热能储存
火力发电站
工艺工程
火用
发电站
储能
可再生能源
环境科学
工程类
热效率
废物管理
核工程
功率(物理)
燃烧
电气工程
化学
热力学
物理
有机化学
作者
Kezhen Zhang,Ming Liu,Yongliang Zhao,Hui Yan,Junjie Yan
标识
DOI:10.1016/j.est.2022.104335
摘要
Thermal power plants are required to enhance operational flexibility to ensure the power grid stability with the increasing share of intermittent renewable power. Integrating thermal energy storage is a potential solution. This work proposes a novel system of molten salt thermal storage based on multiple heat sources (i.e., high-temperature flue gas and superheated steam) integrated within a coal-fired power plant. To evaluate the performance of the thermal energy storage system, simulation models were established, and exergy analysis was conducted. Results show that the integration of molten salt thermal storage achieves the synergistic improvement of operational flexibility and thermal efficiency of the thermal power system. When the boiler keeps steady combustion, the minimum power load decreases from 30% to 14.51% of the rated load during the charging process because of the integration of the thermal energy storage system. To decrease the power load of the coal-fired power plant, the surplus heat is stored in the thermal storage system to be used later. The equivalent round-trip efficiency of the thermal energy storage system is up to 85.17%, which is achieved by the appropriate match between the heat sources and the thermal storage media.
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