本研究探討應用稻殼灰製備載氧體之可行性評估與交聯式流體化床設計。以稻殼灰燼製成鐵矽載氧體可達到農業廢棄物再利用與降低化學迴路程序的載氧體製備成本的目的，並添加鹼金屬與鹼土金屬修飾載氧體，可進一步增進其在化學迴路燃燒程序之反應活性。經由機械混合法混合鐵、稻殼灰與改質金屬後壓錠造粒，使用0.177-0.297 mm的粉體於半套式流體化床進行化學迴路燃燒反應。研究中分析鐵矽化合物的生成與特性，並摻混氧化鈣進行改質以增進反應活性。利用熱重分析儀測試反應活性，分別以10%合成氣進行還原、空氣進行氧化，以初步評估載氧體之反應特性。最後於900℃下，在流體化床進行多迴路測試觀察鐵矽鈣載氧體穩定性，顯示鐵矽鈣載氧體具有穩定且良好的反應性。
動力學部分，實驗結果顯示系統在短時間內為擬穩態的連續式攪拌槽反應器，依據此設計方程式來擬合實驗數據，計算還原反應的動力學參數。結果顯示還原反應為擴散控制反應，此時氧化鐵的反應級數為2，其為影響還原速率的主要因素。
交聯式流體化床設計，在本研究中主要進行冷模的設計與組裝，由燃料反應器、氣體密封迴路、空氣反應器與旋風分離器所構成1 kW的反應系統，藉由分析各單位的壓力降，計算出系統內的氣固流量，並探討氣體流速與固體量對於運行的影響。在燃料反應、氣體密封迴路與空氣反應器流量依序為10 L/min、6 L/min與20 L/min時，可達穩定運行的狀態。氣體流速與固體量對於運行的影響

In this work, the feasibility of the application of rice husk ash as inert support for iron-base oxygen carrier for chemical looping combustion (CLC) process and the design of inter-connected fluidized bed were investigated, respectively. The purposes of application of husk ash are the reuse of agricultural waste and the decrease in manufacture cost of oxygen carrier. The iron-based oxygen carriers with particle size between 0.177-0.297 mm were obtained via mechanical mixing, pelleting, and crushing processes, respectively. The properties of ferrosilicon oxide during CLC reaction were characterized and the effects of metal additives of oxygen carrier on CLC activity were investigated. The redox activities of oxygen carrier were first evaluated in a thermo-gravimetric analysis (TGA) system, where 10 vol% of syngas and air were applied as reductant and oxidant, respectively. The ferrosilicon oxygen carrier was further tested in a fluidized bed at 900℃ for 11h continuously. The results indicated that this oxygen carrier exhibits good reactivity and thermal stability.
In part of CLC kinetic analysis, the experiment data in reduction stage indicated the reaction behavior is similar to a steady state of continuous stirred tank reactor in the beginning period. The design equation is thus used to fit the experimental data for the estimation of kinetic parameters. The results showed the reduction from Fe2O3 to Fe2O3 in CO atmosphere is a diffusion-controlled reaction. The reaction order of Fe2O3 is 2 and the reduction rate is majorly affected by the concentration of oxygen carrier.
The third part of this work was focused on the design of inter-connected fluidized bed for CLC system. A cold model of 1 kW system is designed and established completely, consisting fuel reactor (FR), loop-seal (LS), air reaction (AR), and cyclone. The effects of gas flow rate and solid content on circulation of oxygen carrier were studied by analyzing the pressure drop of each part. A stable circulation of oxygen carried can be reached with applying 10, 6, and 20 L/min in FR, SL, and AR, respectively.

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