Study on peaking performance and thermal economy of thermal power unit coupled with molten salt thermal storage system
With the rapid advancement of renewable energy power generation,thermal power units need to take on major peaking tasks.Molten salt thermal storage technology,as a prominent method for thermal power peaking,can effectively improve peaking performance of the units.The Ebsilon software is employed to model a subcritical 300 MW unit integrated with coupled molten salt thermal storage system.Considering the operational conditions of supplying industrial steam to external entities,several indexes such as the storage/exothermic thermal efficiency,load variation and thermoelectric conversion rate of three heat storage/exothermic schemes are investigated comparatively.The results indicates that,during the heat storage process,the heat storage scheme 3(the heat source for heat storage is the main steam,reheat steam and medium-pressure cylinder exhaust,and the exothermic medium-pressure cylinder exhaust goes directly to the condenser)exhibits the highest load variation,reaching up to 102.63 MW.Meanwhile,the heat storage scheme 1(employing main steam and reheat steam as the heat source for storage)demonstrates the superior thermal efficiency at 28.76%.During the discharge process,exothermic scheme 2(heat from high-temperature molten salt is used to supply industrial steam and preheat condensate)has the largest load variation,release thermal efficiency,and thermoelectricity conversion rate,which are 34.69 MW,46.14%,and 59.07%,respectively.This study can provide theoretical guidance for the study of peak performance and thermal economy of thermal power units coupled with molten salt thermal storage system.
coal-fired unitmolten salt heat storagethermal efficiencyamount of load changethermal economy
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