Theoretical analysis of a novel ejector augmented compressed air energy storage system

doi:10.19799/j.cnki.2095-4239.2024.0099

Abstract

Abstract:

This study proposes a novel ejector–augmented adiabatic compressed air energy storage system designed to mitigate the significant pressure loss observed in conventional systems during constant-pressure operation. It employs a two-stage ejector to harness the exhaust gas after expansion, thereby recovering part of the lost pressure energy and enhancing the expander's inlet flow rate to boost the system's power generation capacity. We developed a thermodynamic model for this novel system and performed a comparative analysis with conventional systems using identical operating parameters. This study focuses on the effects that the primary fluid pressure, secondary fluid pressure, and intermediate pressure within the two-stage ejector have on system performance. Results reveal that increasing these pressures causes the full-cycle efficiency of the system to follow an approximate parabolic trend. Furthermore, the optimal operating parameters of the ejector have been identified. Under optimal working conditions, the system's full-cycle efficiency is 63.32%, indicating an improvement of 0.91% over the 62.41% efficiency achieved by the conventional throttling-down method. Based on the above, this study establishes a theoretical foundation for enhancing the ejector efficiency of compressed air energy storage systems, aiming to reduce throttling loss and improve overall performance.

Key words: compressed air energy storage, two-stage ejector, constant pressure operation, cycle efficiency

CLC Number:

TK 02

Zuogang GUO, Tong LIU, Min XU, Shen XU, Guangming CHEN, Xinyue HAO. Theoretical analysis of a novel ejector augmented compressed air energy storage system[J]. Energy Storage Science and Technology, 2024, 13(6): 1877-1887.

Figures/Tables 12

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参数	单位	数值
环境温度	K	293
环境压力	MPa	0.1
储气室体积	m³	7358
储气室压力范围	MPa	10~3.9
储气室充气流量	kg/s	18
储气室放气流量	kg/s	27.06
压缩机等熵效率	—	0.85
膨胀机等熵效率	—	0.88
蓄热工质比热容	kJ/(kg·K)	2100

参数	单位	数值
C1出口压力	MPa	0.49
C1出口温度	K	491.1
C2出口压力	MPa	2.22
C2出口温度	K	495.1
C3出口压力	MPa	10
C3出口温度	K	494.9
T1进气压力	MPa	3.9
T2进气压力	MPa	1.0
T3进气压力	MPa	0.26
T1、T2、T3进气温度	K	475.1
压缩机组总功率	MW	10.66
储能时间	s	28627
消耗电量	MWh	84.76
储气室空气温度	K	300
热罐工质温度	K	485
膨胀机组总功率	MW	10
释能时间	s	19042
输出电量	MWh	52.89
循环效率	%	62.41

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