本研究之主要目的是探討兩種不同來源之氧化鐵作為載氧體之活性相並透過鈣改質提升整體之反應性，於移動床式燃料反應器應用化學迴路程序處理固體燃料。選用高含量固定碳之木炭與載氧體進行化學迴路燃燒程序，探討使用鈣改質電爐石/氧化鋁以及鈣改質氧化鐵粉/氧化鋁對木炭之反應及空氣汙染評估。透過添加氫氧化鈣以及氧化鋁載體改善電爐石於長時間操作下之反應性及穩定性，藉由物理與化學特性測試，以20 wt. %氫氧化鈣改質之鐵係載氧體與合成氣具有最佳之反應性，且鈣改質電爐石/氧化鋁相較鈣改質氧化鐵粉/氧化鋁載氧體具有較高之機械強度及較低磨耗。應用鈣改質鐵係載氧體進行化學迴路燃燒程序，探討不同反應溫度，載氧體流量及氣化劑流量之影響。較高的反應溫度可促進氣化反應的發生，使載氧體及燃料轉化率隨之提升；載氧體流量加快會降低木炭和載氧體於反應器之滯留時間，造成載氧體轉化率降低，但對於燃料轉化率影響不顯著；而增加氣化劑流量，載氧體及燃料轉化率也會隨之增加。於最佳操作參數下，鈣改質電爐石/氧化鋁對燃料轉化率為31.26% 較鈣改質氧化鐵粉/氧化鋁之26.87% 高。結果顯示，工業廢棄物(電爐石)可作為載氧體之活性相且經過改質後之反應性較商用氧化鐵粉佳，為一項具備低成本，高反應性之鐵係原料。為隨後針對鈣改質鐵係載氧體於化學迴路燃燒程序進行氮氧化物及二氧化硫濃度排放之檢測，結果顯示氮氧化物及二氧化硫濃度均低於理論計算，證實化學迴路程序可有效降低空氣污染之排放。

Chemical looping combustion was conducted in a moving bed reactor with two kinds of iron source as reactive phase in oxygen carriers and modification with Ca(OH)2 was used to enhance reactivity with fuels. In the moving bed reactor, calcium modified electric arc furnace slag (EAF-slag)/Al2O3 and calcium modified iron oxide powder (Fe2O3)/Al2O3 were selected as oxygen carriers. The reactivity and air pollutant analysis of Ca-modified iron-based oxygen carriers reacting with BC-charcoal were conducted. The reactivity and stability of EAF-slag during long time operation test improved by adding Ca(OH)2 and Al2O3. According to the TGA test, the iron-based oxygen carriers with 20% Ca(OH)2 fraction displayed better reactivity with syngas, and Ca modified EAF-slag/Al2O3 oxygen carriers showed better mechanical properties than Ca modified Fe2O3/Al2O3.
In this research, BC-charcoal combustion was conducted with Ca-modified iron-based oxygen carriers, and the effects of reaction temperatures, oxygen carriers flow rates and steam flow rates were investigated. The fuel conversion and oxygen carriers conversion increased with reaction temperature, and the same trend was observed for steam flow rate. However, the fuel conversion and oxygen carriers conversion decreased with an increasing oxygen carriers flow rate. Under optimal operation conditions, the fuel conversion was 31.26% for Ca modified EAF-slag/Al2O3 which was higher than for Ca modified Fe2O3/Al2O3. Furthermore, the air pollutant analysis indicated that the emission of NOx and SO2 were very low for both Ca-modified iron-based oxygen carriers, which implies that the chemical looping combustion process could reduce emission of air pollutants.

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