Steam turbine plant, combined cycle plant equipped with same, and method of operating steam turbine plant

摘要

Boiler 20, one or more evaporators (22, 26) for heating the introduced water to the heating fluid to a temperature above the constant pressure specific heat maximum temperature where the static pressure specific heat is maximized, and heating the steam from the boiler 20 with the heating fluid Have one or more reheaters 31. All reheaters 31 that supply steam to the low pressure steam turbine 43 are arranged only on the downstream side of the high pressure evaporator 26. All the reheaters 31 contain steam that has passed through the high pressure steam turbine 41 to which steam is supplied from the high pressure evaporator 26, and also the reheating temperature lower than the static pressure specific heat maximum temperature in the high pressure evaporator 26 The molten vapor (FRHS) is heated to below this constant pressure specific heat maximum temperature.