Thermodynamic analysis on the liquid air energy storage system with liquid natural gas and organic Rankine cycle

doi:10.19799/j.cnki.2095-4239.2022.0474

Abstract

Abstract:

In order to increase circulation efficiency and utilization rate of the compressed heat of the liquid air energy storage (B-LAES) system and make wise use of the cold energy of the liquid natural gas, this study suggests a LAES system that can achieve the combined cooling, heating, and power supply by coupling the liquid natural gas and the organic Rankine cycle system. The system is examined from the utilization rate of the compressed heat in the heat transfer oil, the circulation efficiency, the electricity recurrence conversion efficiency, and the exergy efficiency. Through the thoughtful and thorough use of compression heat in the heat transfer oil, the utilization rate of the compression heat is as high as 96.67%, which is almost 55% greater than that of the B-LAES system. Using the cold energy of liquid natural gas through coupling, the circulation efficiency of the system can reach 93.20%, which is roughly 16.9% greater than that of the B-LAES system. Using the organic Rankine cycle system, the electrical conversion efficiency of the system can reach 81.34%, which is almost 42.2% greater than that of the B-LAES system.

Key words: liquefied air energy storage, organic Rankine cycle, supplies of cooling, heating and electrical powers, cycle efficiency, compression heat utilization

CLC Number:

TK 02

Limu XIAO, Xin GAO, Shihai ZHANG, Xiankui WEN. Thermodynamic analysis on the liquid air energy storage system with liquid natural gas and organic Rankine cycle[J]. Energy Storage Science and Technology, 2023, 12(1): 155-164.

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部件符号	部件名称	部件符号	部件名称
AC	空气压缩机	AT	空气膨胀机
AP	空气泵	ASEP	气液分离器
CB	储冷箱	CU	冷用户
DIV	分流器	Fan	风机
H	水	HE	换热器
HOT	高温导热油罐	LAT	液态空气罐
LNG	液化天然气	LNGT	液化天然气罐
LNGP	液化天然气泵	LOT	低温导热油罐
LP	液态空气泵	LTHE	低温换热器
MIX	混合器	NG User	天然气用户
O	导热油	OP	导热油泵
P	丙烷	PT	丙烷罐
PP	丙烷泵

参数	数值
空气进口质量流量/kg/s	30
空气压缩机组出口压力/kPa	7967
液态空气泵出口压力/kPa	8106
末级膨胀机出口压力/kPa	62
导热油T-66进口温度/°C	25
导热油T-66进口流量/(kg/s)	120
压缩机、膨胀机绝热效率/%	88
液态空气泵额定效率/%	70

编号	温度/K	压力/kPa	质量流量/(kg/s)	编号	温度/K	压力/kPa	质量流量/(kg/s)
A1	298.15	101.32	30.00	A18	380.03	2357.49	16.81
A2	423.63	303.97	30.00	A19	280.97	707.25	16.81
A3	299.77	300.97	30.00	A20	379.08	700.25	16.81
A4	426.02	902.92	30.00	A21	280.94	210.07	16.81
A5	299.88	893.92	30.00	A22	377.93	207.07	16.81
A6	426.55	2681.77	30.00	A23	280.30	62.12	16.81
A7	300.16	2655.77	30.00	A25	80.06	101.32	13.19
A8	427.62	7967.32	30.00	A26	82.95	101.32	43.44
A9	301.06	7888.32	30.00	A27	82.95	121.32	43.44
A10	123.15	7810.32	30.00	A28	298.15	101.32	43.44
A11	80.06	101.32	30.00	A30	303.15	152.00	30.25
A12	80.06	101.32	16.81	A31	84.19	101.32	30.25
A13	80.06	101.32	16.81	H1	298.15	101.32	118.56
A14	84.04	8105.98	16.81	H2	315.99	101.32	118.56
A15	300.30	8024.98	16.81	O1	298.15	101.32	120.00
A16	380.32	7944.98	16.81	O11	380.32	149.82	120.00
A17	279.48	2383.49	16.81	O22	348.15	114.82	120.00

设备	功率/kW	设备	功率/kW
AC1	3772.09	AT1	1625.02
AC2	3792.23	AT2	1634.83
AC3	3794.00	AT3	1636.09
AC4	3806.48	AT4	1632.92
OP1	7.03	LAP	194.17
OP2	9.03	AP	285.52
Fan	1 019	—	—

参数	数值
空气进口质量流量/(kg/s)	30
空气压缩机组的出口压力/kPa	7967
LNG进口温度/°C	-162
LNG进口压力/kPa	101.325
LNG进口流量/(kg/s)	8.20
液态泵出口压力/kPa	8106
末级膨胀机出口压力/kPa	62
导热油T-66进口流量/(kg/s)	120
导热油T-66进口温度/°C	25
压缩机、膨胀机绝热效率/%	88
液态空气泵额定效率/%	70