Thermo-economic analysis of compressed air energy storage under peak load shaving condition

doi:10.19799/j.cnki.2095-4239.2021.0344

Abstract

Abstract:

Compressed-air energy storage (CAES) is one of the most promising large-scale electrical energy storage technologies. In this study, the method of exergy and economic analysis was adopted, a thermo-economic model for CAES systems was developed. The model was employed to analyze an advanced regenerative CAES system operating in a power system with a time-of-use electricity price. The results show that the system is thermo-economically feasible. Energy cost accounts for a greater portion of the total cost. For the non-energy cost, the gas storage subsystem accounts for the highest proportion, followed by the compression subsystem. Optimizing the compression subsystem significantly reduced the exergy price of the system output, followed by the storage and expansion subsystems. Therefore, to optimize the system, the thermoeconomics of the compressor should first be considered. This study provides technical and economic decision-making reference and basis for research and engineering applications of CAES systems.

Key words: compressed air energy storage, thermal-economic model, exergy analysis

CLC Number:

TK 02

Shan HU, Chang LIU, Yujie XU, Haisheng CHEN, Huan GUO. Thermo-economic analysis of compressed air energy storage under peak load shaving condition[J]. Energy Storage Science and Technology, 2021, 10(5): 1607-1613.

Figures/Tables 10

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性能参数	数值
系统输出功率/MW	10
储电时间/放电时间	4 h/4 h
系统效率/%	65
储气室容积/m³	20813
储气压力/放气压力	10 MPa/7 MPa

热力参数	数值
压缩机流量/(kg·s^-1)	34.700
压缩机进口压力/10⁵ Pa	1.000
压缩机进口温度/K	303.150
膨胀机流量/(kg·s^-1)	34.015
膨胀机进口压力/10⁵ Pa	70.000
膨胀机进口温度/K	366.150
热水罐热水温度/K	374.150
冷水罐冷水温度/K	309.650
冷热水罐压力/10⁵ Pa	4
冷却水量/(kg·h^-1)	151711.25

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