跨临界CO_(2)储能系统中填充床蓄冷性能的动态分析  

Dynamic analysis of the performance offilled-bed cooling storage in transcritical carbon dioxide energy storage

作　　者：姚小彦 陈晓文[1] 黄勇 黄研[1] 刘鹏虎 程祖田 王焕然[3] YAO Xiaoyan;CHEN Xiaowen;HUANG Yong;HUANG Yan;LIU Penghu;CHENG Zutian;WANG Huanran(Huanghe Hydropower Development Co.,Ltd.,Xining 810008,China;POWER CHINA Henan Electric Power Survey&Design Institute Co.,Ltd.,Zhengzhou 450007,China;School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]黄河上游水电开发有限责任公司,西宁810008 [2]中国电建集团河南省电力勘测设计院有限公司,郑州450007 [3]西安交通大学能源与动力工程学院,西安710049

出　　处：《流体机械》2024年第6期49-57,共9页Fluid Machinery

基　　金：陕西省自然科学基础研究项目(2021JQ-047)。

摘　　要：为进一步提升CO_(2)储能系统性能,建立了不同换热阶段CO_(2)与填充床的换热模型,探究了填充床长度等关键设计参数对蓄冷单元的影响规律。结果表明:由于温跃区的存在,初次循环中存储在蓄冷材料内的大量冷量未被利用,导致其㶲效率较低。随着循环次数的增加,温跃区向后移动,蓄冷单元的㶲效率不断增加。在第15次循环后,蓄冷单元的冷量回收效率和㶲效率稳定在96.10%和82.44%。与填充床长度相比,填充床直径对其温度分布影响较大。本研究可为跨临界CO_(2)储能系统填充床的工程应用提供理论指导。In order to further improve the performance of the carbon dioxide energy storage system,the heat transfer model of carbon dioxide and filled bed at different heat transfer stages was established,and the influence law of key design parameters such as the length of the filled bed on the cold storage unit was explored.The results show that,due to the existence of the thermocline region,a large amount of cold stored in the cold storage material in the initial cycle is not utilized,resulting in a low exergy efficiency.As the number of cycles increases,the thermocline region moves backward,and the exergy efficiency of the cold storage unit increases.After 15 cycles,the cold recovery efficiency and the exergy efficiency of the refrigeration unit are stabilized at 96.10%and 82.44%.Compared with the length of the filled bed,the diameter of the filled bed has a greater influence on its temperature distribution.This study can provide theoretical guidance for the engineering application of filled beds in transcritical CO_(2) energy storage systems.

关 键 词：压缩CO_(2)储能 填充床 㶲分析 蓄冷性能 

分 类 号：TH45[机械工程—机械制造及自动化] TK02[动力工程及工程热物理]