摘要
发展风电、光电等可再生能源是国家战略需求.为了适配风、光等可再生能源波动性强的特征,储能系统的研究至关重要.以二氧化碳(CO_(2))为工质的热泵发电储能系统在能量密度、环境适应性和投资等方面具备优势,是备受关注的新型储能技术.本文基于提出的CO_(2)热泵发电储能系统,重点获取系统充注、热泵系统启动运行、热泵发电系统切换、发电系统启动运行的全工作阶段响应特性,提出了系统内部CO_(2)工质的质量评估方法,考察CO_(2)工质在压力容器、换热部件及管路中随全工作阶段的动态分布及容量迁移量化规律.结果表明,热泵系统在启动准备阶段其闪蒸罐及蒸发器占据CO_(2)总容量的61.2%,随着热泵系统运行,闪蒸罐内液态CO_(2)迁出,蒸发器及冷却器容量均增加,闪蒸罐气液容量分布主要受压力影响而冷却器的容量增长幅度则主要取决于运行温度.切换及发电系统运行阶段,缓存罐承担主要容量迁移,切换完成时增加4600.6 kg、运行时则降低1863.6 kg.
The development of renewable energy sources,such as wind power and photovoltaic,represents a national strategic need.In order to adapt to the highly volatile characteristics of renewable energy,such as wind and solar,the research of efficient energy storage systems is crucial.A promising candidate is the carbon dioxide(CO_(2))heat pump power generation and energy storage system,which offers substantial advantages in terms of energy density,environmental adaptability,and investment cost.This emerging technology has attracted considerable attention for its potential applications.Based on the proposed CO_(2) heat pump power generation and energy storage system,this study focuses on obtaining the response characteristics of the whole working stage of system charging,heat pump system start-up,heat pump power generation system switching,and power generation system startup.A quality assessment method for the CO_(2) working fluid is introduced,and the dynamic distribution and capacity migration of CO_(2) within pressure vessels,heat exchange components,and pipelines are analyzed throughout each operational stage.The results show that the flash tank and evaporator account for 61.2%of the total CO_(2) capacity during the start-up preparation stage of the heat pump system.With the operation of the heat pump system,the liquid CO_(2) in the flash tank moves out,leading to increased capacity in the evaporator and cooler.The capacity distribution in the flash tank is mainly affected by pressure,while the capacity growth of the cooler mainly depends on operating temperature.During the switching and power generation system operation stages,the buffer tube facilitates major capacity migration,which increases by 4600.6 kg when the switching is completed and decreases by 1863.6 kg during operation.
作者
李力耕
陈煜
龚箭
王永川
尹名环
王剑锋
Li Ligeng;Chen Yu;Gong Jian;Wang Yongchuan;Yin Minghuan;Wang Jianfeng(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;China Machinery International Engineering Design and Research Institute Co.,Ltd.,Changsha 410021,China)
出处
《天津大学学报(自然科学与工程技术版)》
北大核心
2025年第9期931-939,共9页
Journal of Tianjin University:Science and Technology
基金
国家资助博士后研究人员计划(GZC20241198).
关键词
储能
动态调控
热泵储电
CO_(2)
工质迁移
energy storage
dynamic control
heat pump electricity storage
CO_(2)
working fluid migration
