使用碳酸鈣進行煅燒/碳化循環作用並結合水合處理以去除二氧化碳之研究

Removal of CO2 by Multiple Calcination/Carbonation Cycles of CaCO3 with Hydration Treatment

陳吳政翰(Zheng-Han Chen Wu)

指導教授 ： 王榮基

大同大學/工程學院/化學工程學系所/碩士(2007年)

摘要

為了儘可能的減少來自燃煤發電廠等污染源之二氧化碳排放，本研究使用台灣東部開採之石灰石作為含鈣吸附劑的來源，進行反覆的煅燒/碳化循環來探討石灰石對於二氧化碳的移除能力。
實驗分別在固定床反應器與流體化床反應器兩個系統下進行，並利用水合處理來增加吸附劑對於二氧化碳的反應性與耐久性。實驗參數包括吸附劑粒徑大小、碳化溫度、碳化時間、二氧化碳濃度與水合反應條件。在不同的實驗條件下求得石灰石的反覆煅燒/碳化循環的轉化率。由反覆煅燒/碳化循環反應所得到之實驗結果，與前人之經驗關係式做一比較。

關鍵字

石灰石，二氧化碳，固定床，流體化床，煅燒/碳化反應，水合作用。

並列摘要

In an effort to reduce CO2 emission from the coal-fired power plants, dry calcium-based sorbents injected into combustors has been studied. Experiments have been carried out on domestic limestones from Eastern Taiwan to determine their ability to remove CO2 in multiple calcination/carbonation cycles.
Two systems such as a fixed bed and a fluidized bed were employed to examine the capture ability. Repetitive calcination/carbonation reaction with the hydration treatment was operated to enhance the reactivity and durability of the sorbents for CO2 capture. The experimental parameters included the size of sorbent particle, the carbonation temperature, the carbonation time and the hydration treatment. Conversions for the calcination/carbonation of limestone were evaluated under different operating conditions. The empirical model for the decay of the CO2 capture capacity was presented in comparison with the experimental results.

並列關鍵字

limestones ； carbon dioxide ； fixed bed ； fluidized bed ； calcination/carbonation reaction ； hydration.

參考文獻

Abanades, J.C., ‘‘The maximum capture efficiency of CO2 using a carbonation/calcination cycle of CaO/CaCO3,’’ Chemical Engineering J., 90, 303–306 (2002).

Abanades, J.C. and D. Alvarez, ‘‘Conversion limits in the reaction of CO2 with lime,’’ Energy & Fuels, 17, 308-315 (2003).

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Alvarez, D. and J. C. Abanades, ‘‘Pore-size and shape effects on the recarbonationperformance of calcium oxide submitted to repeated calcination/recarbonation cycles,’’ Energy and Fuels, 19, 270-278 (2005).

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