储能科学与技术2025，Vol.14Issue(4)：1461-1470,10.DOI:10.19799/j.cnki.2095-4239.2024.0996
耦合火电厂灵活改造的卡诺电池储能系统热力学性能研究
Thermodynamic performance of a flexible retrofit Carnot battery energy storage system in a coupled thermal power plant
摘要
Abstract
The integration of energy storage technology with thermal power plant retrofitting enables stable grid connection of renewable energy and flexible peak shaving of coal-fired units.This study proposes a molten salt Carnot battery energy storage system integrated with a thermal power plant to enhance peak-shaving flexibility.Using a typical 600 MW subcritical coal-fired power plant as a reference,a coupled system model—including the coal-fired power plant,a heat pump thermal energy storage unit,and a steam thermal energy storage unit—is developed using Aspen Plus.The study analyzes the efficiency,peak-shaving capacity,and depth of three thermal energy storage modes-steam thermal energy storage(STES),steam combined with heat pump thermal energy storage(SHPTES),and heat pump thermal energy storage(HPTES)across different operational stages.Additionally,the efficiency and peak-shaving performance of the coupled system under various energy storage and release loads and schemes are evaluated.The results indicate that the STES approach achieves higher coupled system efficiencies when the coal-fired power plant operates at low loads.In contrast,HPTES demonstrates superior peak-shaving performance,with its maximum peak-shaving capacity per unit of heat storage load increasing by 69%compared to STES.The addition of thermal energy storage devices substantially enhances the peak-shaving performance of the coal-fired power plant while causing only a minimal efficiency loss.When operating at a rated load with a heat storage load of 90 MW,the SHPTES approach increases the peak-shaving capacity and depth by 78.29 MW and 13.04%,respectively,with an efficiency loss of only 0.16%.Furthermore,coupling schemes for STES are examined.During energy storage,reheated steam is extracted and returned to the deaerator after heat release.In the energy release process,a portion of the feedwater is heated and directed to the boiler via a bypass.This coupling scheme effectively balances heat storage capacity,peak-shaving capacity and depth,and system efficiency.This study provides valuable guidance for retrofitting coal-fired power plants with molten salt Carnot batteries to improve operational flexibility.关键词
卡诺电池/火电厂灵活性改造/熔盐储热/调峰Key words
Carnot battery/thermal power plant retrofitting/molten salt thermal storage/peak shaving分类
化学工程引用本文复制引用
于博旭,韩瑞,刘倩,廖志荣,巨星,徐超..耦合火电厂灵活改造的卡诺电池储能系统热力学性能研究[J].储能科学与技术,2025,14(4):1461-1470,10.基金项目
国家重点研发计划项目(2023YFB2406500),国家自然科学基金项目(52376181). （2023YFB2406500）
