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

ZHAO Pan; ZHANG Shiqiang; XU Wenpan; WU Wenze; LIU Aijie; WANG Jiangfeng

doi:10.7652/xjtuxb202301004

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

更新时间：2025-07-09

- Performance Analysis of a Near-Isothermal Compressed Carbon Dioxide Energy Storage System with Near Constant Discharge Process
- Vol. 57, Issue 1, Pages: 34-44(2023)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202301004
  CLC： TK02
- Online First：10 January 2023，
  
  Published：2023
- 稿件说明：
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ZHAO Pan, ZHANG Shiqiang, XU Wenpan, et al. Performance Analysis of a Near-Isothermal Compressed Carbon Dioxide Energy Storage System with Near Constant Discharge Process[J]. 2023, 57(1): 34-44.
DOI：

ZHAO Pan, ZHANG Shiqiang, XU Wenpan, et al. Performance Analysis of a Near-Isothermal Compressed Carbon Dioxide Energy Storage System with Near Constant Discharge Process[J]. 2023, 57(1): 34-44. DOI： 10.7652/xjtuxb202301004.

摘要

为满足小容量特殊负载对(近似)稳定电能供应的需求

本文遵循(近似)等温压缩空气储能的基本原理

采用液压活塞和压力容器壁内置螺旋盘管换热的方式

基于气/液相变过程

提出了具备近似等压放电过程的近似等压等温压缩CO

储能系统。通过建立系统核心部件的热力学分析模型与性能评价指标

分析了该系统在初次充放电循环中的性能

探究了压力容器初始压力、最大压力和螺旋盘管水温等参数变化时的系统性能

探索了系统有、无螺旋盘管换热对性能的影响规律。结果表明

该系统在初次充放电循环中充放电效率、热效率和能量密度分别为62.67%、53.05%和0.500 3 kW·h·m

-3

。同时

该系统在放电过程中可以获得近似恒定的电能输出

输出功率在636～840 kW范围内变化。本文的研究工作可丰富压缩气体储能理论体系

具有重要的实用价值和现实意义。

Abstract

In order to supply(near)stable electricity to some small-scale special load

a near-isothermal compressed CO

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 p

erformance 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.

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references

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