二氧化碳吸收於雙件式平板型薄膜模組之效率提升研究

Theoretical and Experimental Studies of Carbon Dioxide Absorption in Double-Unit Flat-Plate Membrane Contactors

邱崇寶(Chung-Pao Chiou)

指導教授 ： 何啟東

淡江大學/工學院/化學工程與材料工程學系碩士班/碩士(2021年)

https://doi.org/10.6846/TKU.2021.00364

摘要

本研究主要是通過實驗和理論針對薄膜氣體吸收系統進行分析，以胺溶液吸收CO2於雙件式平板型膜組之順流和逆流操作，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，並利用四階Runge-Kutta方法進行數值分析，實驗的操作參數以改變不同胺溶液之吸收劑流率、進氣CO2濃度，及崁入3D紊流促進器等進行討論及實驗模擬。同時也可獲得平均謝塢數的回歸經驗式，吸收速率的結果，可用於計算雙件式平板型薄膜模組中CO2吸收的質傳係數。
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討論，結果發現，增加液體的流率或以逆流的形式進行實驗皆能增加二氧化碳之吸收效率。
本研究的目的是(1)探討崁入不同3D紊流促進器及排列形狀對於吸收效率的增益；(2)建立一維數學模型，提出一種預測雙件式平板型薄膜模組CO2吸收效率的回歸經驗式；(3)探討各種參數對CO2吸收通量和吸收率改善的影響。

關鍵字

CO2吸收 ； 3D紊流促進器 ； 雙件式平板型薄膜系統 ； 吸收通量 ； 吸收率

並列摘要

A Double-Unit Flat-Plate gas-liquid membrane contactor with inserting the 3D printed turbulent promoters was explored to effectively enhance the CO2 absorption by aqueous amine solutions (MEA). In this study, both the theoretical model and ex-perimental work were performed to predict and to optimize the CO2 absorption efficiency under concurrent- and countercur-rent-flow operations for various operating and channel design conditions. The effect of mass transfer coefficients on the ab-sorption efficiency, average Sherwood number, and CO2 concentration distribution, were explored with the absorbent MEA flow rate, CO2 gas feed flow rate and inlet CO2 concentration as parameters. The theoretical predictions of the CO2 absorption effi-ciency enhancement by inserting turbulence promoters was calculated and validated by experimental data. CO2 absorption effi-ciency enhancement was achieved in the channel with inserting the 3D printed turbulence promoters as compared to that of the device without inserting turbulence promoters (empty channel). The purposes of this study are (1) to study the effects of various operation parameters on the CO2 absorption efficiency improvement.; (2) to develop a one-dimensional mathematical model and propose a general numerical method for predicting the CO2 absorption efficiency in gas-liquid membrane contactor with in-serting the 3D printed turbulence promoter in the flow channel; (3) to develop a one-dimensional mathematical model and pro-pose a general numerical method for predicting the CO2 absorption efficiency in double-unit flat-plate membrane contactors.

並列關鍵字

CO2 absorption ； 3D printed turbulence promoter ； Double-unit flat-plate Membrane module ； Absorption flux ； Absorption efficiency

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