Simulation and experimental study on carbon dioxide absorption using hollow fiber membrane contactor
| Autor: | Zong-Shian Yang, 楊宗賢 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 The carbon dioxide capture processes using tubular membrane contactor with physical and chemical absorption was investigated experimentally and theoretically in the study. First, simulation results were compared with experimental data to confirm the feasibility of the simulation program. Then the carbon dioxide concentration profiles in the tubular module, the distribution of carbon dioxide flux and the recovery were simulated to study the effect of gas flow rate, liquid flow rate, mixed amines solution and tubular length etc. on the absorption performance. A commercial PVDF hollow fiber membrane contactor was used for carbon dioxide capture experiments. Distilled water and amines absorbent 2-Amino-2-Methyl-1-Propanol (AMP) with different concentrations of Piperazine (PZ) as the activator were used for preparing absorbing solution. Experimental results from physical absorption showed that the absorption flux of carbon dioxide increase with liquid volumetric flow rate, but the gas flow rates only give a slight effect on the absorption rate. When carbon dioxide was captured by chemical absorption, the absorption rate is enhanced significantly and the effect of gas volumetric flow rate on absorption flux is more significant impact than that by liquid flow rate. Removal fraction of carbon dioxide decreases with the increase of gas flow rate, while the liquid flow rate only gives a slight effect. Simulation results in chemical absorption showed that the carbon dioxide was almost completely reacted in the region very close to liquid- membrane surface. The gas flow rate and membrane length are playing important roles in the carbon dioxide concentration profile in the axial direction of gas phase. It can be concluded that the simulation process can be used for determining the better module length and operating conditions for carbon dioxide capture. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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