首页|A mathematical model of the external circuits in a bipolar membrane electrodialysis stack: Leakage currents and Joule heating effect
A mathematical model of the external circuits in a bipolar membrane electrodialysis stack: Leakage currents and Joule heating effect
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NSTL
Leakage currents existing in a bipolar membrane electrodialysis (EDBM) stack caused loss of coulombic efficiency, ranged from approximately 0.9% to 12%, and created undesirable heat that impaired its operation. A mathematical model for electrical analog of a cell pair, predicting leakage currents and Joule heating effect of the external circuits in a EDBM stack was developed by considering the electrochemical process as an electrical analog circuit. Current and potential balance equations was used to define the equivalent network, and differential calculus was applied to solve these equations. Leakage current model was validated with experimental and simulated results. On this basis, leakage currents and Joule heating effect in a pilot-scale EDBM stack were analyzed. The results revealed that leakage currents in external circuits were distributed symmetrically around the membrane stack and were significantly affected by the number of cell pairs, current density, and element resistivity. Moreover, Joule heating effect in the external circuit in the stack was quantitatively analyzed and the temperature effect was dominated by the slot closed to the electrode cell in the acid compartment. This was most pronounced (raised by 12.18 °C in 0.3 s) during the termination stage. Using these findings, EDBM stacks can be improved and the optimal spacers and a more reasonable process can be designed, which could boost the development of EDBMs.
Bipolar Membrane ElectrodialysisProducing Acid and BaseLeakage CurrentsDifferential CalculusJoule Heating Effect
Yue Sun、Peixin Shi、Zheng Peng
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Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing 211189, China
NSTL
