热力发电2026，Vol.55Issue(2)：65-74,10.DOI:10.19666/j.rlfd.202510070
计及喷射器性能的压缩空气储能系统释能发电效益研究
Study on energy release power generation efficiency of CAES systems considering injector performance
摘要
Abstract
[Objective]Against the source-load imbalance caused by daily-scale periodic fluctuations in grid loads,this study investigates performance optimization methods for ejectors within compressed air energy storage(CAES)systems.The aim is to improve the overall efficiency of CAES systems in terms of power generation during energy release,as well as enhance their operational control capabilities during actual operation.In CAES systems,the ejector performs the dual functions of regulating the state parameters of the working gas and introducing low-pressure exhaust gas.This critically affects the system efficiency.[Methods]By taking a 10 MW-class CAES demonstration system under construction as the research subject,this study combines response surface methodology with Computational Fluid Dynamics(CFD)numerical simulation to analyze the ejector's entrainment performance under varying working gas pressures,entrainment exhaust gas pressures,and outlet backpressure conditions.This determines the ejector's efficient operating range.Subsequently,the volume of the storage tank is designed based on the entrainment performance results of the ejector and the variable pressure operating conditions during the energy release process of the CAES system.The power generation capacity of the CAES system is then predicted using a theoretical model.[Results]The entrainment performance of the ejector is sensitive to variations in the working gas pressure and the entrainment exhaust gas pressure.Optimal entrainment characteristics are achieved when the working gas pressure is between 10.0 and 11.75 MPa,and the entrainment exhaust gas pressure is 5.6 MPa.The outlet back pressure of the ejector significantly affects the structure of the internal flow field and the operational window of the CAES system.Higher back pressure results in a narrower operating pressure range,necessitating larger storage tank volumes and reducing energy release efficiency.When the back pressure is 8.0 MPa,the ejector operates efficiently within a working pressure range of 10.00～12.00 MPa,achieving an energy utilization efficiency rate of 10.46%.A CAES system with a 2.2×103 m3 storage tank can sustain continuous operation at design power for 4.0 hours under a back pressure of 8.0 MPa.Its energy conversion efficiency is 16.67%,with cumulative energy released for power generation reaching 5.01×104 kW·h.This represents a 2.04%improvement on systems without an ejector.[Conclusion]Defining the high-efficiency operating range of the ejector and rationally configuring the air storage tank volume can effectively enhance the power generation capabilities of the CAES system,providing a foundation for optimizing the system and formulating operational strategies in engineering practice.关键词
压缩空气储能系统/喷射器/配气策略/容积设计/发电量预测Key words
compressed air energy storage systems/jet ejector/air distribution strategy/volume design/power generation forecast引用本文复制引用
文贤馗,王维,张世海,周科,曾栋坪..计及喷射器性能的压缩空气储能系统释能发电效益研究[J].热力发电,2026,55(2):65-74,10.基金项目
国家重点研发计划(2024YFE0208100) （2024YFE0208100）
贵州省科技创新人才团队(黔科合平台人才-CXTD[2022]008) （黔科合平台人才-CXTD[2022]008）
南方电网公司重点科技项目(GZKJXM20222304) National Key Research and Development Program(2024YFE0208100) （GZKJXM20222304）
Guizhou Provincial Science and Technology Innovation Talent Team(Qiankehe Platform Talent-CXTD[2022]008) （Qiankehe Platform Talent-CXTD[2022]008）
Key Science and Technology Projects of China Southern Power Grid Company(GZKJXM20222304) （GZKJXM20222304）
