STUDY ON FLEXIBILITY OF COAL-FIRED UNITS BASED ON MOLTEN SALT THERMAL ENERGY STORAGE SYSTEM

Lyu Shengnan; Lu Yuanwei; Cui Yaru; Ma Yancheng; Wu Yuting; Zhang Cancan

doi:10.19912/j.0254-0096.tynxb.2024-1168

PDF(1557 KB)

Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (11) : 55-60. DOI: 10.19912/j.0254-0096.tynxb.2024-1168

STUDY ON FLEXIBILITY OF COAL-FIRED UNITS BASED ON MOLTEN SALT THERMAL ENERGY STORAGE SYSTEM

Lyu Shengnan, Lu Yuanwei, Cui Yaru, Ma Yancheng, Wu Yuting, Zhang Cancan

Author information +

History +

Abstract

Taking a 600 MW subcritical coal-fired unit as the research object, a new three-tank molten salt thermal energy storage system is proposed, and the effects of molten salt temperature （Th） in the hot tank and molten salt mass flow （Gs） during discharging on the peak shaving performance of the coal-fired unit are studied. The results show that the increase of Th can prolong the charging time and increase the generating power of the unit during the discharging process, but it will reduce the exergy efficiency during charging. With an increase in Gs, the increment of power generation in the discharging process decreases. For the complete peak-shaving process, the lower the Th and the smaller the Gs, the better the comprehensive peak-shaving performance of coal-fired units.

Key words

coal-fired power plant / molten salt / thermal energy storage / main steam / three-tank

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

Lyu Shengnan, Lu Yuanwei, Cui Yaru, Ma Yancheng, Wu Yuting, Zhang Cancan. STUDY ON FLEXIBILITY OF COAL-FIRED UNITS BASED ON MOLTEN SALT THERMAL ENERGY STORAGE SYSTEM[J]. Acta Energiae Solaris Sinica. 2025, 46(11): 55-60 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1168

References

[1] INTERNATIONAL ENERGY AGENCY. The global power mix is set to transform by2030[EB/OL]. https://www.iea.org/energy-system/renewables.
[2] 郭朝先. 2060年碳中和引致中国经济系统根本性变革[J]. 北京工业大学学报(社会科学版), 2021, 21(5): 64-77.
GUO C X.Carbon neutrality by 2060 leads to fundamental changes in China’s economic system[J]. Journal of Beijing University of Technology(social sciences edition), 2021, 21(5): 64-77.
[3] 魏海姣, 鹿院卫, 刘金恺, 等. 基于储热的燃煤机组深度调峰规模化消纳可再生能源发电研究[J]. 热力发电, 2023, 52(2): 79-89.
WEI H J, LU Y W, LIU J K, et al.Research on large-scale renewable energy power consumption by peak shaving system of coal-fired power unit integrated with thermal energy storage[J]. Thermal power generation, 2023, 52(2): 79-89.
[4] 周璐璐, 王军, 邴旖旎, 等. 太阳能辅助的燃煤机组经济性分析[J]. 太阳能学报, 2021, 42(10): 105-110.
ZHOU L L, WANG J, BING Y N, et al.Economic analysis of solar energy aided coal-fired power system[J]. Acta energiae solaris sinica, 2021, 42(10): 105-110.
[5] OUYANG T C, QIN P J, XIE S T, et al.Flexible dispatch strategy of purchasing-selling electricity for coal-fired power plant based on compressed air energy storage[J]. Energy, 2023, 267: 126578.
[6] CAO R F, LU Y, YU D R, et al.A novel approach to improving load flexibility of coal-fired power plant by integrating high temperature thermal energy storage through additional thermodynamic cycle[J]. Applied thermal engineering, 2020, 173: 115225.
[7] KRÜGER M, MUSLUBAS S, LOEPER T, et al. Potentials of thermal energy storage integrated into steam power plants[J]. Energies, 2020, 13(9): 2226.
[8] LAI F, WANG S, LIU M, et al.Operation optimization on the large-scale CHP station composed of multiple CHP units and a thermocline heat storage tank[J]. Energy conversion and management, 2020, 211: 112767.
[9] ZHANG K Z, LIU M, ZHAO Y L, et al.Design and performance evaluation of a new thermal energy storage system integrated within a coal-fired power plant[J]. Journal of energy storage, 2022, 50: 104335.
[10] ARGYROU M C, CHRISTODOULIDES P, KALOGIROU S A.Energy storage for electricity generation and related processes: technologies appraisal and grid scale applications[J]. Renewable and sustainable energy reviews, 2018, 94: 804-821.
[11] 陈泽泓, 糜又晚, 杜广瀚, 等. 太阳能热发电熔盐槽式集热回路流量分配特性研究[J]. 太阳能学报, 2023, 44(3): 516-524.
CHEN Z H, MI Y W, DU G H, et al.Flow distribution performance research on solar field of molten salt parabolic trough solar power plants[J]. Acta energiae solaris sinica, 2023, 44(3): 516-524.
[12] 韩伟, 崔凯平, 刘欣, 等. 太阳能热发电站熔盐储罐首次充盐策略研究[J]. 太阳能学报, 2022, 43(3): 282-287.
HAN W, CUI K P, LIU X, et al.Research on first salt filling strategy for storage tanks of csp plant[J]. Acta energiae solaris sinica, 2022, 43(3): 282-287.
[13] WANG B G, MA H, REN S J, et al.Effects of integration mode of the molten salt heat storage system and its hot storage temperature on the flexibility of a subcritical coal-fired power plant[J]. Journal of energy storage, 2023, 58: 106410.
[14] WEI H J, LU Y W, YANG Y C, et al.Research on influence of steam extraction parameters and operation load on operational flexibility of coal-fired power plant[J]. Applied thermal engineering, 2021, 195: 117226.
[15] WEI H J, LU Y W, YANG Y C, et al.Flexible operation mode of coal-fired power unit coupling with heat storage of extracted reheat steam[J]. Journal of thermal science, 2022, 31(2): 436-447.
[16] ZHANG K Z, LIU M, ZHAO Y L, et al.Thermo-economic optimization of the thermal energy storage system extracting heat from the reheat steam for coal-fired power plants[J]. Applied thermal engineering, 2022, 215: 119008.