https://scholars.lib.ntu.edu.tw/handle/123456789/462855
標題: | Optimizing the energetic performance of capacitive deionization devices with unipolar and bipolar connections under constant current charging | 作者: | Chen, Y.-A. Fan, C.-S. Hou, C.-H. CHIA-HUNG HOU |
關鍵字: | Activated carbon; Bipolar connection; Capacitive deionization; Desalination; Energetic optimization | 公開日期: | 2018 | 卷: | 93 | 起(迄)頁: | 201-210 | 來源出版物: | Journal of the Taiwan Institute of Chemical Engineers | 摘要: | In this study, the desalination performance and energy efficiency of a scaled-up capacitive deionization (CDI) device, in which a one-unit cell was composed of a pair of 20 cm × 20 cm activated-carbon electrodes, was evaluated at constant voltage and constant current charging in a single-pass mode. Moreover, a three-cell CDI device was operated with unipolar and bipolar connections under constant current charging. The CDI performance was evaluated in terms of the desalination capacity (DC), mean deionization rate (MDR), charge efficiency, specific energy input (Esalt), specific energy efficiency (SEE), and optimization product. A comparison of the optimal operation points for the desalination of 0.01M NaCl revealed that the bipolar CDI had an MDR of 0.085 mg/g/min, which was 37% higher than that with the unipolar connection, and the SEE for a bipolar connection was 4.92 mg/g/kJ, which was 10% larger than that for a unipolar connection. These differences are due to the non-uniform voltage distribution among three-pair electrodes connected in series. Consequently, a bipolar CDI stack has a higher salt-removal rate and energy efficiency for desalination. These findings constitute significant contributions to the promotion of a more relevant CDI configuration for real water-desalination operating systems. © 2018 Taiwan Institute of Chemical Engineers |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/462855 | DOI: | 10.1016/j.jtice.2018.06.039 | SDG/關鍵字: | Activated carbon; Desalination; Electrodes; Sodium chloride; Water filtration; Activated carbon electrode; Bipolar connection; Capacitive deionization; Constant current charging; Optimal operation point; Specific energy input; Voltage distribution; Water desalination; Energy efficiency |
顯示於: | 環境工程學研究所 |
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