A study of working fluids for Organic Rankine Cycles (ORCs) operating across and below ambient temperature to utilize Liquefied Natural Gas (LNG) cold energy

被引：99

作者：

Yu, Haoshui ^{[1
]}

Kim, Donghoi ^{[1
]}

Gundersen, Truls ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, Kolbjoern Hejes V 1A, NO-7491 Trondheim, Norway

来源：

ENERGY | 2019年 / 167卷

关键词：

LNG cold energy; Organic Rankine cycle; Working fluid selection; Below ambient temperature; Low-temperature waste heat; ZEOTROPIC MIXTURES; WASTE HEAT; OPTIMIZATION; POWER; SELECTION; REPLACEMENT; RECOVERY; SYSTEM;

D O I：

10.1016/j.energy.2018.11.021

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Liquefied Natural Gas (LNG) contains significant amounts of cold exergy, which is normally wasted during regasification at receiving terminals. This paper addresses working fluid screening for Organic Rankine Cycles (ORCs) utilizing LNG cold energy. Due to the cryogenic temperature of LNG, the condensation temperature of an ORC should be far below ambient temperature, and the working fluid should be totally different from conventional ORCs operating above ambient temperature. However, the working fluids also depend on the cycle configuration and the natural gas target pressure. In this study, a simulation-based optimization framework is proposed to compare the performance of 22 candidate working fluids. The Particle Swarm Optimization (PSO) algorithm is adopted to optimize 5 and 7 dimensional search spaces for the combined systems operated across and below ambient temperature. Promising working fluids for ORCs considering the effect of natural gas target pressure are suggested based on the optimization results. The most energy efficient working fluids are R125, R143a, 8290 and R1270 for ORCs operated below ambient temperature without waste heat utilization. For ORCs operated across ambient temperature utilizing flue gas waste heat from a natural gas fired power plant, R170, R134a and R290 perform better than other working fluids. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：730 / 739

页数：10

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