Analysis and multi-objective optimization of CAES system

doi:10.19799/j.cnki.2095-4239.2020.0273

Abstract

Abstract:

To address the problem of mutually restricted thermodynamic and economic performance of CAES systems, both factors were considered in this paper to optimize the system. Thermodynamic and economic models of the system were established and the influence of key node parameters on the system were revealed. A multi-objective optimization analysis with a genetic algorithm was carried out. The studies indicated that the thermodynamics and economics of the system increase with an increase in the expansion ratio and inlet temperature of the turbine. The optimized results indicated that a solution with an exergy efficiency of 55.12% and a unit energy cost of 396.60 $/kW is attainable for the system.

Key words: compressed air energy storage, thermodynamic analysis, economic analysis, multi-objective optimization

CLC Number:

TK 9

Lei HOU, Zichi WANG, Yingchao LI, Saihao WANG, Yajie ZHANG, Yusen ZHANG. Analysis and multi-objective optimization of CAES system[J]. Energy Storage Science and Technology, 2021, 10(1): 379-384.

Figures/Tables 11

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参数	数值
环境温度/K	298.15
环境压力/kPa	101
空气绝热系数	1.4
压缩比	8.44
透平1膨胀比	4
透平2膨胀比	7.8
压缩机效率	0.8
透平效率	0.86
换热器效率	0.9
燃烧室效率	0.95
透平1入口温度/K	853.15
透平2入口温度/K	1098.15
储气室出口空气压力/MPa	4.2
储气室出口空气温度/K	298.15
压缩机空气质量流量/kg·s^-1	108
透平空气质量流量/kg·s^-1	417

名称	单位	上限	下限
压气机压比	-	10.13	6.75
透平1膨胀比	-	4.8	3.2
透平2膨胀比	-	6.24	9.36
透平1入口温度	K	978.78	658.52
透平2入口温度	K	1317.78	878.52
压气机等熵效率	-	0.9	0.75
透平等熵效率	-	0.9	0.75
燃烧室效率	-	0.98	0.85

名称	数值
压气机压比	6.87
透平1膨胀比	4.79
透平2膨胀比	9.34
透平1入口温度/K	968.17
透平2入口温度/K	1287.40
压气机等熵效率	0.86
透平等熵效率	0.88
燃烧室效率	0.97

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