Influence of current density and concentration difference between solutions on mass transfer in reverse electro-dialysis stack

doi:10.11949/j.issn.0438-1157.20180449

Abstract

Abstract:

Taking the NaCl aqueous solution as the working fluid, the mass transfer characteristic of which in a reverse electro-dialysis (RED) stack have been tested under the conditions of changing the current density and concentration difference between solutions through the RED stack. The RED stack used in the experiments was composed of 5 unit membrane cells with Selemion type of ion exchange membranes (IEMs). The results showed that the selectivity coefficient (a), solvent permeability ratio (v_w), solute ion transport flux (J_NaCl) and co-ion diffusion rate (D_NaCl) of IEMs were affected by stack current density and solution concentration. When the concentration difference increases, the a reduces, but the v_w, J_NaCl and D_NaCl increase. With the increase of the electric current density exported by the RED stack, the α and v_w reduce, but the J_NaCl and D_NaCl increase.

Key words: membrane, reverse electrodialysis, mass transfer, solution, current, concentration difference

摘要：

以氯化钠溶液作为工质情况下，通过改变逆电渗析电堆输出电流和溶液浓差，对由5对Selemion型离子交换膜（IEMs）单元电池所构成的实验用RED电堆进行堆内质量传递规律的实验研究。研究结果发现，IEMs选择性系数（a）、溶剂透膜渗透速率（v_w）、溶质透膜迁移通量（J_NaCl）和同价离子透膜扩散率（D_NaCl）均受电堆电流密度和溶液浓差的影响。当溶液浓差增大时，a降低，而v_w、J_NaCl和D_NaCl均增大；当电流密度增大时，a和v_w降低，J_NaCl和D_NaCl增大。

关键词: 膜, 逆电渗析, 传质, 溶液, 电流, 浓差

CLC Number:

TQ152

XU Shiming, ZHANG Kai, WU Xi, WU Debing, HU Junyong, HE Qichen, JIN Dongxu, WANG Ping. Influence of current density and concentration difference between solutions on mass transfer in reverse electro-dialysis stack[J]. CIESC Journal, 2018, 69(10): 4206-4215.

徐士鸣, 张凯, 吴曦, 吴德兵, 胡军勇, 何其琛, 金东旭, 王平. 电流与浓差对逆电渗析电堆内质量传递的影响[J]. 化工学报, 2018, 69(10): 4206-4215.

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