Power generation by coupling reverse electrodialysis and ammonium bicarbonate: Implication for recovery of waste heat
Power generation by coupling reverse electrodialysis and ammonium bicarbonate: Implication for recovery of waste heat
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DOI：
10.1016/j.elecom.2012.03.004
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发表时间：
2012-06-01
影响因子：
5.4
通讯作者：
Huang, Xia
中科院分区：
文献类型：
--
作者：
Luo, Xi;Cao, Xiaoxin;Huang, Xia
由于能源危机和环境问题，余热的利用日益受到人们的重视。传统热力循环的余热转换效率受到热源温度的限制。本文提出了一种新型废热转化系统的概念，即热驱动电化学发生器(TDEG)，它由一个反向电渗析(RED)堆和一个精馏塔组成。通过使用热不稳定的碳酸氢铵溶液作为工质，废热可以转化为电能。首次在红电堆中验证了碳酸氢铵用于TDEG发电的可行性。对影响红堆输出功率的两个重要操作条件，即低浓度溶液浓度和进料液流量进行了优化，分别为0.02M和800mL/min。对于特定的红色电堆，获得了0.33W/m(2)的最大功率密度。在最佳条件下，离子通量效率和能量效率分别为88%和31%。这项研究为建立有前景的TDEG奠定了基础。(C)2012爱思唯尔B.V.保留所有权利。
Utilization of waste heat has attracted increasing attentions due to energy crisis and environmental problems. Efficiency of traditional thermodynamic cycles for waste heat conversion is limited by the temperature of heat sources. We propose here the concept of a novel waste heat conversion system, namely a thermal-driven electrochemical generator (TDEG), which comprises a reverse electrodialysis (RED) stack and a distillation column. By using thermally instable ammonium bicarbonate solutions as working fluids, waste heat can be converted to electricity. The feasibility of NH4HCO3 to generate electricity for TDEG was validated in a RED stack for the first time. Two important operating conditions influencing power output of RED stack, i.e. concentration of low concentration solution and flow rate of feed solutions were optimized to be 0.02 M and 800 mL/min, respectively. A maximum power density of 0.33 W/m(2) was obtained for the specific RED stack. Ionic flux efficiency and energy efficiency under the optimal condition were 88% and 31%, respectively. The study lays a foundation for the establishment of the promising TDEG. (C) 2012 Elsevier B.V. All rights reserved.