新型耦合太阳能液化空气储能系统性能研究  

Performance Study on a New Liquid Air Energy Storage System Coupled with Solar Energy

作　　者：王军[1] 王浩博 佟勇婧 池立勋 黄 张汉飞 段立强 Wang Jun;Wang Haobo;Tong Yongjing;Chi Lixun;Huang Yan;Zhang Hanfei;Duan Liqiang(PetroChina Planning and Engineering Institute,Beijing 100083,China;PetroChina Kunlun Gas Co.,Ltd.,Beijing 101399,China;Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education(North China Electric Power University),Beijing 102206,China)

机构地区：[1]中国石油天然气股份有限公司规划总院,北京100083 [2]中石油昆仑燃气有限公司,北京101399 [3]电站能量传递转化与系统教育部重点实验室(华北电力大学),北京102206

出　　处：《电站辅机》2024年第4期1-10,共10页Power Station Auxiliary Equipment

基　　金：中石油昆仑燃气有限公司科学研究与技术开发项目(2023-KLKJ-10)。

摘　　要：液化空气储能(LAES)技术因其储能密度高、不受地理条件限制等优点,在平抑可再生能源电力的间歇性和波动性等方面表现出色。太阳能作为一种清洁的可再生能源,可有效提升液化空气储能系统的热力学性能。基于Mg(OH)_(2)/MgO热化学热反应体系,本文提出一种新型耦合太阳能的液化空气储能(LAES)系统。其在释能阶段,空气在进入透平做功发电前所吸收的热量不仅来源于储能阶段产生的空气间冷压缩热,也来源于太阳能热驱动Mg(OH)_(2)分解后得到的高温蒸汽和高温MgO;同时剩余的空气间冷压缩热驱动热电发电机产生额外电力。研究结果表明,与基准LAES系统相比,新型LAES系统的输出功率提高了10.5MW;电往返效率从46.81%提高到56.96%。节流阀的阀前温度和阀前压力决定了空气液化率,随着阀前温度升高,液化率达到峰值时对应的阀前压力同步升高。此外,本文还研究了压缩机级数以及MgO和高温蒸汽的分流分率对系统性能的影响。The liquid air energy storage(LAES)technology,with high energy storage density and independence from geographical constraints,excels in smoothing intermittency and variability of renewable energy electricity.Solar energy,as a clean renewable energy source,could effectively enhance the thermodynamic performance of the LAES system.Based on the Mg(OH)_(2)/MgO thermochemical reaction system,a novel solar-coupled LAES system was proposed in this study.During the energy release period,the heat absorbed by the air before entering the turbines not only comes from the intercooling heat of the air but also from the hightemperature steam and MgO produced by the solar-driven Mg(OH)_(2)decomposition.Besides,the remaining intercooling heat of the air is employed to drive a thermoelectric generator to produce additional electricity.Research findings show that compared to the baseline LAES system,the new LAES system increases 10.5 MW in power output,with the system's round-trip efficiency rising from 46.81% to 56.96%.The air liquefaction rate was determined by the pre-valve temperature and pressure,with the pressure corresponding to the peak air liquefaction rate increasing when the pre-valve temperature rises.In addition,this study also investigated the impact of the air compressors'stage and the spliting fraction of MgO and high-temperature steam on the system performance.

关 键 词：太阳能 液化空气储能 耦合特性 热力学性能 

分 类 号：TK51[动力工程及工程热物理—热能工程] TK02