火电厂热电联产机组与液态CO_(2)储能耦合系统热力性能分析  

Thermal performance analysis of the coupled system of cogeneration unit and liquid carbon dioxide energy storage system

作　　者：王妍 王洋 吕凯[1,2] 郑郝 金森 俞骏 邹莹 马汀山 WANG Yan;WANG Yang;LYU Kai;ZHENG Hao;JIN Sen;YU Jun;ZOU Ying;MA Tingshan(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;Xi’an TPRI Energy Conservation Technology Co.,Ltd.,Xi’an 710054,China;China Huaneng Group Co.,Ltd.,Beijing 100031,China;School of Foreign Studies,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]西安西热节能技术有限公司,陕西西安710054 [3]中国华能集团有限公司,北京100031 [4]西安交通大学外语学院,陕西西安710049

出　　处：《热力发电》2023年第8期40-50,共11页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ21-H59)。

摘　　要：煤电机组耦合储能系统可以提升机组的调峰能力。为提高热电联产机组的热电解耦能力,提出一种火电厂热电联产机组与液态CO_(2)储能耦合系统。该系统利用凝结水收集储能过程中CO_(2)压缩热,并与供热抽汽共同向用户供热,同时利用供热抽汽预热释能过程中膨胀机入口CO_(2)。基于建立的系统热力学模型,以耦合系统热效率、㶲效率和储能系统电-电效率为评价指标,开展了系统热力性能分析。敏感性分析结果表明:增大膨胀机入口温度和释能压力都可以获得更高的系统㶲效率和电-电效率;增大储能压力可以获得更高的系统热效率,㶲效率则先升高后降低。在设定参数下对相应CO_(2)储能系统进行参数优化。结果表明:当储能压力约为10.5 MPa、释能压力约为18 MPa时,耦合系统取得最优㶲效率为64.92%。Coupled with the energy storage system can improve the peak shaving capacity of the thermal power unit.To improve the thermoelectric decoupling ability of the combined heat and power unit,a coupled thermal power plant combined heat and power unit with liquid carbon dioxide energy storage system is proposed.The system utilizes the condensate to recover the compression heat of the carbon dioxide during the charge process,and supplies heat to the users together with the heating extraction steam.Besides,the heating extraction steam is employed to preheat the carbon dioxide of the expander inlet during the discharge process.Based on the established thermodynamic models,the thermal performance analysis of the coupled system was carried out with the thermal efficiency,exergy efficiency,and electricity storage efficiency as assessment criteria.The sensitivity analysis results indicate that increasing both the expander inlet temperature and the discharge pressure can obtain a higher system exergy efficiency and electricity storage efficiency;increasing the charge pressure results in a higher system thermal efficiency,while the exergy efficiency first increases and then decreases.The parameter optimization of the corresponding CO_(2)energy storage system was carried out under the design parameters.Results show that when the charge pressure is 10.5 MPa and the discharge pressure is 18 MPa,the coupled system achieves the optimal efficiency of 64.92%.

关 键 词：热电联产 液态CO_(2)储能 热力性能分析 参数优化 

分 类 号：TM621[电气工程—电力系统及自动化]