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  • 學位論文

旋轉填充床中醇胺混合深共熔溶劑捕獲二氧化碳與其模擬

Simulation and Experiment of CO2 Capture by a Mixture of Alkanolamine and Deep Eutectic Solvent in a Rotating Packed Bed

指導教授 : 陳昱劭

摘要


本研究於旋轉填充床中利用化學吸收法捕捉二氧化碳,吸收劑為2-甲基乙醇胺(2-methylamineethanol, MMEA)混合深共熔溶劑(deep eutectic solvent, DES)與水,其中深共熔溶劑為氯化膽鹼/乙二醇,探討轉速、氣體流率、MMEA濃度及吸收劑中深共熔溶劑與水在不同比例下,觀察二氧化碳移除率與KGa的變化,並利用Aspen Plus及理論法進行再生程序模擬探討醇胺混合非水溶劑之再生能耗,計算不同配方下的再生能耗,找出最佳吸收配方與操作條件,最後再與其他文獻做比較。 實驗結果顯示,移除率隨著醇胺濃度提升而增加,隨氣體流率增加而下降, 在600~1800 rpm時,移除率隨轉速上升。在60wt% MMEA水溶液混合深共熔溶劑中,深共熔溶劑含量由0wt%增加至30wt%時,移除率隨之上升,但若繼續增加至40wt%時,移除率則會下降。模擬再生程序結果顯示,Aspen Plus與理論方法計算再生能耗之結果相近,再生能量皆隨吸收劑中醇胺濃度及深共熔溶劑提升而下降。 綜合吸收劑實驗與再生能耗計算之結果,本實驗最佳吸收劑配方為60wt% MMEA/30wt% DES/10wt% H2O,在氣體流率為50 L/min、液體流率為0.1 L/min、溫度為50°C及轉速2400 rpm,移除率及KGa可達93.36%和10.5 1/s,移除率及KGa比30wt% MEA水溶液分別高37.6%和200%,再生能量則可由3.57 GJ/ton CO2降至2.09 GJ/ton CO2,此結果顯示MMEA水溶液混合深共熔溶劑在旋轉填充床中捕捉二氧化碳有極大的潛力。

並列摘要


In this study, a mixture of 2-methylethanolamine (MMEA) solution with deep eutectic solvent (DES) of choline chloride (ChCl) and ethylene glycol (EG) was used as an absorbent to capture carbon dioxide from gas stream in a rotating paced bed. The effect of rotating speed, gas flow rate, concentration of alkanolamine and the ratio of DES and water in the absorbent on carbon dioxide removal efficiency (E%), mass transfer coefficient (KGa) was investigated. Additionally, the regeneration energy of absorbent was estimated by Aspen Plus and theoretical method. Experimental results showed that CO2 removal efficiency increased with increasing concentration of alkanolamine and rotating speed ranging between 600 and 1800 rpm, but decreased with increasing gas flow rate. Moreover, adding 30wt% DES in 60wt% MMEA solution could effectively enhance CO2 removal efficiency. Calculated results showed that specific regeneration energy of Aspen Plus and theoretical method is approximate. Specific regeneration energy decreased with increasing concentration of alkanolamine and DES. In this study, an optimum composition of absorbent of 60wt% MMEA/30wt% DES/10wt% H2O was obtained. The removal efficiency and KGa of the proposed absorbent were 93.36 % and 10.5 1/s at gas flow rate of 50 L/min, liquid flow rate of 0.1 L/min, temperature of 50°C and rotating speed of 2400 rpm. Compared with 30wt% MEA solution, the removal efficiency and KGa of the proposed absorbent were increased from 68% to 93.36% and 3.51 to 10.5 1/s while the regeneration energy can be reduced from 3.57 GJ/ton CO2 to 2.09 GJ/ton CO2. This result shows that MMEA solution mixed with DES has a great potential for CO2 capture process in a RPB.

參考文獻


王逸民,2016,旋轉填充床中以醇胺吸收劑捕獲二氧化碳之研究,中原大學碩士學位論文。
吳逸甯,2016,超重力系統中以深共熔溶劑混合醇胺吸收二氧化碳,中原大學碩士學位論文。
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