基于液化空气储能及ORC发电技术的集成发电系统研究  

Research on Integrated Power Generation System Based on Liquid Air Energy Storage and ORC Power Generation Technology

作　　者：唐斐然 Tang Feiran(School of Petroleum Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065

出　　处：《中外能源》2025年第2期94-100,共7页Sino-Global Energy

摘　　要：为了回收利用液化天然气(LNG)再气化过程中的冷能,构建了一种基于液化空气储能(LAES)及有机朗肯循环(ORC)发电技术的集成发电系统(LNG-ORC-LAES),充分利用LNG再气化过程所释放的冷能以及储能过程中所产生的压缩热能,并以海水作为热源应用于ORC系统与LNG再气化过程中,有效提高了空气液化率,进而增加释能阶段空气流量以提高发电量,从而提高了整个系统的循环效率与[火用]效率。选用Aspen HYSYS模拟软件,并基于Peng-Robinson状态方程,对集成系统进行模拟计算,研究关键参数对系统空气液化率、循环效率、[火用]效率的影响。结果表明:系统空气液化率受节流前温度的影响更大,随节流前温度的降低而升高;循环效率与[火用]效率随节流前空气压力的升高而升高,随节流前空气温度的升高而降低。系统中换热器用损占比最大,达到了64%,后续研究还需予以改善。当节流前空气温度为-156℃,节流前空气压力为3300k Pa,且节流后压力为1000k Pa时,系统性能达到最优。所构建系统的循环效率最高可达111.2%,[火用]效率最高可达66.49%,性能明显高于单独的常规液化空气储能系统。In order to recover and utilize the cold energy during the regasification of liquefied natural gas(LNG),an integrated power generation system(LNG-ORC-LAES)based on liquid air energy storage(LAES)and organic Rankine cycle(ORC)power generation technology was constructed to make full use of the cold energy released during LNG regasification and the compression heat energy generated during energy storage.In addition,seawater was used as a heat source in the ORC system and the LNG regasification process,which effectively increased the air liquefaction rate,and then increased the air flow at the energy release stage to increase the power generation,thus improving the cycle efficiency and exergy efficiency of the whole system.Aspen HYSYS simulation software was selected,and the integrated system was simulated based on Peng-Robinson equation of state to study the impact of key parameters on the air liquefaction rate,cycle efficiency and exergy efficiency of the system.The results show that the air liquefaction rate of the system is more affected by the temperature before throttling and increases with the decrease of the temperature before throttling.Cycle efficiency and exergy efficiency increase with the increase of air pressure before throttling and decrease with the increase of air temperature before throttling.The exergy loss of heat exchanger accounts for the largest proportion in the system,reaching 64%,and further research is needed to improve it.When the air temperature before throttling is -156℃,the air pressure before throttling is 3300kPa and the pressure after throttling is 1000kPa,the optimal performance of the system is achieved.The cycle efficiency of the system constructed reaches up to 111.2%,the exergy efficiency reaches up to 66.49%,and the performance of the system is significantly higher than that of a conventional LAES system alone.

关 键 词：LNG冷能 液化空气储能 有机朗肯循环 压缩热能 循环效率 [火用]效率 

分 类 号：TM61[电气工程—电力系统及自动化] TK02[动力工程及工程热物理]