College of Power Engineering, North China Electric Power University;China Southern Grid Power Technology Co., Ltd.;Guangdong Energy Conservation&Supervision Center;China Energy Group Guangdong Electric Power Co., Ltd.;
[Objective]To further improve the flexibility of coal-fired power plants, the peak shifting depth is increased.[Methods] In this paper, a 670 MW supercritical primary reheat coal-fired unit is taken as the research object, and athermal system model is established based on Ebsilon 16.4 to simulate the combination of three heat storage schemesand three heat release schemes. The performances of different combination schemes are evaluated by comparing theindexes of peaking depth, heat storage power, efficiency and thermal efficiency. [Results]Under the heat storagecondition, extracting the exhaust steam from the medium-pressure cylinder can significantly reduce the load of the low-pressure cylinder up to 78%.It is necessary to combine with reheat steam to increase the temperature of the molten salt;the electric heating heat storage scheme has the highest heat storage power up to 100.17 MW·h, but the molten saltdosage is larger. In the heat release condition, heating high-pressure feedwater step by step can reduce the amount ofsteam extraction, and the maximum electric load is increased by 7.4%. The analysis of the combined scheme showsthat the scheme of electrically heated heat storage combined with step-by-step heating of feedwater has the optimalperformance, with its whole-process exergy efficiency of 40.71%, thermal efficiency of 42.3%, and peak shifting depthsignificantly better than other schemes. In addition, the working temperature range of molten salt has a significant effecton energy utilization, and the temperature difference control can reduce the energy loss. The electrically heated heatstorage scheme is better than the traditional steam extraction heat storage in terms of energy reuse rate and systemefficiency, and is suitable for scenarios requiring fast response to peak shifting. The strategy of heating the high-pressurefeedwater step by step when releasing the heat can maximize the flexibility of the unit. [Conclusion] The results of thestudy provide a theoretical basis for the design and modification of the coupled molten salt thermal storage system incoal-fired power plants, which is an important reference value for new energy consumption and grid stability improvement.
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Basic Information:
DOI：10.19944/j.eptep.1674-8069.2025.02.007
China Classification Code:TM621
Citation Information:
[1]尹秋钰,李德波,方立军等.燃煤电厂耦合熔盐储热调峰特性模拟研究[J].电力科技与环保,2025,41(02):240-251.DOI:10.19944/j.eptep.1674-8069.2025.02.007.
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