To improve the peak shaving performance and flexibility of a 1000MW thermal power unit,a molten salt heat storage system is introduced into a 1000MWthermal power unit,and a variety of coupled molten salt heat storage system schemes are proposed.Thermodynamic system models of thermal power units are established,and the peak shaving capacity,peak shaving depth and thermal efficiency of the coupling system of thermal power units are analysed under different coupling schemes.An optimal coupled molten salt heat storage system for thermal power units is proposed.The results are as follows:in the heat storage stage,the coupled systems using an electric boiler to heat molten salt has the highest thermal efficiency,and its peak shaving depth can reach 14.45%,which is only0.34%different from the scheme of heating molten salt in the main steam extraction combined electric boiler with the highest peak shaving depth.At the heat release stage,the thermal efficiency of the coupling system decreases successively when the water intake point moves from the deaerator to the No.1 high temperature heater,and the maximum efficiency of the coupling system can reach 45.86%when the water intake point is at the inlet of the No.4 high temperature heater.Under different unit loads,the thermal efficiency of the coupling system in the heat release stage increased with increasing unit loads,and the maximum difference in the thermal efficiency of the coupling system was 4.45%.The unit load had little influence on the thermal efficiency of coupling system.The research results have guiding significance for the peak shaving of coupled molten salt heat storage systems of thermal power units.
thermal power unitmolten salt heat storagepeak regulation depthpeak regulating capacitysystem thermal efficiency
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