压缩sCO2储能系统动态特性仿真

doi:10.3976/j.issn.1002-4026.20230127

Abstract

Abstract:

As a novel energy storage method, compressed supercritical carbon dioxide (sCO₂) energy storage offers several advantages, such as high energy storage density, compact structure, long service life, and negative carbon emissions. Therefore, it has a broad application prospect in the energy storage and conversion. In this study, a dynamic mathematical model for the compressed sCO₂ energy storage system (SC-CCES) was established based on the mass conservation and energy conservation laws and the reliability of the model was verified. Additionally, dynamic simulations of the SC-CCES system with single-stage compression and single-stage expansion were performed using Matlab/Simulink. Under the designed operating conditions, the energy storage efficiency of the SC-CCES system was found to be 51.98%, with an energy storage density of 447.8 kWh/m³. The energy storage density of the SC-CCES system was more than 20 times higher than that of a traditional compressed air energy storage system. Furthermore, the impact of different high-pressure tank inlet pressures on system performance was analyzed. The results showed that the energy storage efficiency increases with the increase of the inlet pressure of the high-pressure storage tank, while the energy storage density is exactly the opposite. This study provides a basis for the development of compressed carbon dioxide energy storage.

Key words: compressed supercritical carbon dioxide energy storage, dynamic simulation, energy conservation, energy density

CLC Number:

TK02

JIANG Jiahui, WANG Zijie, CHI Ran, CHEN Wei, XUE Xiaodai, ZHANG Tong, ZHANG Xuelin, ZHANG Bin. Study on supercritical carbon dioxide energy storage system and its operating characteristics[J].Shandong Science, 2024, 37(4): 93-104.

Figures/Tables 16

Fig.1

Table 1

Fig.2

Fig.3

Fig.4

Table 2

Table 3

Fig.5

Table 4

Energy conservation of the compression process at P4 =40 MPa"

组件	能量	数值/kW
C	压缩功率W_C	26.54
X	换热量Q_X	-64.68
	焓差 $Δ H t o t a l$	38.13
压缩过程的总能量	-0.01

Table 4

Table 5

Energy conservation of the turbine process at P4 =20 MPa"

组件	能量	数值/kW
R	换热量Q_R	74.78
T	膨胀功率W_T	-13.50
	焓差 $Δ H t o t a l$	-61.28
膨胀过程的总能量	0.00

Table 5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

References 20

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符号	定义	单位	符号	定义	单位
P	压力	MPa	Δ	参数差值
v	比体积	m³/kg	h	效率
u	比热力学能	kJ/kg	τ	时间	s
h	比焓	kJ/kg	e	压比
s	比熵	kJ/( kg·K)	ρ	密度	kg/m^-3
q_m	质量流量	kg/s	N	缩减转速	r/min
n	转速	r/min	C_p	定压比热容	kJ·kg/K
k	绝热系数		V	体积	m³
W	功率	kW	G	缩减流量	m·s·K^0.5
Q	换热量	kW	A_U	总导热系数	kJ/K
T	温度	K

组件	设计条件下的参数	数值	组件	设计条件下的参数	数值
C	质量流量/(kg·s^-1) 转速/(r·min^-1) 压比绝热效率	0.6 9 600 5 0.8	T	质量流量/(kg·s^-1) 压比绝热效率	0.6 5 0.9
X	质量流量/(kg·s^-1) 导热油的质量流量/(kg·s^-1) 总导热系数/( kJ·K^-1)	0.6 0.270 5 4.974	LST	体积/m³ 初始压力/MPa 排气最低压力/MPa	400 8.7 8
R	质量流量/(kg·s^-1) 导热油的质量流量/(kg·s^-1) 总导热系数/( kJ·K^-1)	0.6 0.554 6 15.02	HST	体积/m³ 初始压力/MPa 最大压力/MPa 压力损失/Pa	100 20 40 600

状态点	P/MPa	T/K	v/(m³·kg^-1)	u/(kJ·kg^-1)	h/(kJ·kg^-1)	s/(kJ·kg^-1·K^-1)
1	7.983	312.30	0.003 51	371.3	399.3	1.647
2	40.000	432.00	0.001 71	415.8	484.2	1.686
3	40.000	318.15	0.001 06	234.8	277.3	1.130
4	40.000	336.20	0.001 14	265.1	310.6	1.231
5	20.140	377.30	0.002 15	391.7	435.0	1.657
6	8.700	319.20	0.003 43	376.8	406.6	1.662
7	0.101	298.15	0.001 25		685.7	0.000
8	0.101	383.30	0.001 25		881.6	0.578
9	0.101	328.90	0.001 25		756.5	0.226

Study on supercritical carbon dioxide energy storage system and its operating characteristics

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