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Multi-stage reverse electrodialysis: Strategies to harvest salinity gradient energy

机译：多级反向电渗析：盐度梯度能量收集策略

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摘要

Reverse electrodialysis heat engine (REDHE) is an effective technology to harvest salinity gradient energy (SGE) driven by low grade heat. In order to improve the energy conversion efficiency of it, one practical way is to enhance the capturing SGE ability of the reverse electrodialysis (RED) unit. To achieve that, the promising multistage RED (MSRED) method is proposed. In this paper, two strategies for MSRED, i.e., individually control (Strategy I) and serial control (Strategy II) respectively, were theoretically compared and analyzed. The results showed that Strategy II is more suitable in practice, although its performance is slightly inferior compared with Strategy I. After that, the influence of feed solution velocity, thickness of high concentration solution compartments, concentrations of feed solutions and flow arrangement on the relevant key performance indicators of MSRED in the two strategies were investigated. And results demonstrated that thickening compartments of high concentration solution, increasing the concentration of high concentration feed solution and adopting counter-flow arrangement are all more effective for elevating the performance of MSRED than increasing feed solution velocity. Furthermore, increasing the concentration of low concentration feed solution overly has a significant negative impact on the performance of MSRED.
机译：反向电渗析热机（REDHE）是一种有效的技术，可以收集由低级热量驱动的盐度梯度能量（SGE）。为了提高其能量转换效率，一种实用的方法是增强逆电渗析（RED）单元的捕获SGE能力。为此，提出了一种有前途的多级RED（MSRED）方法。本文从理论上比较和分析了MSRED的两种策略，即分别控制（策略I）和串行控制（策略II）。结果表明，策略II尽管在性能上比策略I稍差，但在实践中更为合适。之后，进料溶液速度，高浓度溶液室的厚度，进料溶液的浓度和流量安排对相关策略的影响研究了两种策略中MSRED的关键性能指标。结果表明，与提高进料速度相比，高浓度溶液的增厚室，增加高浓度进料溶液的浓度以及采用逆流布置都比提高进料速度更有效。此外，过高增加低浓度进料溶液的浓度会对MSRED的性能产生重大负面影响。

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  • 来源
    《Energy Conversion & Management》 |2019年第3期|803-815|共13页
  • 作者

    Hu Junyong; Xu Shiming; Wu Xi; Wu Debing; Jin Dongxu; Wang Ping; Leng Qiang;

  • 作者单位

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

    Dalian Univ Technol, Sch Energy & Power, Minist Educ, Key Lab Ocean Energy Utilizat & Energy Conservat, Dalian 116024, Liaoning, Peoples R China;

  • 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 eng
  • 中图分类
  • 关键词

    Multi-stage reverse electrodialysis; Salinity gradient energy; Strategies; Power generation; Heat engine;

    机译：多级逆电渗析;盐度梯度能;策略;发电;热力发动机;

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