基于压缩空气储能的新型冷热电联供系统性能研究

Research on the Performance of a Novel Combined Cooling,Heating and Power System based on Compressed Air Energy Storage System

为了解决用户负荷需求在时间上的变动和传统冷热电联供(Combine Cooling,Heating&Power,CCHP)系统大部分时间处于非设计工况下运行导致系统的能源利用效率较低的问题,提出了一种耦合压缩空气储能系统(Compressed Air Energy Storage system,CAES)和蓄热装置的新型CCHP系统(CAES based CCHP system,CAES-CCHP),建立系统的热力学模型,在给定的充、放电工作条件下对CAES-CCHP系统的热力学性能进行分析,并对影响该系统性能的CAES压气机压缩比、透平进气口压力、流经CAES的烟气质量流量3个关键参数进行敏感性分析。研究结果表明:CAES-CCHP系统能实现冷热电灵活调控,且系统的CAES功转换效率为57.41%,一次能源利用率、一次节能率及火用效率分别为76.22%,24.84%和31.97%,比传统的CCHP系统分别提高10.97%,18.15%和7.58%。

In order to solve the problems of low energy utilization efficiency of the system caused by the change of user load demand with the time and the traditional combined cooling,heating and power(CCHP)system running under off-design conditions most of the time,a novel CAES based CCHP(CAES-CCHP)system coupling compressed air energy storage system(CAES)and heat storage device was proposed.By establishing the thermodynamic model of the system,the thermodynamic performance of the CAES-CCHP system was analyzed under the given working conditions of charge and discharge,and the sensitivity analysis of three key parameters that affected the performance of the system was carried out,such as CAES compressor compression ratio,turbine air intake pressure and flue gas mass flow through CAES.The results show that the CAES-CCHP system can realize flexible regulation of cooling,heating and power generation,and the CAES power conversion efficiency of the system is 57.41%,while the primary energy utilization rate,primary energy saving rate and exergetic efficiency are 76.22%,24.84% and 31.97%,respectively,which are 10.97%,18.15% and 7.58% higher than that of the traditional CCHP system.