APPLICATION ANALYSIS OF DEEP PEAK SHAVING OF LOW-PRESSURE CYLINDER ZERO-OUTPUT UNIT ASSISTED BY MOLTEN SALT HEAT STORAGE

Zhang Wanying; Jin Jing; Xie Xiaojun; Gao Xinyong; Lan Junjie; Liang Guowei

doi:10.19912/j.0254-0096.tynxb.2023-1504

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (1) : 279-287. DOI: 10.19912/j.0254-0096.tynxb.2023-1504

APPLICATION ANALYSIS OF DEEP PEAK SHAVING OF LOW-PRESSURE CYLINDER ZERO-OUTPUT UNIT ASSISTED BY MOLTEN SALT HEAT STORAGE

Zhang Wanying¹, Jin Jing¹, Xie Xiaojun², Gao Xinyong³, Lan Junjie², Liang Guowei¹

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Abstract

A capacity optimization model and feasibility evaluation model are established to assess the deep peak shaving of low-pressure cylinder zero-output units with molten salt thermal storage in the electricity spot market. The analysis is conducted using a 350 MW thermal power unit in Shanxi Province, which undergoes a zero-output modification in the low-pressure cylinder. The results show that the optimal capacity for the unit to be equipped with a molten salt thermal storage system is 471.16 MWh, with a static investment payback period of 2.3 years. The installation of the thermal storage system reduces the unit's electricity sales revenue but lowers coal consumption costs and increases peak shaving revenue, leading to a net profit increase of 31.67 million yuan compared to the non-configured molten salt thermal storage option. With the configuration of molten salt thermal storage, the operational flexibility of the unit significantly improves. The duration of peak shaving in the first and second price tiers of the electricity spot market increases, with the overall peak shaving duration rising from 56.4% to 85.6%. Additionally, an increase in coal prices and heating area negatively impacts the net profit and investment payback period of the transformation project.

Key words

CHP plant / energy storage / molten salt / depth peak regulation / capacity allocation / flexibility

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Zhang Wanying, Jin Jing, Xie Xiaojun, Gao Xinyong, Lan Junjie, Liang Guowei. APPLICATION ANALYSIS OF DEEP PEAK SHAVING OF LOW-PRESSURE CYLINDER ZERO-OUTPUT UNIT ASSISTED BY MOLTEN SALT HEAT STORAGE[J]. Acta Energiae Solaris Sinica. 2025, 46(1): 279-287 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1504

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