跨临界二氧化碳储能系统的热力学性质研究

doi:10.3976/j.issn.1002-4026.20240105

Abstract

Abstract:

Carbon dioxide energy storage （CCES），which has evolved from compressed air energy storage，offers advantages such as zero carbon emissions，high energy storage density，safety and reliability. To further utilize the advantages of easy liquefaction and the high energy density of carbon dioxide，a transcritical carbon dioxide energy storage system （TC-CCES） with gas-liquid two-phase changes was proposed. The low-pressure storage tank in the system contains a gas-liquid mixture that remains in transcritical state throughout the operation. Energy and exergy analyses were conducted on TC-CCES，and simulations were performed to obtain the dynamic properties of the system during its operation. In addition，the impact of the initial temperature of the high-pressure gas storage tank on the system was analyzed. The study revealed that lowering the initial temperature of the high-pressure tank enhanced the system efficiency. When the system ran in a stable state，it achieved an efficiency of 56.93% and an energy storage density is 3 510 kJ/m³.

Key words: transcritical carbon dioxide energy storage, gas-liquid two-phase, energy conservation, exergic balance, dynamic properties

CLC Number:

TK02

JIANG Jiahui, ZHANG Xuelin, LI Shuangjiang, XUE Xiaodai, CHEN Wei, ZHANG Bin. Study of thermodynamic properties of transcritical carbon dioxide energy storage system[J].Shandong Science, 2025, 38(5): 79-92.

Figures/Tables 13

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References 19

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部件	设计参数	数值	单位
LC	CO₂流量转速压比效率	0.86 9 600 4.5 0.8	kg/s r/min
HC	CO₂流量转速压比效率	0.86 9 600 4.5 0.8	kg/s r/min
LX	CO₂流量综合换热系数	0.86 8.2	kg/s kJ/K
HX	CO₂流量综合换热系数	0.86 11.5	kg/s kJ/K
LR	CO₂流量综合换热系数	0.86 20.84	kg/s kJ/K
HR	CO₂流量综合换热系数	0.86 48.12	kg/s kJ/K
LT	CO₂流量压比效率	0.86 2.6 0.9	kg/s
HT	CO₂流量压比效率	0.86 2.6 0.9	kg/s
LST	体积初始压力	142 1.5	m³ MPa
HST	体积初始压力	100 10	m³ MPa
TV1	压降	0.5	MPa
TV2	压降	10	MPa

节点	P/MPa	T/K	比体积v/（m³·kg^-1）	比焓h/（kJ·kg^-1）	比熵s/（kJ·kg·K^-1）
1	1.320	240.80	0.000 90	128.4	0.729 8
2	1.000	233.00	0.002 70	128.4	0.732 1
3	1.000	293.15	0.052 40	492.5	2.268 0
4	4.483	431.70	0.017 10	608.2	2.323 0
5	4.483	318.15	0.010 60	480.7	1.979 0
6	20.000	466.20	0.003 70	588.1	2.206 0
7	20.000	318.15	0.001 20	288.4	1.236 0
8	20.000	344.65	0.001 50	354.0	1.433 0
9	10.000	318.90	0.002 10	354.0	1.486 0
10	10.000	417.00	0.006 70	564.2	2.083 0
11	3.334	329.90	0.016 30	506.6	2.106 0
12	3.334	417.00	0.022 40	598.1	2.352 0
13	1.317	348.10	0.047 90	541.2	2.371 0
14	1.371	298.15	0.039 80	493.9	2.224 0
15	1.371	238.15	0.000 90	123.1	0.707 0
16	0.101	298.15	0.001 25	685.7	0
17	0.101	424.90	0.001 25	977.3	0.814 0
18	0.101	421.90	0.001 25	970.4	0.798 0
19	0.101	422.00	0.001 25	970.6	0.799 0
20	0.101	321.40	0.001 25	739.2	0.173 0
21	0.101	332.40	0.001 25	764.5	0.250 0

Study of thermodynamic properties of transcritical carbon dioxide energy storage system

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