A cascade organic Rankine cycle power generation system using hybrid solar energy and liquefied natural gas

被引：85

作者：

Li, Pengcheng ^{[1
]}

Li, Jing ^{[1
]}

Pei, Gang ^{[1
]}

Munir, Anjum ^{[2
]}

Ji, Jie ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Jinzhai Rd 96, Hefei 230026, Anhui, Peoples R China

[2] Univ Agr Faisalabad Pakistan, Dept Energy Syst Engn, Faisalabad, Pakistan

来源：

SOLAR ENERGY | 2016年 / 127卷

基金：

美国国家科学基金会;

关键词：

Organic Rankine cycle; LNG; Solar energy; Equivalent efficiency; LNG COLD ENERGY; THERMODYNAMIC ANALYSIS; FLUID SELECTION; WORKING FLUIDS; HEAT SINK; RECOVERY; OPTIMIZATION; DRIVEN; ORC;

D O I：

10.1016/j.solener.2016.01.029

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

A cascade organic Rankine cycle (ORC) system utilizing solar energy and liquefied natural gas (LNG) for thermal power generation is proposed. Energy from solar collectors drives the evaporation of working fluid in the top cycle (I). The heat released by cycle I facilitates the evaporation of working fluid in the bottom cycle (II). LNG is the cold source of cycle II. The system is optimized with respect to a new index, i.e., the equivalent efficiency, which denotes the ratio of the extra electricity produced by adding collectors and the received solar irradiation. Its advantages are clarified in comparison with existing indices like thermal efficiency, cold energy efficiency, and exergetic efficiency. The effects of working fluids on the system performance are investigated. Flat plate collectors (FPC) and evacuated tube collectors (ETC) are exemplified. It is shown that the equivalent efficiency is the most suitable index to embody the effectiveness of combination of solar collectors and LNG. A maximum equivalent efficiency of 5.99% can be obtained on the use of isopentane/R125 and ETC. The volume ratio for each expander in the cascade ORC is much smaller than that in single-stage ORC, thereby resulting in easier design and manufacture of the expanders. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：136 / 146

页数：11

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