System Simulation Study on Performance of Non-Supplementary Combustion Liquid Compressed Air Energy Storage System

doi:10.12096/j.2096-4528.pgt.24030

Abstract

Abstract:

Objectives Compressed air energy storage is a type of energy storage technology with large capacity, long cycle, low cost and high efficiency. Due to the strict requirements of gas storage chambers, gaseous compressed air energy storage cannot be widely promoted and applied in multiple scenarios and on a large scale. Therefore, a non-supplementary combustion liquid compressed air energy storage system was proposed. Methods A theoretical calculation model was constructed to conduct sensitivity analysis on key parameters such as compressor interstage temperature, number of compressor stages, and turbine inlet temperature within the system. The results were compared with those of a non-supplementary combustion gaseous compressed air energy storage system. Results Too low or too high interstage temperature in compressors will restrict the improvement of electric-electric conversion efficiency of the system. The number of compressor stages is positively correlated with compressor power consumption, and negatively correlated with the turbine power generation. Under the same inlet pressure, the higher the inlet air temperature of the turbine is, the larger the power generation is, and the higher the electric-electric conversion efficiency is. Compared with the non-supplementary combustion gaseous energy storage system, the density of non-supplementary combustion liquid energy storage system is increased by 3.7 times, and the volume of the storage chamber is decreased by 9/10. Conclusions The non-supplementary combustion liquid compressed air energy storage system effectively solves the problem of gas storage chambers, enabling compressed air energy storage technology to be promoted and applied in multiple scenarios and on a large scale. It is of great significance for deep peak shaving of thermal power units and large-scale energy storage in power grids.

Key words: energy storage, peak shaving, non-supplementary combustion, gaseous compressed air energy storage, liquid compressed air energy storage

CLC Number:

TK 02

Haimin JI, Lei XUE, Fangsheng ZHOU, Dian WANG, Cheng CHEN, Jing LI, Hui LIU, Ning XUE, Zhixiang ZHANG, Dangqi XU. System Simulation Study on Performance of Non-Supplementary Combustion Liquid Compressed Air Energy Storage System[J]. Power Generation Technology, 2024, 45(5): 910-918.

Figures/Tables 16

Fig. 1 Schematic diagram of non-supplementary combustion liquid compressed air energy storage system

Fig. 2 Physical model of non-supplementary combustion liquid air energy storage system

Tab. 1 Boundary parameters of non-supplementary combustion compressed air energy storage system

参数	数值
第一级压缩机入口空气温度/℃	20
第一级压缩机入口空气压力/MPa	0.1
储能压缩压力等级/MPa	8.1
压缩机等熵效率/%	85
压缩机机械效率/%	98
蓄热器能量利用率/%	85
换热器端差/℃	20
导热油初始温度/℃	20
储能液态空气量/kg	15 500
储罐液态空气压力/MPa	2
储罐液态空气温度/℃	-155
液态空气密度/(kg/m³)	821
储罐尺寸/m	Φ4×5
液泵效率/%	80
液泵驱动效率/%	98
液泵出口压力等级/MPa	8.1
蓄冷器能量利用率/%	85
膨胀机级数	3
膨胀比	4
膨胀机等熵效率/%	85
膨胀机机械效率/%	98

Tab. 2 Temperature parameters of different compressor interstages

参数	工况1	工况2	工况3
压缩级数	4	4	4
压缩机级间温度/℃	45	65	85

Fig. 3 Relationship between compressor interstage temperature and electric power consumed by compressor

Fig. 4 Relationship between compressor interstage temperature and turbine power generation

Fig. 5 Relationship between compressor interstage temperature and electric-electric conversion efficiency and energy storage density

Tab. 3 Operating parameters of different compressor stages

参数	工况4	工况5	工况6
压缩级数	5	4	3
压缩机级间温度/℃	65	65	65
液泵消耗的电功率/kW	53	53	53

Fig. 6 Relationship between number of compressor stages and electric power consumed by compressor

Fig. 7 Relationship between number of compressor stages and turbine power generation

Fig. 8 Relationship between number of compressor stages and electric-electric conversion efficiency and energy storage density

Tab. 4 Different turbine inlet temperature parameters

参数	工况6	工况7	工况8
压缩级数	3	3	3
压缩机级间温度/℃	65	65	65
液泵消耗电功率/kW	53	53	53
一级透平入口温度/℃	301	351	401
二级透平入口温度/℃	279	329	379
三级透平入口温度/℃	196	246	296
外界输入热量/kW	0	342	689

Fig. 9 Relationship between turbine inlet temperature and power generation

Fig. 10 Relationship between turbine inlet air temperature and electric-electric conversion efficiency and energy storage density

Tab. 5 Boundary parameters of two types of energy storage systems

参数	非补燃液态	非补燃气态
压缩压力等级/MPa	8.1	8.1
压缩级数	3	3
压缩机级间温度/℃	65	65
储存物质状态	液态	气态
储存温度/℃	-155	20
储存压力/MPa	2	8.1
储存物质密度/(kg/m³)	821	87
储存质量/kg	15 500	15 500
液泵消耗电功率/kW	53	0

Fig. 11 Comparison of turbine power generation of two compressed air energy storage systems

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