摘要
随着电力系统发生快速而深刻的变化,提高火电机组灵活性已成为新能源发展的核心问题。以某300 MW热电联产机组为例,设计了两种抽汽-熔盐储热系统,基于热力学第一定律和热力学第二定律分析了两种系统的调峰特性及热力性能。结果表明:当供热负荷为350 MW时,两种抽汽-熔盐系统在储热工况下的最小出力均可降低至132.17 MW,调峰深度由30%上升至56%;在放热工况下,系统2调峰深度较系统1高4.2%,其发电热效率及㶲效率亦优于系统1;由于储热环节存在较大㶲损,在储-放热全过程中,系统1和系统2的发电热效率分别较原始系统下降了9.77%和8.63%。
With the rapid and profound changes in the power system,improving the flexibility of thermal power units has become a core issue in the development of new energy.Taking a 300 MW cogeneration unit as an example,two extraction steam-molten salt heat storage systems were designed.The peak-shaving characteristics and thermal performance of the two systems were analyzed based on the first law of thermodynamics and the second law of thermodynamics.The results show that when the heating load is 350 MW,the minimum output of the two extraction steam-molten salt systems under the heat storage condition can be reduced to 132.17 MW,and the peak-shaving depth increases from 30%to 56%;under the heat release condition,the peak-shaving depth of system 2 is 4.2 percentage points higher than that of system 1,and its power generation thermal efficiency and exergy efficiency are also better than those of system 1;due to the large exergy loss in the heat storage link,during the whole process of storage-heat release,the power generation thermal efficiency of system 1 and system 2 decreased by 9.77%and 8.63%respectively compared with the original system.
作者
许继东
梅隆
曹未未
陈晓峰
田云峰
司派友
宋亚军
XU Ji-dong;MEI Long;CAO Wei-wei;CHEN Xiao-feng;TIAN Yun-feng;SI Pai-you;SONG Ya-jun(State Grid Jibei Electric Power Co.,Ltd.,Research Institute(North China Electric Power Research Institute Co.,Ltd.),Beijing 100045,China;CHN Energy Suzhou Cd-Generation Co.,Ltd.,Suzhou 234000,China)
出处
《节能技术》
2025年第6期488-494,共7页
Energy Conservation Technology
关键词
热电联产
熔盐储热
热力性能
热电解耦
调峰能力
cogeneration unit
molten salt heat storage
thermal performance
thermoelectric-decoupling
peak shaving capability
