| 摘要 |
A solar thermal power system (10) comprises a solar receiver steam generator (12), a thermal energy storage arrangement (14) utilising a thermal energy storage fluid, and a multistage steam turbine (16) for driving an electrical generator (G) to produce electrical power. The solar thermal power system (10) has a first operating mode in which steam is generated by the solar receiver steam generator (12) and is supplied both to the thermal energy storage arrangement (14) to heat the thermal energy storage fluid and to a high pressure turbine inlet (18) of the multistage steam turbine (16) to drive the steam turbine (16). The solar thermal power system (10) also has a second operating mode in which steam is generated by recovering stored thermal energy from the thermal energy storage fluid of the thermal energy storage arrangement (14), the steam generated during the second operating mode having a lower storage discharge pressure and temperature than the steam generated during the first operating mode. The steam at the discharge pressure and temperature is injected into the multistage steam turbine (16) to drive the steam turbine at a location or turbine stage downstream of the high pressure turbine inlet (18) where the storage steam discharge pressure exceeds the pressure present in the turbine stage during the first operational mode and hence increase the mass flow through the turbine compared to the mass flow during the first operational mode, thereby maximising the power output of the steam turbine (16) during the second operating mode. |
