Performance improvement of LiBr-H_2O reverse electrodialysis unit for heat to power conversion with finite solution flowrate and large concentration change

Zijian Liu; Ding Lu; Yuming DongYin BaiTao ShenHui ChenMaoqiong Gong

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Performance improvement of LiBr-H_2O reverse electrodialysis unit for heat to power conversion with finite solution flowrate and large concentration change

机译：Performance improvement of LiBr-H_2O reverse electrodialysis unit for heat to power conversion with finite solution flowrate and large concentration change

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摘要

The reverse electrodialysis heat engine is an emerging technology that converts low-grade heat into electric power. However, the conventional reverse electrodialysis unit, developed based on the "infinite" flowrate assumption, fails to effectively utilize salinity gradient power produced by the regeneration unit that operates under a certain concentration gradient. In this study, a novel LiBr-H_2O reverse electrodialysis unit based on the "finite" flowrate assumption is investigated to match the regeneration unit better. The resistance-distributed mathematical model is built and experimentally validated, considering that the resistance along the flow channel shows more significant variation under the condition of finite flowrate and large concentration change. Results show that the finite flowrate assumption is more suitable for the reverse electrodialysis heat engine application, and the utilization rate of Gibbs free energy can reach 99.8 %, indicating that the novel reverse electrodialysis unit is well-matched with the regeneration unit. The valuable salinity gradient power is nearly completely recovered. As a result, the maximum overall efficiency of the novel reverse electrodialysis unit is 28.6 %, which is superior to that of the reverse electrodialysis unit with a recirculating arrangement and comparable with the reverse electrodialysis unit with serious membrane stacks. Moreover, the technical economy and the exergy efficiency of the novel reverse electrodialysis unit are better than the rest. This work proves the capacity of a LiBr-H_2O reverse electrodialysis unit based on a "finite" flowrate assumption as a more adaptable arrangement for the REDHE applied for efficient capture of the widespread low-grade energy.

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来源
《Energy conversion & management》 |2022年第10期|116263.1-116263.9|共9页
作者
Zijian Liu; Ding Lu; Yuming DongYin BaiTao ShenHui ChenMaoqiong Gong;
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作者单位

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China, University of Chinese Academy of Sciences, Beijing 100049, China;

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China, University of Chinese Academy of Sciences, Beijing 100049, China, Institute of Optical Physics and Engineering Technology, Qilu;

College of Energy and Machinery, Dezhou University, Dezhou 253023, ChinaInstitute of Optical Physics and Engineering Technology, Qilu Zhongke, Jinan 251000, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Reverse electrodialysis; Heat engine; Lithium bromide; Finite flowrate; Large concentration change;

Performance improvement of LiBr-H_2O reverse electrodialysis unit for heat to power conversion with finite solution flowrate and large concentration change

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