Performance Analysis of a Near-Isothermal Compressed Carbon Dioxide Energy Storage System with Near Constant Discharge Process

被引：1
|
作者：
Zhao P. [1 ]
Zhang S. [1 ]
Xu W. [1 ]
Wu W. [1 ]
Liu A. [1 ]
Wang J. [1 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2023年 / 57卷 / 01期
关键词：
compressed CO[!sub]2[!/sub] energy storage; gas/liquid phase change; near constant discharge process; near-isothermal process;
D O I：
10.7652/xjtuxb202301004
中图分类号：
学科分类号：
摘要：
In order to supply(near)stable electricity to some small-scale special load, a near-isothermal compressed CO2 energy storage system with near constant discharge process is proposed in this paper based on the basic principle of near-isothermal compressed air energy storage by applying the liquid piston, the heat transfer method via helical coil in pressure vessel wall and the gas/liquid phase change process. Firstly, the thermodynamic analysis models of the core components of this system are established and the performance indicators are given. Then, the performance analysis in the initial round trip cycle of such system is analyzed. The parameter sensitivity analysis is also conducted, including the parameters of initial pressure of pressure vessel, maximum pressure of pressure vessel and water temperature in helical coil. Finally, the effect of heat transfer with and without helical coil configuration(on system performance is carried out. The results show that the round trip efficiency, thermal efficiency and energy density of the system are 62.67%, 53.05% and 0.500 3 kW·h·m-3, respectively. Meanwhile, the system also exhibits a near constant power output in the discharge process, which varies between 636 and 840 kW. The work of this paper can enrich the theoretical system of compressed gas energy storage, and has important practical value and significance. © 2023 Xi'an Jiaotong University. All rights reserved.
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页码：34 / 44
页数：10
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