标题: Thermal effect of the stack in a bipolar membrane electrodialysis: Mechanism, risk, size effect and salt effect

作者: Peng, Z (Peng, Zheng); Cheng, YY (Cheng, Yanyan); Ma, XQ (Ma, Xueqing); Hu, XY (Hu, Xiaoyang); Han, Y (Han, Yi); Wang, HP (Wang, Hongping)

来源出版物: DESALINATION 卷: 586 文献号: 117838 DOI: 10.1016/j.desal.2024.117838 Published Date: 2024 OCT 1

摘要: Thermal effect inevitably occurred in a bipolar membrane electrodialysis (BMED) stack impacts its energy efficiency and potentially damages non-metallic components. Up to now, thermal mechanism and impacts within a BMED stack remain incompletely understood. Thus, thermal mechanism and impacts within the stack were investigated using the validated equivalent circuit model of a BMED system. Its results revealed that currents/ Joule effect in the main circuit were dominant compared to those in the external circuit. The proportion of Joule heat in the main circuit exceeds 99.00 %, while that in the external circuit was less than 1.00 %. Joule heat generated in the outermost slot of the maximum conductivity compartment was obvious, while that in any position of the main circuit within the minimum conductivity compartment was also significant. Thermal impacts of non-metallic components were affected by the heat transfer of solution thermal effect. Besides, these effects which included current distribution, Joule effect, and thermal risk, were mainly affected by the size of the element at spacer, and the conductance provided by the salt and its products. Larger size of slots/ducts at spacer reduced the heat transfer efficiency at their location, while that of main channel enhanced the heat transfer efficiency between membranes and solution. Low conductivity salts and corresponding products pose a greater thermal risk for BMED stack. Meanwhile, these effects would be aggravated from the lab- to large-scale BMED stack. These findings can enhance the comprehension of the involved processes for optimizing BMED technique, thereby accelerating its development.

作者关键词: Bipolar membrane electrodialysis; Currents distribution; Joule effect; Thermal risk; Size effect; Salt effect

KeyWords Plus: WATER; DESALINATION; PERFORMANCE; RESISTANCE; REDUCTION; CURRENTS

地址: [Peng, Zheng; Ma, Xueqing; Hu, Xiaoyang; Wang, Hongping] Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

[Peng, Zheng; Cheng, Yanyan] Southeast Univ, Sch Civil Engn, Dept Municipal Engn, Nanjing 211189, Peoples R China.

[Cheng, Yanyan] State Grid Jiangsu Elect Power Design Consulting C, Xuzhou Survey & Design Branch, Xuzhou 221005, Peoples R China.

[Han, Yi] Anqing Normal Univ, Sch Resources & Environm, Dept Environm Sci & Engn, Anqing 246011, Peoples R China.

[Wang, Hongping] Wuhan Univ, Res Inst Water Secur, Wuhan 430072, Peoples R China.

通讯作者地址: Wang, HP (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Sci & Engn, Wuhan 430079, Peoples R China.

Han, Y (通讯作者)，Anqing Normal Univ, Sch Resources & Environm, Dept Environm Sci & Engn, Anqing 246011, Peoples R China.

电子邮件地址: yihan@whu.edu.cn; hongping.wang@whu.edu.cn

影响因子：8.3