化石燃料的大量使用增加CO2排放，CO2等溫室氣體引起的全球暖化逐漸引起環境災害和經濟損失。化學迴路燃燒（Chemical Looping Combustion，CLC）是一種具CO2內分離特性且不需額外能量的燃燒程序，為潔淨高效的碳捕獲程序。載氧體為實現化學迴路燃燒的關鍵，天然鐵礦因具有環境友好和價格低廉等特性而被廣泛關注，應用鐵礦石載氧體能降低CO2捕獲成本，具有良好的工業應用潛力。
本研究是以1kWth交聯式流體化床反應器的流體化情形以及轉化效能為主軸，使用澳洲鐵礦為載氧體，分為兩大部分，第一部分為交聯式流體化系統穩定性測試，測定不同溫度下(1123K、1173K、1223K)三股氣流分別通入燃料反應器、空氣反應器與隔離器，穩定1小時後獲得最小流化氣體流速，作為啟動化學迴路的操作基礎。第二部分為熱力學反應性測試，探討一氧化碳濃度、溫度及循環率對轉化率之影響，推算出封閉迴路(Loop seal)的流動狀態、燃料反應器返料腿與旋風分離器的串混情況以及固體循環率(Circulation rate)，以推導出以天然礦石在1kWth交聯式流體化床反應器的反應速率式。最後，進行100小時連續操作評估1kWth交聯式流體化床反應器的長時間穩定性。在實場運轉考量時，載氧體的穩定反應性及程序的長時間穩定性是化學迴路技術的首要關鍵，分析研究的過程中，顯示燃料反應器與空氣反應器壓力差值以及氧氣濃度減低量可判斷系統的流體化運行的狀態，相關結果可直接應用於化學迴路燃燒試驗場。

Using of fossil fuel exacerbates CO2 emission to the atmosphere, and the global warming phenomenon caused by greenhouse gases will result in serious disasters and economic losses. Chemical looping combustion (CLC) is an attractive combustion process to separate CO2 from exhaust without extra energy consumption, oxygen carrier play the key role to achieve CLC process. The CO2-capture cost can be reduced with using the natural iron ore as oxygen carrier due to its environmental friendliness and low price. It thus exhibits a great prospects for industrial application.
This work was focused on the 1kWth interconnected fluidized bed system and the fuel conversion over it with using Australia iron ore as oxygen carrier. There were two major parts in this study, the first section is the stability of interconnected fluidized bed system, three designed gas streams were respectively induced into fuel reactor (FR), air reactor (AR), and loop seal (LS) under different temperatures (1123K, 1173K, 1223K) to maintain the stable fluidization over one hour. The minimum fluidization gas flow rates were obtained from this experiment, which were applied as start-up parameters for CLC system. In the second part, the thermodynamic reactivity was evaluated under variant conditions, such as effects of CO concentration, temperature, and solid circulation rate. The flow situation of LS, leakage rate from FR to cyclone, solid circulation rate were estimated to conduct the reaction rate of natural iron ore and CO in this CLC system. Furthermore, a 100-hour operation of this CLC system was carried out to evaluate its stability, the stable reactivity of oxygen carrier and long-term stability of process are the most important key factors to achieve in the practicality of scale-up CLC system. According to the analysis of data, the pressure drop of AR and FR, and the decrease in oxygen concentration of AR can be used as indexes of fluidization stability. These results can be applied in the CLC pilot directly.

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