Patent ID: 8857187

Claim:
A steam turbine plant comprising: a solar energy collector configured to collect solar heat; a boiler; a steam as a working fluid, the boiler configured to change water into the steam using the solar heat; a high pressure turbine including a turbine or turbines connected to each other in series, and configured to be driven by the steam from the boiler; first to N-th reheaters, where N is an integer of two or more; and first to N-th reheat turbines, wherein the first reheater is configured to heat the steam exhausted from the high pressure turbine using the solar heat, and the first reheat turbine is configured to be driven by the steam from the first reheater, a second to the N-th reheaters are configured to heat the steam exhausted from the first to (N−1)-th reheat turbines using the solar heat, respectively, and a second to the N-th reheat turbines are configured to be driven by the steam from the second to the N-th reheaters, respectively, the steam inside of a reheat turbine other than the N-th reheat turbine among the first to N-th reheat turbines is maintained as dry steam, the steam inside the N-th reheat turbine is changed from dry steam to humid steam, and the steam inside the high pressure turbine is maintained as dry steam.