耦合液化天然气的液化空气储能系统热力学分析

doi:10.19799/j.cnki.2095-4239.2021.0184

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (5): 1589-1596.doi: 10.19799/j.cnki.2095-4239.2021.0184

• 物理储能十年专刊·压缩空气 • 上一篇下一篇

耦合液化天然气的液化空气储能系统热力学分析

何子睿¹(), 齐伟¹, 宋锦涛², 崔双双², 李红²()

^1.鲁能集团有限公司，北京 100020
^2.华北电力大学能源动力与机械工程学院，北京 102206

收稿日期:2021-04-27 修回日期:2021-05-20 出版日期:2021-09-05 发布日期:2021-09-08
作者简介:何子睿（1990—），男，工程师，主要从事绿色能源与建筑节能研究，E-mail：hezr@cgdg.com|李红，副教授，研究方向为热能工程，E-mail：bjlh@ncepu.edu.cn。
基金资助:
鲁能集团科技项目(SGLN0000KXJS2000114);国家重点研发计划项目(2017YFB0903601)

The thermodynamic analysis of a liquefied air energy storage system coupled with liquefied natural gas

Zirui HE¹(), Wei QI¹, Jintao SONG², Shuangshuang CUI², Hong LI²()

^1.Luneng Group, Beijing 100020, China
^2.School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2021-04-27 Revised:2021-05-20 Online:2021-09-05 Published:2021-09-08

摘要/Abstract

摘要：

为了提高液化空气储能(liquefied air energy storage，LAES)系统循环效率及?效率，对LAES系统的液化单元进行改进，提出了一种液化天然气耦合液化空气储能系统，建立了传统LAES系统和耦合系统的热力学模型，从导热油利用、系统?效率及循环效率等方面研究了耦合系统对与传统系统的改进。结果表明：耦合液化天然气的压缩空气储能系统，高温导热油利用率可达92.47%，导热油热量利用率最高提升11.18%，耦合系统?效率最高达66.68%，相比传统LAES，最高可提升15.67%，系统循环效率可达67.60%，最高可提升17.30%。耦合系统有效地改善了LAES系统导热油利用不完全的缺陷，提升了系统的循化效率，为大规模推进储能发展提供一种行之有效的系统方案。

关键词: 液化空气储能, 液化天然气, ?效率, 循环效率

Abstract:

The study improved the cycle efficiency and exergy efficiency of a liquefied air energy storage (LAES) system by improving the system's liquefaction unit. The paper established the thermodynamic model of a traditional LAES and its coupling system and studied the improvement of the coupling and traditional systems from the perspectives of heat-transfer oil utilization, system exergy efficiency, and cycle efficiency. The results showed that for the compressed air energy storage system coupled with liquefied natural gas, the use rate of high-temperature heat-transfer oil reached 92.47%. The heat utilization rate of heat-transfer oil could increase by 11.18%. The maximum exergy efficiency of the coupled system reached 66.68%, which was 15.67% higher than for a traditional LAES. The cycle efficiency of the system reached 67.60%, and the highest increase was 17.30%. The coupling system effectively improved the defects linked to incomplete utilization of the heat-transfer oil in a LAES system, improved the system's recycling efficiency, and provided an effective system solution for large-scale energy storage.

Key words: liquefied air energy storage, liquefied natural gas, exergy efficiency, cycle efficiency

中图分类号:

TQ 028.8

何子睿, 齐伟, 宋锦涛, 崔双双, 李红. 耦合液化天然气的液化空气储能系统热力学分析[J]. 储能科学与技术, 2021, 10(5): 1589-1596.

Zirui HE, Wei QI, Jintao SONG, Shuangshuang CUI, Hong LI. The thermodynamic analysis of a liquefied air energy storage system coupled with liquefied natural gas[J]. Energy Storage Science and Technology, 2021, 10(5): 1589-1596.

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项目名称	特点
卡灵顿工厂	一种低温储电厂，功率50 MW，致力于提供清洁，可靠且经济高效的长期能源存储和电网服务。
佛蒙特工厂	一个长期的液态空气能源存储设施，功率50 MW，容量400 MW·h，旨在稳定电网并确保未来的能源安全。
皮尔斯沃思电网规模示范厂	一种低温能量存储工厂，不仅能够储存能量，还能够将垃圾填埋气发动机的低级废热转化为动力。

单元	名称	参数
压缩机组	级数)	4
	第1级入口空气的温度/K	293.15
	第1级入口空气的压力/MPa	0.1
	空气流量/(kg·s^-1)	8
	绝热效率/%	85
膨胀机组	级数	4
膨胀机组	绝热效率/%	85
冷却器	入口温度/K	293.15
	压降/MPa	0
	换热端差/K	5
再热器	压降/MPa	0
再热器	换热端差/K	5

单元	序号	名称	参数
蓄冷回热器	1	温度/K	298.15
	2		84.05
	4		79.05
	7		293.15
	8		293.15
液态泵	－	绝热效率/%	85
节流阀	11	节流压力/MPa	0.1

单元	序号	名称	参数
蓄冷回热器	9	温度/K	298.15
	10		84.05
	12		79.05
	15		293.15
	18		293.15
	19		293.15
深冷液态泵	—	绝热效率/%	85
液态泵	16	温度/K	109.15
	—	绝热效率/%	85
	14	压力/MPa	7
节流阀	11	节流压力/MPa	0.1

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耦合液化天然气的液化空气储能系统热力学分析

The thermodynamic analysis of a liquefied air energy storage system coupled with liquefied natural gas

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