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[Objective] To enhance the flexibility and energy efficiency of coal-fired units in high-renewable power grids, this study investigates a 1 050 MW ultra-supercritical unit coupled with a molten salt thermal energy storage system. [Methods] A system model covering both charging and discharging phases is established to analyze the effects of different steam extraction and feedwater heating configurations on thermal performance,aiming to identify an optimal energy storage and release strategy. [Results] Results show that mixing main steam exhaust into the boiler feedwater yields the highest cycle efficiency of 50.1%, while returning reheated steam exhaust to the fifth low-pressure heater outlet offers the best economy. The optimal discharging scheme—returning feedwater from the pump outlet to the high-pressure turbine inlet-achieves a peak-shaving capacity of 26.3 MW, cycle efficiency of 50.54%, and coal consumption rate of 253.17 g/kWh. [Conclusion] This study provides a feasible technical path and theoretical reference for flexibility retrofits of coal-fired units.
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Basic Information:
DOI：10.11857/j.issn.1674-5124.2025080029
China Classification Code:TM621
Citation Information:
[1]HAN Xu,CAO Yi,ZHANG Jie.Performance analysis of variable-load operation for coal-fired power units assisted by molten salt thermal energy storage[J].China Measurement & Test,2026,52(09):19-25.DOI:10.11857/j.issn.1674-5124.2025080029.
Fund Information:
河北省自然科学基金项目(E2023502025); 河北省高等学校科学研究项目青年拔尖项目(BJ2025053)
2025-08-08
2025
2025-10-11
2026-09-24
2026-09-24