Thermal energy storage system and method with heat recovery steam generator

A heat recovery steam generator (HRSG) with thermal energy storage system comprising:

• a housing having an inlet configured to receive exhaust gas from a fired turbine, the housing configured to have an outlet and an internal gas exhaust flow path between the inlet and outlet;
• superheater coils of heat exchanger tubes, the superheater coils located within the housing internal exhaust flow path downstream from the inlet;
• a high pressure evaporator comprising coils located within the housing internal exhaust flow path downstream from the housing inlet and superheater coils;
• additional downstream coils of heat exchanger tubes, the said additional downstream coils located within the housing downstream of the high pressure evaporator coils, so that gas coming from the housing inlet can flow downstream through the superheater coils, through the high pressure evaporator coils and through the downstream coils towards the housing outlet;
• a steam/media heat exchanger configured to receive steam from the heat recovery steam generator and to receive a flow of heat storage media, the steam/media heat exchanger being configured to transfer heat from the steam to the heat storage media and heat the heat storage media;
• a storage hot tank in fluid communication with the steam/media heat exchanger, the storage hot tank being configured to receive the heated heat storage media from the steam/media heat exchanger and store the heated heat storage media;
• a water/media heat exchanger configured to receive a flow of water and to receive the heated heat storage media stored in the hot tank from the hot tank, the water/media heat exchanger being configured to transfer heat from the heated heat storage media to the water to produce steam and deliver the steam to the heat recovery steam generator;
• the heat recovery steam generator comprises a superheater and a desuperheater, and wherein the steam/media heat exchanger that receives steam from the heat recovery steam generator is adapted and configured to cool steam generated by the heat recovery steam generator in a manner that replaces or reduces operation of the desuperheater of the heat recovery steam generator.