要應用市場之料源,採用蒸氣重組技術可獲得氫氣含量超過70%之重組氣體,使系統發電效率達50%以上。電池堆的燃料利用率通常為70%~85%,剩餘的燃料尾氣由陽極排出,進入燃燒器中轉化為熱能回收供電堆持溫使用。如將陽極尾氣燃料回收進入電堆發電使用,可降低系統燃料輸入需求,提升系統發電效率。本技術開發25kW高溫燃料電池之陽極尾氣回收裝置技術,包含燃料分流回收裝置,以及水氣循環迴路裝置。本技術應用於25kW高溫燃料電池發電系統之實際測試結果,可將系統燃料利用率由82%提升至90%,使發電效率由51.2%提高至55.8%。此外,藉由回收電堆發電運轉之產水量供給燃料重組需求,可達成系統自主水循環,無須額外建置供水裝置,降低系統建置成本。

Abstract

The main application of the Solid oxide fuel cell system is to generate power by using natural gas, which can be transform into a hydrogen-rich gas of more than 70% hydrogen content by the steam reforming process. The power efficiency of the high-temperature fuel cell system is generally more than 50% with a fuel utilization rate of 70% to 85%. The remaining fuel tail gas in the anode is then introducing into the afterburner, in which the fuel energy is converted into heat to keep the temperature of stack in the power generation process. Alternatively, the anode tail gas fuel can be recycled into the stack for power generation. In the case, the input fuel of the system is reduced so that the power generation efficiency of the system increases. The present technology develops the anode tail gas recovery device for 25kW high-temperature fuel cell system, including fuel split device and water circulation device. The experiment results show that by applying the devices the system fuel utilization rate can be increased from 82% to 90%, which causes the power efficiency of the system increasing from 51.2% to 55.8%. In addition, the demand of water for steam reforming process is met by the water circulation device which recycling the water produced by the stack. It shows that the water demand of the system is self-sufficient, i.e. no additional water supply device is need so that the cost of system can be reduced.

技術規格

本技術就固態氧化物燃料電池(Solid oxide fuel cell, SOFC)系統之陽極尾氣回收及水循環迴路設計進行開發,技術內容包含熱箱之內部熱傳應用、尾氣回收機制、水蒸發及冷凝循環迴路等設計開發,可有效提昇發電效率及降低系統建置成本。

Technical Specification

The technologies of anode exhaust gas recovery and design of water circulation loop are developed for a solid oxide fuel cell (SOFC) system. The technical content includes the internal heat transfer application of the hot box, the anode off-gas recovery mechanism, the water evaporating and condensing circulation loop designed. These technologies can effectively increase the fuel utilization to improve power generation efficiency and reduce cost of the system installation.

技術特色

1. 提出一個應用於固態氧化物燃料電池系統之陽極尾氣循環迴路 2. 設計一個被動式陽極水循環迴路,並結合系統內熱箱熱分析設計、進行水蒸發及冷凝之功能。 3. 整合尾氣回收及水循環迴路於熱箱,透過質傳平衡設計可穩定提供重組器所需之料源。 4. 上述三個技術功效,已完成實機測試,確認本技術可應用於SOFC發電系統,同時可提昇系統發電效率及降低系統建置成本。

應用範圍

傳統電廠、工業合成氣、事業及民生廢水處理廠、石業化、鋼鐵業等發電與能源相關產業。

接受技術者具備基礎建議(設備)

天然氣、沼氣及碳基燃料來源

接受技術者具備基礎建議(專業)

燃料電池系統開發、熱工流體組件及系統開發、自動化控制整合等知識

技術分類 02 F氫能與燃料電池

聯絡資訊

聯絡人:楊証皓 新能源應用技術組

電話:+886-6-3032050#535 或 Email:CHYang@itri.org.tw

客服專線:+886-800-45-8899

傳真:+886-6-3032723

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