Shi Chufeng, Wang Hongyang, Li Ao, Zhu Guangcan, Zhao Xiaoli, Wu Fengchang
School of Energy and Environment, Southeast University, Nanjing 210096, China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Water Res. 2023 Feb 15;230:119517. doi: 10.1016/j.watres.2022.119517. Epub 2022 Dec 22.
Flow-electrode capacitive deionization (FCDI) is a new technology for ion removal that delivers sustainable deionization performance. However, FCDI consumes relatively high amounts of energy compared with other conventional desalination technologies, which hinders the industrial application of FCDI. In this study, the energy consumption of each FCDI component was simulated using a steady-state FCDI model to investigate and optimize the main components of energy consumption. Overall, the established process model can be used for theoretical investigation and enhancing our fundamental understanding of the energy consumption of each FCDI component, and provides the design and optimization of FCDI systems. The results showed that the energy consumption of the flow electrodes dominated under most conditions. Changing the operating parameters could obviously affect energy consumption and the energy consumption structure. However, increasing the flow rate and activated carbon (AC) content of the flow-electrode could decrease the energy consumption of the electrode, and the energy consumed by the ion-exchange membranes (IEMs) and desalination chamber was the greatest. These two parts of energy consumption could not be significantly reduced by changing operational parameters. Thus, to further reduce the energy consumption, optimization of the FCDI equipment was carried out by adding titanium mesh to the flow electrodes and the desalination chamber of the FCDI cell. The results showed that the energy consumption of optimized FCDI decreased by 51.9% compared with the original FCDI. The long-term experiment using optimized FCDI showed good stability and repeatability.
流动电极电容去离子化（FCDI）是一种用于离子去除的新技术，具有可持续的去离子化性能。然而，与其他传统脱盐技术相比，FCDI消耗的能量相对较高，这阻碍了FCDI的工业应用。在本研究中，使用稳态FCDI模型模拟了每个FCDI组件的能耗，以研究和优化能耗的主要组件。总体而言，所建立的过程模型可用于理论研究，增强我们对每个FCDI组件能耗的基本理解，并为FCDI系统的设计和优化提供依据。结果表明，在大多数情况下，流动电极的能耗占主导地位。改变操作参数会明显影响能耗和能耗结构。然而，增加流动电极的流速和活性炭（AC）含量可以降低电极的能耗，而离子交换膜（IEMs）和脱盐室消耗的能量最大。通过改变操作参数，这两部分能耗无法显著降低。因此，为了进一步降低能耗，通过在FCDI电池的流动电极和脱盐室中添加钛网对FCDI设备进行了优化。结果表明，优化后的FCDI能耗比原始FCDI降低了51.9%。使用优化后的FCDI进行的长期实验显示出良好的稳定性和可重复性。
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