中低温热能驱动的非共沸工质有机Rankine循环

李健; 杨震; 段远源

doi:10.16511/j.cnki.qhdxxb.2022.25.011

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清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (4) : 693-703. DOI: 10.16511/j.cnki.qhdxxb.2022.25.011

综述

中低温热能驱动的非共沸工质有机Rankine循环

李健, 杨震, 段远源

作者信息 +

Organic Rankine cycles using zeotropic mixtures driven by low-to-medium temperature thermal energy

LI Jian, YANG Zhen, DUAN Yuanyuan

Author information +

文章历史 +

摘要

有机Rankine循环(organic Rankine cycle,ORC)是目前实现200℃以下中低温热能高效热功转换的主流技术之一。非共沸工质可有效减少换热损,实现组元性能的优势互补,扩大工质遴选范围,正在成为ORC领域研究应用的新趋势。该文总结了作者团队在非共沸ORC系统优化设计、性能分析等方面的研究进展,并在常规非共沸工质ORC的基础上引入了双压蒸发循环以改善蒸发过程的温度匹配,显著减少换热损;引入分液冷凝方法提升了非共沸工质的冷凝换热性能,大幅降低系统成本。总体而言,非共沸工质可显著提升ORC系统的热力性能,分液冷凝方法又可有效解决其所需换热面积大、热经济性能差的缺陷;因此,非共沸工质在ORC系统中具有广阔的应用前景。

Abstract

The organic Rankine cycle (ORC) is a mainstream technology for efficient heat-power conversion of low-to-medium temperature thermal energy below 200℃. Zeotropic mixtures effectively reduce the heat transfer exergy losses, complement the advantages of pure components, and extend the working fluid useful temperature range. Thus, zeotropic mixtures are being rapidly accepted into the ORC field. This paper summarizes the research progress by the authors' team in optimizing the design of ORC systems using zeotropic mixtures. Conventional ORC systems using zeotropic mixtures have been expanded by the introduction of dual-pressure evaporation cycles to improve the temperature matching during evaporation and significantly reduce the heat transfer losses. The liquid-separation condensation method is also used to increase the condensation heat transfer rate of the zeotropic mixtures which greatly reduces the system cost. In summary, zeotropic mixtures can significantly improve the thermodynamics of ORC systems while the liquid-separation condensation method can effectively reduce the large heat transfer areas and improve the poor thermo-economic performance of systems using zeotropic mixtures. Thus, zeotropic mixtures then have favorable prospects for use in ORC systems.

导出引用

李健, 杨震, 段远源. 中低温热能驱动的非共沸工质有机Rankine循环[J]. 清华大学学报（自然科学版）. 2022, 62(4): 693-703 https://doi.org/10.16511/j.cnki.qhdxxb.2022.25.011

LI Jian, YANG Zhen, DUAN Yuanyuan. Organic Rankine cycles using zeotropic mixtures driven by low-to-medium temperature thermal energy[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(4): 693-703 https://doi.org/10.16511/j.cnki.qhdxxb.2022.25.011

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段远源,教授,E-mail:yyduan@tsinghua.edu.cn

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收稿日期	出版日期
2021-09-24	2022-04-15
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