不同单价电解质水溶液对逆电渗析电堆工作特性的影响  

Influences of different monovalent electrolyte aqueous solution on the performance characteristics of reverse electrodialysis stack

作　　者：吴德兵[1] 徐士鸣[1] 吴曦[1] 胡军勇[1] 冷强 徐志杰 金东旭[1] 王平[1] WU Debing;XU Shiming;WU Xi;HU Junyong;LENG Qiang;XU Zhijie;JIN Dongxu;WANG Ping(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学能源与动力学院

出　　处：《化工进展》2019年第6期2738-2745,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(51776029,51606024)

摘　　要：以5种工质盐溶液作为逆电渗析堆(RED)的工作溶液,分别在两种浓度(mol/L)比(3/0.05、5/0.05)下,分析逆电渗析堆主要工作特性参数:开路电压、电堆欧姆内阻以及功率密度。实验结果表明:电导率高的电解质溶液为工质时,电堆内阻降低,实验中以浓度比5/0.05溴化铵溶液为工质的电堆具有最低的欧姆内阻(2.80Ω),同时电堆开路电压也最低(1.355V)。因为过高的溶液浓度梯度降低了离子交换膜的离子选择透过性。浓度比5/0.05乙酸钾溶液为工质的电堆具有高的开路电压,达到1.929V,比氯化锂溶液高6.9%,但其电堆内阻比氯化锂溶液高17%,以氯化锂溶液为工质的电堆输出的最大功率密度达到2.217W/m^2。以乙酸钠溶液为工质开路电压比乙酸钾稍低,但其内阻过高,使得输出的最大功率密度最小。The present work experimentally investigates the use of five pure salt solutions as working solution in a lab-scale reverse electrodialysis(RED) stack. The main performance parameters of RED stack were analyzed in terms of open circuit voltage(OCV), stack ohm-resistance and power density.Effect of two concentration gradients(3/0.05 and 5/0.05) was investigated. Results show that the electrolyte solution with high electric conductivity is good to reduce stack ohm-resistance. The experimental lowest stack resistance of 2.8Ω was measured when using NH4Br solution at concentration of5/0.05, meanwhile, the experimental lowest OCV reached at 1.355 V. Because the permselectivity of ionexchange membranes is weakened at high concentration. The experimental highest OCV of 1.929 V was measured when using KAc solution at concentration of 5/0.05, which is about 9% higher than the OCV in LiCl at the same concentration. Due to 17% lower resistance, the latter achieved the maximum power density of 2.217 W/m^2. The OCV in NaAc is slightly lower than that in KAc, but the latter internal resistance is too high, which makes the latter maximum power density minimum.

关 键 词：逆电渗析 电解质 电化学 盐差能 传质 

分 类 号：TK115[动力工程及工程热物理—热能工程]