Analysis of novel liquefied-air energy-storage system coupled with LNG cold energy and ORC

doi:10.19799/j.cnki.2095-4239.2021.0700

Abstract

Abstract:

This paper proposes a novel liquefied-air energy-storage system that is coupled to liquefied natural gas (LNG) cold energy and organic rankine cycle (ORC) system. During off-peak period, the cold energy from LNG and liquid propane operate together to liquefy compressed air and store energy. During peak times, liquid air is released to generate electricity, and the cold energy of LNG is recovered by propane. The system combines the cold energy released by continuous gasification of LNG as auxiliary energy and the energy-storage system, which can flexibly release energy for power generation. In addition, the system employs cascade operation of the LNG cold energy (the cold energy is sequentially used for liquefied air, ORC, and data-center cooling), which improves the energy utilization rate and minimizes energy loss. By developing thermodynamic and economic-evaluation models of the coupled system, the proposed system was simulated using the Aspen HYSYS software, and the round-trip and exergy efficiency values are analyzed. By focusing on the regional power price of the Ningbo LNG receiving terminal in Zhejiang province, the net-present-value method was used to evaluate the economic feasibility of the system. The results demonstrated that the round-trip efficiency of the system was 110.20% higher than the recent related research results. The exergy efficiency was 59.71%, which was approximately 10% higher than that of conventional liquefied-air energy-storage system. The energy-storage project is economically feasible, and the peak-time electricity price exerts the largest effect on the economic benefits of the system. This research can provide important reference and basis for engineering application of LNG cold energy for energy storage and peak regulation in power plants.

Key words: liquefied air energy storage, LNG cold energy, round trip efficiency, exergy efficiency, economic evaluation, ORC system

CLC Number:

TE 09

SU Yaogang, WU Xiaonan, LIAO Borui, LI Shuang. Analysis of novel liquefied-air energy-storage system coupled with LNG cold energy and ORC[J]. Energy Storage Science and Technology, 2022, 11(6): 1996-2006.

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参数	数值
LNG进口温度/K	111
LNG进口压力/MPa	0.1013
LNG质量流量/(kg/s)	0.5
NG出口压力/MPa	7
进口空气质量流量/(kg/s)	0.694
空压机组出口压力/MPa	3.5
液态空气泵出口压力/MPa 四级空气膨胀机组出口压力/MPa	12 0.1013
液态丙烷质量流量/(kg/s)	1.28
海水温度/K	288
膨胀机额定效率	0.85
压缩机额定效率	0.85
低温泵机额定效率	0.80

序号	质量流量/(kg/s)	温度/K	压力/MPa	序号	质量流量/(kg/s)	温度/K	压力/MPa
1	0.5	111	0.101	16	0.694	243.85	3.535
2	0.5	114.56	7.5	17	0.694	153.26	3.5
3	0.5	141.33	7.44	18	0.694	94.6	3.5
4	0.5	163.96	7.36	19	0.694	78.77	0.101
5	0.5	178.44	7.28	20	0.694	78.77	0.101
6	0.5	192.72	7.21	21	0.694	78.77	0.101
7	0.5	230.64	7.14	22	0.694	85.10	12
8	0.5	248.42	7.07	23	0.694	288	11.88
9	0.5	288	7	24	0.694	211.13	3.60
10	0.694	298	0.101	25	0.694	288	3.56
11	0.694	183.08	0.100	26	0.694	214.09	1.08
12	0.694	272.87	0.333	27	0.694	288	1.06
13	0.694	173.06	0.330	28	0.694	215.82	0.32
14	0.694	257.74	1.085	29	0.694	288	0.32
15	0.694	163.05	1.074	30	0.694	218.51	0.101

设备	功率/kW	设备	功率/kW
P1	10.52	Tur1	39.83
P2	9.86	Tur2	42.24
P3	0.35	Tur3	42.94
Comp1	58.68	Tur4	42.08
Comp2	55.72	Tur5	22.46
Comp3	50.38	—	—

耦合LNG冷能的液化空气储能系统	参考文献	循环效率/%
LNG-LAES	[19]	67.60
Hybrid LAES	[20]	70.51
LAES-Brayton-LNG	[21]	70.60
MCES	[22]	85.10
LPCES	[23]	95.20
本研究	—	110.20

设备		输入㶲/kW	输出㶲/kW	㶲损/kW	㶲效率/%
泵	P1	10.52	2.41	8.11	22.91
	P2	9.86	4.69	5.17	47.57
	P3	0.35	0.23	0.12	65.71
压缩机	Comp1	58.68	49.49	9.19	84.33
	Comp2	55.72	46.18	9.54	82.88
	Comp3	50.38	42.22	8.16	83.80
膨胀机	Tur1	48.40	39.83	8.57	82.29
	Tur2	50.59	42.24	8.35	83.49
	Tur3	51.58	42.94	8.64	83.25
	Tur4	50.29	42.08	8.21	83.67
	Tur5	25.95	22.46	3.49	86.55