耦合LNG及ORC的液态空气储能系统热力学分析

doi:10.19799/j.cnki.2095-4239.2022.0474

储能科学与技术 ›› 2023, Vol. 12 ›› Issue (1): 155-164.doi: 10.19799/j.cnki.2095-4239.2022.0474

耦合LNG及ORC的液态空气储能系统热力学分析

肖力木¹(), 高欣²(), 张世海³^,⁴(), 文贤馗⁴

^1.贵州大学电气工程学院，贵州贵阳 550025
^2.贵州大学物理学院，贵州贵阳 550025
^3.贵州创星电力科学研究院有限责任公司，贵州贵阳 550081
^4.贵州电网有限责任公司电力科学研究院，贵州贵阳 550002

收稿日期:2022-08-23 修回日期:2022-09-07 出版日期:2023-01-05 发布日期:2023-02-08
通讯作者: 高欣,张世海 E-mail:2390238318@qq.com;gaoxin0526@163.com;494350038@qq.com
作者简介:肖力木（1998—），男，硕士研究生，研究方向为压缩空气储能技术及控制优化，E-mail：2390238318@qq.com；
基金资助:
国家重点研发计划项目(2017YFB0903604);贵州省科技厅科技支撑计划资助项目(黔科合支撑〔2020〕2Y064);国家自然科学基金项目(11965007)

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

Limu XIAO¹(), Xin GAO²(), Shihai ZHANG³^,⁴(), Xiankui WEN⁴

^1.The Electrical Engineering College, Guizhou University, Guiyang 550025, Guizhou, China
^2.College of physics, Guizhou University, Guiyang 550025, Guizhou, China
^3.Guizhou Chuangxing Electric Power Research Institute Co. , Ltd. , Guiyang 550081, Guizhou, China
^4.Electric Power Research Institute of Guizhou Power Grid Co. , Ltd. , Guiyang 550002, Guizhou, China

Received:2022-08-23 Revised:2022-09-07 Online:2023-01-05 Published:2023-02-08
Contact: Xin GAO, Shihai ZHANG E-mail:2390238318@qq.com;gaoxin0526@163.com;494350038@qq.com

摘要/Abstract

摘要：

为了提高液态空气储能系统(B-LAES)的循环效率及压缩热的利用率，将液态天然气的冷能合理利用起来，提出了一种耦合液态天然气(LNG)和有机朗肯循环(ORC)实现冷热电三联供的液态空气储能系统，从导热油中压缩热的利用率、循环效率、电-电转化效率、?效率几方面对本系统进行分析。研究结果表明，通过合理综合利用导热油中的压缩热，压缩热利用率可达到96.67%，比B-LAES系统高约55%；通过耦合利用液态天然气(LNG)的冷能，系统循环效率可达93.20%，比B-LAES系统提高约16.9%；增加ORC系统可使系统电-电转化效率达81.34%，比B-LAES系统提高约42.2%。研究结果可为液态空气储能理论研究和应用提供一定的技术参考。

关键词: 液态空气储能, 有机朗肯循环, 冷热电联供, 循环效率, 压缩热利用率

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

中图分类号:

TK 02

肖力木, 高欣, 张世海, 文贤馗. 耦合LNG及ORC的液态空气储能系统热力学分析[J]. 储能科学与技术, 2023, 12(1): 155-164.

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.

图/表 12

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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

耦合LNG及ORC的液态空气储能系统热力学分析

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

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Metrics

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设备	功率/kW	设备	功率/kW
AC1	3772.09	AT1	1625.24
AC2	3792.34	AT2	1616.43
AC3	3794.11	AT3	1609.77
AC4	3806.60	AT4	1601.47
OP1	8.54	ORCT	6421.44
OP2	4.18	LP	235.78
PP	369.98	LNGP	1.96
ORCP	43.13	—	—

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