Thermodynamic analysis of an advanced adiabatic compressed-air energy storage system coupled with molten salt heat and storage-organic Rankine cycle

doi:10.19799/j.cnki.2095-4239.2023.0548

Abstract

Abstract:

Advanced adiabatic compressed-air energy storage is a method for storing energy at a large scale and with no environmental pollution. To improve its efficiency, an advanced adiabatic compressed-air energy storage system (AA-CAES+CSP+ORC) coupled with the thermal storage-organic Rankine cycle for photothermal power generation is proposed in this report. In this system, the storage of heat from photothermal power generation is used to solve the problem of limited compression heat in the AA-CAES+CSP+ORC, while the medium- and low-temperature waste heat generation in the organic Rankine cycle power generation system further improves the energy storage efficiency. Here, a thermodynamic simulation model of the coupled system was initially constructed using Aspen Plus software, and the influence of two types of concentrated solar heat storage media on system performance was subsequently studied and compared. The results show that compared with thermal oil and solar salt, the system using solar salt as the concentrated solar heat storage medium had a superior performance, and the energy storage efficiency reached 115.9%. The round-trip efficiency reached 68.2%, exergic efficiency reached 76.8%, exergic conversion coefficient reached 92.8%, and energy storage density attained 5.53 kWh/m³. In addition, the study found that low ambient temperature, high inlet temperature, and high air turbine inlet pressure are conducive to improving the energy storage performance of the system.

Key words: advanced adiabatic compressed air energy storage, thermal energy storage, organic rankine cycle, thermodynamic model, exergy analysis

CLC Number:

TK 02

Hang YIN, Qiang WANG, Jiahua ZHU, Zhirong LIAO, Zinan ZHANG, Ershu XU, Chao XU. Thermodynamic analysis of an advanced adiabatic compressed-air energy storage system coupled with molten salt heat and storage-organic Rankine cycle[J]. Energy Storage Science and Technology, 2023, 12(12): 3749-3760.

Figures/Tables 15

Fig. 1

Table 1

Table 2

Table 3

Simulation results of advanced adiabatic compressed air energy storage system coupled with photothermal-organic Rankine cycle under design conditions"

性能	单位	Therminol66	太阳盐
压缩机功耗	kWh	9190	9190
空气汽轮机输出功	kWh	7235	9885
朗肯循环汽轮机输出功	kWh	880	780
泵耗功	kWh	16.21	16
太阳能集热器吸收热量	kWh	11335	12710
生产热水的热量	kWh	4350	4350
热水的温度	℃	60.5	60.5
热水的产量	t/d	106.2	106.2
太阳能折算功W_S	kWh	2480.5	2123.8
储能效率ESE	%	88.1	115.9
往返效率RTE	%	61.6	68.5
储电折合转化系数 $η E S$	%	61.1	92.8
㶲效率 $η E x$	%	68.5	76.8
储能密度EPV	kWh/m³	4.212	5.538

Table 3

Table 4

The simulation results of the system performance of the paper system and the literature system"

性能	单位	文献系统^[11]	本工作系统	本工作系统
聚光太阳能储热介质		导热油(15～400℃)	太阳盐(290～560℃)	导热油(25～345℃)
储能效率ESE	%	89.5	115.9	88.1
往返效率RTE	%	57.3	68.5	61.6
储电折合转化系数 $η E S$	%	69.3	92.8	61.1
㶲效率 $η E x$	%	69.6	76.8	68.5

Table 4

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig. 10

Fig. 11

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参数	单位	数值
环境压力	bar	1
环境温度	℃	25
压缩机等熵效率	%	80
压缩机空气质量流量	kg/s	3.6
储能时间	h	5
储气室体积	m³	2000
储气室最大压力	bar	56
储气室最小压力	bar	30
储热时间	h	1
聚光太阳能传热介质质量流量	kg/s	与工质种类有关
塔式聚光太阳能热发电效率	%	12.6
塔式聚光太阳能集热器效率	%	77.8
槽式聚光太阳能热发电效率	%	15
槽式聚光太阳能集热器效率	%	66.7
空气汽轮机等熵效率	%	85
释能时间	h	1
有机朗肯循环汽轮机入口压力	bar	6
有机朗肯循环汽轮机出口压力	bar	1.3
有机朗肯循环汽轮机等熵效率	%	80
有机朗肯循环介质R123质量流量	kg/s	与工质种类有关
换热器最小温差	℃	5

介质种类	聚光太阳能储热介质质量流量/(kg/s)	有机朗肯循环介质R123质量流量/(kg/s)	储热温度/℃	空气汽轮机入口温度/℃
Therminol66	16.5	42.35	345	335
太阳盐	35	37.5	560	550

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