基于分液冷凝的R245fa/pentane混合工质朗肯循环多目标优化

doi:10.11949/j.issn.0438-1157.20171182

化工学报 ›› 2018, Vol. 69 ›› Issue (5): 2040-2048.DOI: 10.11949/j.issn.0438-1157.20171182

基于分液冷凝的R245fa/pentane混合工质朗肯循环多目标优化

黄仁龙, 罗向龙, 梁志辉, 陈颖

广东工业大学材料与能源学院, 广东广州 510006

收稿日期:2017-08-28 修回日期:2017-11-07 出版日期:2018-05-05 发布日期:2018-05-05
通讯作者: 罗向龙
基金资助:
国家自然科学基金面上项目（51476037）；广东省重大科技专项资金项目（2013A011402006）；广东省应用型科技研发专项资金项目（2016B020243010）。

Multi-objective optimization of Rankine cycle using R245fa/pentane based on liquid-vapor separation

HUANG Renlong, LUO Xianglong, LIANG Zhihui, CHEN Ying

Institute of Materials and Energy, Guangdong University of Technology, Gunagzhou 510006, Guangdong, China

Received:2017-08-28 Revised:2017-11-07 Online:2018-05-05 Published:2018-05-05
Supported by:
supported by the National Natural Science Foundation of China (51476037), the Science and Technology Major Project of Guangdong (2013A011402006) and Guangdong Special Funding for Applied Technology Research & Development (2016B020243010).

摘要/Abstract

摘要：

有机朗肯循环（ORC）是一种利用低温余热进行发电的热电转换技术。由于热源温位低，导致其效率不高，设备投资成本高。因此，本文从降低系统成本和提高其热力性能角度出发，把分液冷凝技术运用于双压蒸发的非共沸ORC系统，利用NSGA-Ⅱ多目标算法对基本ORC（BORC），气液分离-双级蒸发ORC（DSORC），串联双级蒸发ORC（STORC）和分液冷凝-双级蒸发ORC（TLORC）四种系统的净输出功和比成本（SIC）进行优化对比。优化结果表明：在BORC系统中，多维偏好线性规划法（LINMAP）优化得出的点表明非共沸工质的净输出功分别要比纯R245fa和纯pentane高5.6%和14.0%。在DSORC系统中，LINMAP点表明非共沸工质的净输出功要比R245fa和pentane分别高1.2%和6.3%；在所研究的四种系统中，Pareto Front表明TLORC系统SIC最低，比BORC系统低5.4%，同时净输出功比BORC系统高4.86%。

关键词: 热力学, 算法, 优化, 有机朗肯循环, 非共沸工质, 分液冷凝, 双级蒸发

Abstract:

Organic Rankine cycle (ORC) is considered as a promising heat-to-power technology for low grade heat recovery. The thermal efficiency of ORC is low and investment cost of equipment is high as temperature of heat sources is low. Low thermal efficiency results in high investment cost of equipment. This work focuses on cutting costs and increasing power generation of ORC and proposes a liquid-separation condensation and two-stage evaporation zeotropic ORC system. Multi-objective optimization using NSGA-Ⅱ is conducted for the BORC, DSORC, STORC and TLORC using zeotropic (R245fa/pentane) or pure fluids (R245fa and pentane). The optimization results indicate that:the net power output of BZORC is 5.6% and 14.0% higher than that of R245fa and pentane when using LINMAP method optimization; LINMAP point shows that the net power output of DSORC is 1.2% and 6.3% higher than that of R245fa and pentane, respectively; Among these four cycle configurations, Pareto Front shows the SIC in TLORC using R245fa/pentane is the lowest, about lower by 5.4% than BORC, while the net power output is 4.86% higher than BZORC.

Key words: thermodynamics, algorithm, optimization, organic Rankine cycle, zeotropic mixture, liquid-separation condensation, dual-pressure evaporation

中图分类号:

TK284.1

黄仁龙, 罗向龙, 梁志辉, 陈颖. 基于分液冷凝的R245fa/pentane混合工质朗肯循环多目标优化[J]. 化工学报, 2018, 69(5): 2040-2048.

HUANG Renlong, LUO Xianglong, LIANG Zhihui, CHEN Ying. Multi-objective optimization of Rankine cycle using R245fa/pentane based on liquid-vapor separation[J]. CIESC Journal, 2018, 69(5): 2040-2048.

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基于分液冷凝的R245fa/pentane混合工质朗肯循环多目标优化

Multi-objective optimization of Rankine cycle using R245fa/pentane based on liquid-vapor separation

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