嵌入式碳纖維板於醇胺類系統之二氧化碳吸收效率提升

本研究主要是針對薄膜氣體吸收系統進行理論分析，利用一維理論模型描述系統中氣體溶質於氣、液兩相內之濃度分佈式，所推導出之解題流程適用於平板之順流與逆流系統。建模過程中使用朗吉庫塔法進行數值分析。實驗的操作參數以改變不同流率、濃度、加裝碳纖維板等進行討論與實驗模擬。吸收效率、吸收速率、平均謝塢數的結果則以實驗和理論之值進行誤差分析與討論。以本論文所推導之理論為基礎，以醇胺對二氧化碳之化學吸收作廣泛的討論，結果發現，不論是何種類型之吸收，增加液體的流率或或以逆流的形式進行實驗皆能增加二氧化碳之吸收效率，而各種濃度變化的趨勢，也都能符合吾等之預期。此外，由平板吸收實驗所得之結果更可以確定本論文所提出的數學模型之正確性。實驗與模擬結果皆也顯示嵌入溝渠式碳纖維板後的確能提升系統透膜吸收效率，最高可以達到40.56%的增益率，而實驗與理論的相對誤差最高為3.95。本研究以操作在低體積流率之設備為主，除了有效利用擾流因子的設定已降低操作成本外，改良之設計更顯著提升了吸收效率。

關鍵字

二氧化碳吸收；平板薄膜系統；數值解；薄膜吸收

並列摘要

The carbon dioxide absorption by amine in a parallel-plate gas-liquid membrane contactor of concurrent- and countercurrent-flow was investigated theoretically and experimentally in this study. The numerical method applied in modelling carbon dioxide absorption process in the system was the Runge–Kutta method with shooting method. The absorption efficiency enhancement is represented graphically and validated by experimental results. The absorption efficiency, average Sherwood number and concentration distributions varies with absorbent flow rate, gas feed flow rate and inlet CO2 concentration in the gas feed are predicted and correlated. The correlation is useful in predicting the mass transfer coefficient for carbon dioxide absorption by amine in flat-plate flow channels. The comparison of numerical solutions with experimental data validates the numerical model of the system is within acceptable accuracy. The new design of eddy promoter with carbon fiber attached in flow channels can effectively enhance the carbon dioxide absorption efficiency among the operating conditions set in this study.

並列關鍵字

CO2 absorption ； Runge–Kutta method ； carbon fiber ； eddy promoter

參考文獻

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嵌入式碳纖維板於醇胺類系統之二氧化碳吸收效率提升

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