DOI: 10.1016/j.watres.2018.06.034
Scopus记录号: 2-s2.0-85049319178
论文题名: Energy consumption in capacitive deionization – Constant current versus constant voltage operation
作者: Dykstra J.E. ; Porada S. ; van der Wal A. ; Biesheuvel P.M.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 143 起始页码: 367
结束页码: 375
语种: 英语
英文关键词: Capacitive deionization
; Constant current and constant voltage operation
; Minimizing energy consumption
; Optimizing salt adsorption
Scopus关键词: Desalination
; Energy utilization
; Molecular biology
; Recovery
; Capacitive deionization
; Charge and discharge
; Constant current and constant voltages
; Constant voltage
; Data representations
; Minimizing energy
; Objective functions
; Operational modes
; Energy efficiency
; adsorption
; degradation
; desalination
; energy efficiency
; energy use
; experimental study
; operations technology
; optimization
; recovery
; Article
; conceptual framework
; desalination
; electric potential
; energy consumption
; energy recovery
; methodology
; priority journal
; water supply
英文摘要: In the field of Capacitive Deionization (CDI), it has become a common notion that constant current (CC) operation consumes significantly less energy than constant voltage operation (CV). Arguments in support of this claim are that in CC operation the endpoint voltage is reached only at the end of the charging step, and thus the average cell voltage during charging is lower than the endpoint voltage, and that in CC operation we can recover part of the invested energy during discharge. Though these arguments are correct, in the present work based on experiments and theory, we conclude that in operation of a well-defined CDI cycle, this does not lead, for the case we analyze, to the general conclusion that CC operation is more energy efficient. Instead, we find that without energy recovery there is no difference in energy consumption between CC and CV operation. Including 50% energy recovery, we find that indeed CC is more energy efficient, but also in CV much energy can be recovered. Important in the analysis is to precisely define the desalination objective function, such as that per unit total operational time –including both the charge and discharge steps– a certain desalination quantity and water recovery must be achieved. Another point is that also in CV operation energy recovery is possible by discharge at a non-zero cell voltage. To aid the analysis we present a new method of data representation where energy consumption is plotted against desalination. In addition, we propose that one must analyze the full range of combinations of cycle times, voltages and currents, and only compare the best cycles, to be able to conclude which operational mode is optimal for a given desalination objective. We discuss three methods to make this analysis in a rigorous way, two experimental and one combining experiments and theory. We use the last method and present results of this analysis. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112591
Appears in Collections: 气候减缓与适应
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作者单位: Department of Environmental Technology, Wageningen University, Netherlands; Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, Netherlands; Soft matter, Fluidics and Interfaces Group, Faculty of Science and Technology, University of Twente, Enschede, Netherlands; Evides, Rotterdam, Netherlands
Recommended Citation:
Dykstra J.E.,Porada S.,van der Wal A.,et al. Energy consumption in capacitive deionization – Constant current versus constant voltage operation[J]. Water Research,2018-01-01,143