Patent ID: 8695347

Claim:
A power plant having a steam generation apparatus for generating steam comprising: a main steam system having a main steam pipe for introducing steam connected to the steam generation apparatus, and a first turbine and a second turbine having a lower pressure than the first turbine to which turbines, the steam is sequentially supplied through the main steam pipe; a condenser for condensing the steam discharged from the second turbine; a feed water pipe for introducing feed water generated by condensing the steam in the condenser to the steam generation apparatus; a plurality of feed water heaters provided on the feed water pipe; a steam compression apparatus for compressing the steam; a first pipe, not provided with the steam compression apparatus, for introducing the steam extracted from a first position of the main steam system to one of the feed water heaters; and a second pipe, provided with the steam compression apparatus, for connecting a second position of the main steam system located downstream of the first position to a feed water heater that is directly connected with the first pipe, wherein, the second pipe is directly connected to the feed water heater that is directly connected to the first pipe; and when power required by the steam compression apparatus for compressing the steam is Q 1 , a heat quantity supplied to one of the feed water heaters by the steam compressed by the steam compression apparatus is Q 3 , a coefficient of performance of the steam compression apparatus, defined as Q 3 /Q 1 , is COP, and thermal efficiency of the power plant supplying the power Q 1 to the steam compression apparatus is η, the second pipe provided with the steam compression apparatus is connected to the second position and one of the feed water heaters so as to satisfy COP−1/η>0.