Performance Analysis of a Transcritical Compressed CO<sub>2</sub> Energy Storage System Based on Liquid Storage

WAN Yuke; WU Chuang; LIU Chao; FU Zhengbu; JIANG Xuhui; XUE Xiao; HE Jiajun

doi:10.7652/xjtuxb202301003

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Performance Analysis of a Transcritical Compressed CO₂ Energy Storage System Based on Liquid Storage

更新时间：2025-07-09

- Performance Analysis of a Transcritical Compressed CO₂ Energy Storage System Based on Liquid Storage
- Vol. 57, Issue 1, Pages: 25-33(2023)
- 作者机构：
  
  1. 重庆大学低品位能源利用技术及系统教育部重点实验室,重庆,400044
  2. 重庆大学能源与动力工程学院,重庆,400044
  3. 国能长源汉川发电有限公司, 431614, 湖北汉川
  4. 中国电建集团重庆工程有限公司,重庆,400060
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202301003
  CLC： TK11
- Online First：10 January 2023，
  
  Published：2023
- 稿件说明：
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WAN Yuke, WU Chuang, LIU Chao, et al. Performance Analysis of a Transcritical Compressed CO₂ Energy Storage System Based on Liquid Storage[J]. 2023, 57(1): 25-33. DOI: 10.7652/xjtuxb202301003.
DOI：

WAN Yuke, WU Chuang, LIU Chao, et al. Performance Analysis of a Transcritical Compressed CO₂ Energy Storage System Based on Liquid Storage[J]. 2023, 57(1): 25-33. DOI: 10.7652/xjtuxb202301003. DOI：

摘要

为了深入研究能量密度高、受地理条件限制少的液态CO

储能系统的性能

提出了一种新型液态存储跨临界压缩CO

储能系统。该系统采用蓄能装置存储过程中产生的热能与冷能

同时利用高低压储罐以液态存储CO

从而提高系统的储能效率和能量密度。对该系统进行了热力学分析与多目标优化

仿真结果表明:在典型设计工况下

蓄冷器、压缩机和膨胀机有较大的损

分别占总损的24.09%、25.40%和23.82%。参数分析表明:该系统的储能效率随高压储罐压力、低压储罐压力、泵增压、蓄热水分流比的增大先增加后减小

意味着这些参数存在最优值

但储能效率随节流阀压降的增加而减小; 增加高压储罐压力、节流阀压降、泵增压或降低低压储罐压力有利于提升系统能量密度

并且存在最佳的蓄热水分流比使系统能量密度最大。此外

多目标优化结果表明

系统的最优储能效率和能量密度分别为58.79%和17.85 kW·h·m

-3

。

Abstract

To further study the performance of a liquid CO

energy storage system with high energy density and less restriction on geographical conditions

a novel liquid CO

energy storage system is proposed in this paper. This novel energy storage system uses the energy storage device to store the heat and cold energy generated in the processes and uses the high and low-pressure storage tanks to store CO

in the liquid state

to improve the energy storage efficiency and energy density of the system. In this paper

the thermodynamic analysis and multi-objective optimization of the system are carried out. The simulation results show that the cold storage unit

compressors

and turbines have relatively high exergy destruction

accounting for 24.09%

25.40%

and 23.82% of the total system exergy destruction

respectively. Parameter analysis shows that the system energy storage efficiency increases first and then decreases with the increases of the high-pressure storage tank pressure

the low-pressure storage tank pressure

the pump pressurization

and the split ratio of the hot water storage

which means that there are possible optimal values of these above parameters for maximizing the system energy storage efficiency. However

the energy storage efficiency decreases with the increase of the pressure drop of the throttle valve. The energy density of the energy storage system can be improved by increasing the pressure of the high-pressure storage tank

the pressure drop of the throttle valve

the pressure of the pump

or reducing the pressure of the low-pressure storage tank. In addition

there is a possible optimal mass flow split ratio of the heat storage water for maximizing the energy density of the system. Multi-objective optimization results reveal that the optimal energy storage efficiency and energy density of the system are 58.79% and 17.85 kW·h·m

-3

respectively.

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⁰

Performance Analysis of a Transcritical Compressed CO2 Energy Storage System Based on Liquid Storage

DOI：10.7652/xjtuxb202301003

摘要

Abstract

关键词

Keywords

references

Performance Analysis of a Transcritical Compressed CO₂ Energy Storage System Based on Liquid Storage