研究生: |
廖崇廷 Chung-Ting Liao |
---|---|
論文名稱: |
以交聯式流體化床轉化生質炭為合成氣之研究 Study on Conversion of Biochar to Syngas in Interconnected Fluidized Bed Reactor |
指導教授: |
曾堯宣
Yao-Hsuan Tseng |
口試委員: |
郭俞麟
Yu-Lin Kuo 李豪業 Hao-Yeh Lee 陳士勛 Shih-Hsun Chen |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 中文 |
論文頁數: | 129 |
中文關鍵詞: | 化學迴路氣化 、合成氣 、載氧體 、交聯式流體化床 |
外文關鍵詞: | Chemical looping gasification, syngas, oxygen carrier, interconnected fluidized bed reactor |
相關次數: | 點閱:426 下載:0 |
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氣化是一種將固液燃料轉成乾淨能源的程序,而化學迴路氣化(Chemical Looping Gasification, CLG)係應用載氧體提供晶格氧產生合成氣的程序,其優點包含(1)還原後較低溫的載氧體能循環至空氣反應器中進行放熱反應,並將高溫載氧體帶回至燃料反應器,為有效能源利用程序;(2)載氧體具有晶格氧與過渡金屬,可氣化與觸媒裂解燃料;(3)與氧氣相比,燃料較易與晶格氧進行部分氧化可提升氣體的低熱值(LHV)。
本研究以澳洲鐵礦及石英砂作為載氧體與惰性固體、蒸氣作為氣化劑,並以螺桿將生質炭以1.2 g/min速率穩定輸送至交聯式流體化床中反應。首先以固-固部份氧化(solid-solid partial oxidation)及水蒸氣氣化(steam gasification)來確認氣化方式,進一步探討空氣流量、封閉迴路氣體流量、反應溫度、蒸氣/生質炭比(S/B ratio)對氣化反應速率、系統壓力、固體循環率以及氣體組成的影響,其優化條件為空氣反應器流量7.0 L/min、封閉迴路流量3.5 L/min、燃料反應器流量2.0 L/min、反應溫度850℃,S/B Ratio為1.5,可得合成氣產率為0.12 m3kg-1,冷氣效率為21.1%。進一步設計擋板於燃料反應器中,以提高生質炭在燃料反應的滯留時間,可將合成氣產率與冷氣氣化效率分別提高至0.19 m3kg-1與34.69%。燃料反應器與空氣反應器中的載氧體以XRD、BET與SEM進行分析物化特性,顯示其可以長久使用,本研究成果可作為後續反應器改良及實廠操作參數之參考依據。
Gasification is a significant energy technology that can convert solid/liquid fuels into clean energy. Chemical-looping gasification is a combustion process with using oxygen carrier to provide lattice oxygen for producing syngas. The advantages of CLG are: (1) the reduced oxygen carrier in fuel reactor can be transferred into the air reactor to be re-oxidized and heated, resulting in efficient utilization of energy.; (2)fuels can be gasified and catalytically cracked over oxygen carrier, resulted from it can release the lattice oxygen and exhibit transition metal.; (3) comparing with oxygen gas and oxygen carrier, the partial oxidation of the fuel will be achieved easily with using lattice oxygen, where the low calorific value (LHV) of product is increased.
In this study, Australian iron ore and quartz sand were used as oxygen carrier and inert. The steam was applied for gasification, and 1.2 g/min of biochar was stably fed by screw into the interconnected fluidized bed. First, the gasification process was determined by comparing solid-solid partial oxidation and steam gasification. The effect of operation parameters (air flow rate, nitrogen flow rate of loop seal, reaction temperature, and steam-to-biomass ratio) on gasification reaction rate, pressure drop of system, solid circulation rate, and composition of exhaust was investigated in detail. The optimum conditions of this system were air flow rate at 7.0 L/min, nitrogen flow rate of loop seal at 3.5 L/min, nitrogen flow rate of fuel reactor at 2.0 L/min, reaction temperature at 850°C, and S/B Ratio at 1.5. 0.12 m3 kg-1 of syngas yield and 21.1% of cold gasification efficiency were obtained. The fuel reactor was redesigned and equipped with a sieve tray for prolonging the retention time of biochar, resulting in the syngas yield and cold gasification efficiency were increased to 0.19 m3kg-1 and 34.69%, respectively. The durability of oxygen carrier is evidenced form the characterization results of XRD, BET and SEM. The research results can be used as a reference for the improvement of system design and operation parameters of pilot.
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