基于液态天然气冷能利用的液态空气储能系统优化与性能评估  

Optimization and performance evaluation for liquid air energy storage based on liquid natural gas cold energy utilization

作　　者：李俊先 刘延江 刘坤 高诏诏 陈六彪[1,2] 王俊杰 LI Junxian;LIU Yanjiang;LIU Kun;GAO Zhaozhao;CHEN Liubiao;WANG Junjie(Key Laboratory of Cryogenic Science and Technology,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;China Green Development Investment Group Co.,Ltd.,Beijing 100020,China)

机构地区：[1]中国科学院理化技术研究所低温科学与技术重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]中绿中科储能技术有限公司,北京100020

出　　处：《热力发电》2024年第9期69-77,共9页Thermal Power Generation

基　　金：国家资助博士后研究人员计划(GZC20241778);中国绿发科技创新项目(202309CHDD020)。

摘　　要：液态空气储能(LAES)具有不受地理限制和储能密度高的特点,是有潜力的大规模储能技术。为了进一步提升LAES的系统往返效率和经济效益,提出了联合液态天然气(LNG)冷能利用和有机朗肯循环(ORC)与LAES的新型集成系统。建立了集成系统的热力学和经济性评价方法,基于仿真计算探究了关键参数对系统热力性能的影响并对系统进行了经济性分析。结果表明:随着系统膨胀压力的增大,系统效率和功率输出也增加,但是增加的幅度在减小;系统往返效率随着膨胀级数先增大再减小;采用四级膨胀时,系统的效率达到了62.26%,相较于常规的LAES系统效率提升了7%~12%;当峰谷电价差为0.848元/(k W·h)时,系统的净现值、动态回收期以及平准化度电成本分别为11905.85万元、4.48年和0.893元/(k W·h)。该研究结果可为LAES系统的工程应用和效率提升提供参考和依据。Liquid air energy storage(LAES)is a promising technology for large-scale energy storage due to its geographical flexibility and high energy storage density.To further improve the round-trip efficiency and economic benefits of LAES,a novel integrated system combining liquid natural gas(LNG)cold energy utilization and organic Rankine cycle(ORC)with LAES is proposed.Thermodynamic and economic analysis methods for the integrated system are established,and the effects of key parameters on the system’s thermal performance are investigated based on simulations.An economic analysis of the system is also conducted.The results show that,as the system’s expansion pressure increases,both efficiency and power output rise,but at a decreasing rate.The system’s round-trip efficiency increases with more expansion stages up to a point,then decreases.With four-stage expansion,the system efficiency reaches 62.26%,which is 7%~12%higher than that of the conventional LAES system.When the difference between peak and valley electricity prices is 0.848 yuan/(kW·h),the net present value,dynamic payback period,and levelized cost of electricity are 119058500 yuan,4.48 years,and 0.893 yuan/(kW·h),respectively.The results of this study can provide a reference for engineering application and efficiency improvement of LAES systems.

关 键 词：液态空气储能 LNG冷能利用 有机朗肯循环 

分 类 号：TK02[动力工程及工程热物理]