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標題: | 旋轉填充床中氫氧化鈉甲醇溶液吸收二氧化碳 Carbon Dioxide Absorption by Sodium Hydroxide Methanol Solution in a Rotating Packed Bed |
作者: | Yuk-Man Tang 鄧煜文 |
指導教授: | 劉懷勝(Hwai-Shen Liu) |
關鍵字: | 旋轉填充床,化學吸收,吸收百分比,氣膜質傳係數,二氧化碳,甲醇, rotating packed bed,chemical absorption,gas-side mass transfer coefficient,absorption percentage,carbon dioxide,methanol, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 本研究於旋轉填充床中,以氫氧化鈉與甲醇為吸收劑,進行氫氧化鈉水溶液、氫氧化鈉甲醇水溶液以及氫氧化鈉甲醇溶液化學吸收二氧化碳,以研究在化學吸收之吸收劑中添加非水溶劑的效果;文中探討氣液流量、氫氧化鈉濃度、甲醇濃度等變數對吸收百分比、表徵總括氣膜質傳係數(KGa)、吸收劑之二氧化碳負載量(loadingCO2/NaOH、loadingCO2/MeOH)之影響。
實驗結果顯示CO2吸收百分比隨轉速、液體流量以及氫氧化鈉濃度增加而上升,但隨氣體流量增加而下降;KGa隨液體流量、氣體流量、轉速以及氫氧化鈉濃度增加而上升;loadingCO2/NaOH隨轉速以及氣體流量增加而上升,但隨液體流量以及氫氧化鈉濃度增加而下降;loadingCO2/MeOH則是隨著轉速、氣體流量以及氫氧化鈉濃度增加而提升,但隨著提高液體流量以及甲醇濃度而下降;此外,本實驗之CO2吸收百分比、KGa以及loadingCO2/NaOH皆隨甲醇濃度的增加而提升,其中又以溶劑為純甲醇時效果最佳,且其吸收百分比與水溶液相比,最高差距為65%,顯示以氫氧化鈉和甲醇為吸收劑有利於二氧化碳的吸收。 本研究實驗結果以及文獻資料提出一結合化學吸收與物理氣提/吸收之經驗迴歸式如下: (K_G a)/(D_G a_t^2 )=0.6∙Re_G^0.45 Re_L^0.50 Gr_G^0.20 H_y^(-0.5) We_L^0.20 (1+〖Ha〗)^0.3 The CO2 absorption by sodium hydroxide solutions, using water, methanol and methanol/water mixture as solvents in a rotating packed bed (RPB) were studied in this work. The gas and liquid flow rate, rotating speed, the concentration of sodium hydroxide and the weight percent of methanol were taken into consideration as operating variables to study the influence on absorption percentage, apparent overall volumetric mass transfer coefficient (KGa), loadingCO2/NaOH and loadingCO2/MeOH. According to experiment results, as liquid flow rate, the rotating speed and the concentration of sodium hydroxide increased, absorption percentage increased. However, absorption percentage decreased as gas flow rate increased. The KGa values increased with gas and liquid flow rate, the rotating speed and the concentration of sodium hydroxide. The loadingCO2/NaOH values increased with gas flow rate and the rotating speed, but loadingCO2/NaOH values decreased as the concentration of sodium hydroxide and liquid flow rate increased. The loadingCO2/MeOH increased as gas flow rate, the rotating speed and the concentration of sodium hydroxide increased. However, loadingCO2/MeOH decreased as the weight percent of methanol increased. Moreover, using pure methanol as solvent could promote CO2 absorption efficiency and raised absorption percentage at least 65% higer than using water as solvent. In this study, the KGa values of chemical absorption and physical stripping/absorption collected in this research can be predicted well with a correlation presented as: (K_G a)/(D_G a_t^2 )=0.6∙Re_G^0.45 Re_L^0.50 Gr_G^0.20 H_y^(-0.5) We_L^0.20 (1+〖Ha〗)^0.3 |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77613 |
DOI: | 10.6342/NTU201801861 |
全文授權: | 未授權 |
顯示於系所單位: | 化學工程學系 |
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