Performance simulation and analysis of an isobaric compressed air energy storage system based on Aspen Plus

doi:10.3969/j.issn.2097-0706.2024.12.009

Abstract

Abstract:

Compressed air energy storage （CAES） is an effective solution for integrating renewable energy generation into the grid and improving grid stability. To reduce the volume of the air storage reservoir and maintain stable system operation， a thermodynamic simulation model for a 100 MW×4 h isobaric compressed air energy storage （I-CAES） system was developed using the industrial process simulation software Aspen Plus. The system's performance was calculated under design conditions， and the effects of compressor outlet temperature and the number of compression-expansion stages on system operation were analyzed. The results showed that when the compressor outlet temperature was 160 ℃， the I-CAES system with 4 compression and 4 expansion stages achieved an energy storage efficiency of 62.61% and an energy storage density of 5.99 kW·h/m³. For every 10 ℃ increase in compressor outlet temperature， both the energy storage density and efficiency increased by 2.66 kW·h/m³ and 1.49 percentage points， respectively. Additionally， for each additional compression-expansion stage， the energy storage density and efficiency increased by 6.34 kW·h/m³ and 0.81 percentage points， respectively.

Key words: isobaric compressed air energy storage, renewable energy, Aspen Plus, compressor outlet temperature, compression-expansion stages, energy storage efficiency, energy storage density

CLC Number:

TK02

HU Xueru, XING Lingli, LI Yuanyuan, SU Wen, LIU Pengfei, DING Ruochen, LIN Xinxing. Performance simulation and analysis of an isobaric compressed air energy storage system based on Aspen Plus[J]. Integrated Intelligent Energy, 2024, 46(12): 72-80.

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参数	设计工况	变工况
额定功率/MW	100
发电时长/h	4
压缩机压缩时长/h	8
膨胀机等熵效率/%	90
压缩机等熵效率/%	85
膨胀机机械效率/%	97
压缩机机械效率/%	97
热罐压力/MPa	1.6
换热窄点温度/℃	10
当地大气压/kPa	101.325
压缩及膨胀级数	4	3~5
压缩机出口温度/℃	160	140~180

状态点	温度/℃	压力/MPa	质量流量/(kg·s^-1)
1	30.00	0.10	148.91
2	160.17	0.30	148.91
3	35.00	0.26	148.91
4	160.02	0.74	148.91
5	35.00	0.70	148.91
6	160.02	1.99	148.91
7	35.00	1.95	148.91
8	160.01	5.50	148.91
9	35.00	5.50	148.91
1+	150.01	1.60	35.81
2+	150.00	1.60	35.99
3+	150.00	1.60	36.41
4+	150.03	1.60	37.61
7+	150.01	1.60	145.83
7++	34.00	1.60	145.83
C1	34.00	1.60	35.81
C2	34.00	1.60	35.99
C3	34.00	1.60	36.41
C4	34.00	1.60	37.61
10	35.00	5.50	296.69
11	139.00	5.50	296.69
12	62.07	2.44	296.69
13	139.00	2.40	296.69
14	47.34	0.89	296.69
15	139.00	0.85	296.69
16	47.35	0.31	296.69
17	139.00	0.27	296.69
18	47.35	0.10	296.69
1++	59.70	1.60	75.20
2++	81.76	1.60	72.54
3++	66.80	1.60	71.61
4++	66.30	1.60	71.20
6--	68.62	1.60	290.55
8+	149.00	1.60	290.55
H1	149.00	1.60	75.20
H2	149.00	1.60	72.54
H3	149.00	1.60	71.61
H4	149.00	1.60	71.20

参数	数值
总发电量/(MW·h)	400.00
总耗电量/(MW·h)	638.85
总空气量/t	4 288.65
发电总需热水量/t	4 183.94
储电总储水量/t	4 199.86
储、发电热水量差/t	15.92
储气库体积/m³	66 792.54
储能密度/[(kW·h)·m^-3]	5.99
η_RTE/%	62.61