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Scheme design and performance analysis for a 670 MW coal-fired unit coupled with molten salt energy storage system
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Zhu ZHANG1, Guoqing CHEN2, Xiaoming ZHOU1, Yanni JIANG1
Thermal Power Generation | 2024, 53(3) : 89 - 98
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Thermal Power Generation | 2024, 53(3): 89-98
• Thermal energy science research •
Scheme design and performance analysis for a 670 MW coal-fired unit coupled with molten salt energy storage system
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Zhu ZHANG1, Guoqing CHEN2, Xiaoming ZHOU1, Yanni JIANG1
Affiliations
  • 1.College of Mechanical and Electrical Engineering, Hohai University, Nanjing 210024, China
  • 2.State Key Laboratory of Clean and Efficient Coal fired Power Generation and Pollution Control of National Energy Group Science and Technology Research Institute Co., Ltd., Nanjing 210046, China
Published: 2024-03-25 doi: 10.19666/j.rlfd.202307141
Outline
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To address the challenges posed by the reverse peak shaving characteristics of new energy generation units to the smooth operation of the power grid, coal-fired units urgently need to improve their flexible operation and deep peak shaving capabilities. This article proposes three schemes of molten salt heat storage and heat release for a 670 MW reheating unit, including using a steam ejector to allocate the steam inlet flow rate of the reheater. By using Ebsilon to establish the thermal model, this article analyzes the performance of the coupled system. The results show that all schemes can effectively expand the peak shaving range of the unit. Under energy-storage conditions, the thermal economy of steam-extraction is better than using electrical heating at the same peak shaving depth. The heat-storage scheme of integrating steam ejector to allocate extraction steam to compensate for reheat inlet flow can effectively solve the problem of reheater over temperature caused by a large amount of extracted main steam. Under heat-release conditions, using molten salt to heat high pressure feed water can acquire better thermal and economic benefits. In the combination scheme of heat storage and release, C1-S2 exhibits the best economic performance, with an upward peak shaving depth of 76.89 MW, and a cyclic thermal efficiency and thermal efficiency of 42.48% and 41.31%, respectively.

molten salt energy storage  /  thermal power unit renovation  /  deep peak shaving  /  flexible operation
Zhu ZHANG, Guoqing CHEN, Xiaoming ZHOU, Yanni JIANG. Scheme design and performance analysis for a 670 MW coal-fired unit coupled with molten salt energy storage system[J]. Thermal Power Generation, 2024 , 53 (3) : 89 -98 . DOI: 10.19666/j.rlfd.202307141
Funding
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  • General Program of the National Natural Science Foundation of China(51976080)
  • Technical Innovation Project of Clean and Efficient Coal Fired Power Generation and Pollution Control State Key Laboratory(D2022fk096)
  • Science and Technology Plan Project of Jiangsu Special Equipment Safety Supervision and Inspection Research Institute(KJ(Y)202409)
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Year 2024 volume 53 Issue 3
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Article Info
doi: 10.19666/j.rlfd.202307141
  • Receive Date：2023-07-27
  • Online Date：2025-12-31
  • Published：2024-03-25
Article Data
Affiliations
History
  • Received：2023-07-27
Funding
General Program of the National Natural Science Foundation of China(51976080)
Technical Innovation Project of Clean and Efficient Coal Fired Power Generation and Pollution Control State Key Laboratory(D2022fk096)
Science and Technology Plan Project of Jiangsu Special Equipment Safety Supervision and Inspection Research Institute(KJ(Y)202409)
Affiliations
    1.College of Mechanical and Electrical Engineering, Hohai University, Nanjing 210024, China
    2.State Key Laboratory of Clean and Efficient Coal fired Power Generation and Pollution Control of National Energy Group Science and Technology Research Institute Co., Ltd., Nanjing 210046, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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