摘要
为了解决以光伏为代表的可再生能源发电过程中电能输出存在的随机性和波动性问题,结合热力学基本原理提出了一种双罐式压缩空气储能系统,在此基础上利用多变指数提出了针对双罐式水气压缩系统的计算方法,建立了描述该系统工作过程的热力学模型并进行了分析,重点研究了系统中加热和再热后气体温度、多变指数、循环压缩装置进气压力和循环膨胀装置排气压力等对系统性能的影响规律。研究表明,气体加热和再热后温度的升高以及多变指数的降低均会使得电—电效率和能量效率提高;在参数选取范围内,循环压缩装置进气压力应尽量小,循环膨胀装置排气压力应尽量高;综合考虑电—电效率和系统能量效率随着热力学参数的变化,系统能量效率达到46.52%时电—电效率可以达到98.57%。该研究结果可为压缩空气储能技术和新能源发电技术发展提供理论依据。
In order to solve the problem of randomness and fluctuation in the electric energy output in the process of renewable energy power generation represented by photovoltaics,a compressed air energy storage system was proposed in combination with the basic principles of thermodynamics.A simplified calculation method for the double-tank water-gas compression system was proposed by using a polytropic exponent.The thermodynamic model describing the working process of the system was established and analyzed.The influences of the temperature of the air,polytropic exponent,the inlet pressure of the cyclic compression device and the exhaust pressure of the cyclic expansion device on the system performance were mainly studied in the system.The research results show that both the increase of temperature of the heated and reheated air and the decrease of polytropic exponent will increase the electrical-electrical efficiency and energy efficiency.Within the parameter selection range,the inlet pressure of the cyclic compression device should be as small as possible,and the exhaust pressure of the cyclic expansion device should be as high as possible.Comprehensively considering the change of the electrical-electrical efficiency and the energy efficiency of the system with the thermodynamic parameters,the electrical-electrical efficiency can reach 98.57%when the energy efficiency of the system reaches 46.52%.The research results can provide a theoretical basis for the development of compressed air energy storage technology and new energy power generation technology.
作者
贺新
李丞宸
陶飞跃
葛刚强
王焕然
HE Xin;LI Chengchen;TAO Feiyue;GE Gangqiang;WANG Huanran(Xi'an Jiaotong University,Xi'an 710049,China)
出处
《流体机械》
CSCD
北大核心
2022年第4期36-42,共7页
Fluid Machinery
基金
国家自然科学基金项目(51676151)
陕西省重点研发项目(2017ZDXM-GY-127)。
关键词
压缩空气储能
等温压缩
热力学分析
多变指数
compressed air energy storage
isothermal compression
thermodynamic analysis
polytropic exponent
