摘要
提出一种压缩空气与抽水蓄能耦合的新型储能系统,包括压缩空气部分(CAES)和抽水压缩空气部分(PHCA),可实现压力能的梯级利用,改善两部分的各自运行工况,具有较高的电-电转化效率,同时也为浅层废弃隧道及洞穴利用提供了新途径。针对该系统的结构特点,首先对系统进行了热力学分析,分析表明:新型系统的电-电转化效率为53.82%,能量转化效率为41.06%;PHCA部分具有较高的效率,CAES部分具有较高的容量和储能密度。随后,对能量运转较为复杂的CAES部分进行了分析,结果表明:CAES部分的主要输入能量来自于压缩机(76.05%),最大损失发生在高压储气空间的节流(23.33%)和蓄热器的蓄热(22.9%)过程。最后,对该系统进行了敏感性分析,结果表明:增加两储气空间的压力差和提升再热温度均可以提升系统的性能,而提升再热温度的收益最大,系统的电-电转化效率最高可达77%。
The subject in this paper is a new energy storage system coupled with compressed air and pumped-hydro energy storage,including the compressed air energy storage(CAES)part and pumped-hydro compressed air(PHCA)part.With this new energy storage system,graded utilization of pressure energy could be realized,and the operating conditions of the two parts could be improved.It has high electricity-electricity conversion efficiency,and provides new ways for the utilization of shallow waste tunnels and caves.For its structural characteristics,we performed thermodynamic analysis first,and the result shows that the new system is with electricity-electricity conversion efficiency of 53.82%,and energy conversion efficiency of 41.06%;The PHCA part has higher efficiency and the CAES part has higher capacity and energy density;Then,we performed exergy analysis on the CAES part with complex energy flow,and the result shows that the main input energy of the CAES part is from the compressor(76.05%),and the maximum loss occurs in the throttling(23.33%)of the high pressure air storage space and the heat storage(22.90%)process of the accumulator;Finally,we performed a sensitivity analysis on the system,and the result shows that increasing the pressure difference between the two storage spaces and the reheat temperature can improve the performance of the system,among which increasing the reheat temperature contributes the most.The electricity-electricity conversion efficiency of the system could be up to 77%.
作者
李丞宸
贺新
陶飞跃
王焕然
LI Chengchen;HE Xin;TAO Feiyue;WANG Huanran(School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2022年第4期40-49,71,共11页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51676151)。
关键词
压缩空气储能系统
抽水蓄能
热力学分析
可再生能源
compressed air energy storage system
pumped-hydro energy storage
thermodynamic analysis
renewable energy
