电力科技与环保2025，Vol.41Issue(4)：528-541,14.DOI:10.19944/j.eptep.1674-8069.2025.04.002
熔盐储热用于煤电机组灵活性改造的研究进展
Research progress on molten salt thermal energy storage for flexibility retrofit of tcoal-fired power units
摘要
Abstract
[Objective]Molten salt heat storage for peak load shaving and frequency adjustment is an important means to achieve flexible operation of coal-fired power plant.The coupling of coal-fired power plant with molten salt storage systems determines both the depth of peak load shaving and the load ramping speed,impacting the economic efficiency of coal-fired power plant.[Methods]Summarizing the related research progress in molten salt heat storage for peak load shaving and frequency adjustment is crucial for optimizing the coupling of molten salt systems with coal-fired power plant.[Results](1)The safe operating temperature of molten salt determines the coupling scheme with thermal power units.Both solar salt and HITEC salt can achieve deep peak shaving,but solar salt cannot utilize latent heat of steam;HITEC salt can utilize latent heat of steam but incurs higher exergy losses.(2)The existence of the heat exchanger pinch point means HITEC salt cannot directly heat to the highest operational temperature and requires a mid-temperature tank for flow regulation.(3)The highest safe operating temperature of solar salt is slightly higher than the main steam temperature of subcritical units,allowing direct heating of water and low-parameter steam to main steam/reheat steam for fast ramping speed.However,for supercritical and ultra-supercritical units,the highest safe operating temperature of solar salt is lower than the main steam and reheat steam temperatures.(4)Solar salt requires a significant amount of energy to heat feedwater to main steam/reheat steam due to the large amount of the latent heat,leading to substantial losses.Optimizing the extraction location can reduce these losses and increase the round-trip efficiency of the molten salt system.(5)Current engineering demonstrations show that molten salt energy storage for peak shaving is feasible,achieving deep peak shaving and rapid ramp-up.However,further research is needed to increase the round-trip efficiency of the system.[Conclusion]Molten salt TES effectively enhances operational flexibility,yet salt selection must align with unit parameters(sub/supercritical).Future development should focus on multi-heat source synergy,intelligent control,and low-melting-point salts to improve economics and round-trip efficiency.关键词
熔盐/储热/调峰/火电机组/灵活性运行Key words
molten salt/thermal energy storage/peak shaving/coal-fired power plant/flexible operation分类
能源科技引用本文复制引用
丁天阳,陈辉,张超群,曹传胜,唐畅,姜聪,张扬,陈文,于洁..熔盐储热用于煤电机组灵活性改造的研究进展[J].电力科技与环保,2025,41(4):528-541,14.基金项目
湖北省中央引导地方科技发展项目(2024CSA088) （2024CSA088）
低碳智能燃煤发电与超净排放全国重点实验室开放课题(D2023FK091) （D2023FK091）
