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

doi:10.19799/j.cnki.2095-4239.2021.0184

Abstract

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

CLC Number:

TQ 028.8

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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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