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Reverse electrodialysis heat engine with multi-effect distillation: Exergy analysis and perspectives

机译：具有多效蒸馏的反向电渗析热发动机：出现的分析和观点

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摘要

The increasing worldwide energy demand is rising the interest on alternative power production technologies based on renewable and emission-free energy sources. In this regard, the closed-loop reverse electrodialysis heat engine is a promising technology with the potential to convert low-grade heat into electric power. The reverse electrodialysis technology has been under investigation in the last years to explore the real potentials for energy generation from natural and artificial solutions, and recent works have been addressing also the potential of its coupling with regeneration strategies, looking at medium and large energy supply purposes. In this work, for the first time, a comprehensive exergy analysis at component level is applied to a reverse electrodialysis heat engine with multi-effect distillation in order to determine the real capability of the waste heat to power conversion, identifying and quantifying the sources of exergy destruction. In particular, sensitivity analyses have been performed to assess the influence of the main operating conditions (i.e. solutions concentration and velocity) and design features (aspect ratio of the pile), characterizing the most advantageous scenarios and including the effect of new generations of membranes. Results show that the multi-effect distillation unit is the main source of exergy destruction. Also, using high-performing membranes, inlet solutions concentration and velocity of 4.5-0.01 mol/L and 0.2-0.36 cm/s, respectively, a global exergy efficiency of 24% is reached for the system, proving the high potential of this technology to sustainably convert waste heat into power.
机译：全球能源需求的增加正在基于可再生和无排放能源对替代电力生产技术的兴趣升高。在这方面，闭环反向电渗土热发动机是一种有希望的技术，其可能将低级热量转换为电力。在过去几年中，反向电渗析技术已经在探讨了自然和人工解决方案的能源产生的实际潜力，最近的作品也在解决与再生策略的耦合，看着中等和大量的能量供应目的。 。在这项工作中，首次在组件水平上进行全面的电渗液分析，以多效蒸馏应用于反向电渗析热发动机，以便确定废热能力转换的真实能力，识别和量化来源漏洞破坏。特别地，已经进行了敏感性分析以评估主要操作条件（即溶液浓度和速度）和设计特征（桩的纵横比）的影响，其特征是最有利的场景，包括新一代膜的效果。结果表明，多效蒸馏单位是漏洞破坏的主要来源。此外，使用高性能膜，入口溶液浓度和速度为4.5-0.01mol / L和0.2-0.36cm / s，为系统达到全球漏洞24％，证明了这项技术的高潜力可持续地将浪费的浪费转化为能力。

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