Patent ID: 6109037
Filing Date: 2000-08-29
Classification: F04F,F22D,G21D,Y02E

Abstract:
A feed water heating system for heating a feed water for a power-generating plant having a steam turbine, a condenser and a steam generator, said feed water heating system comprising:a steam injector unit for receiving a plurality of bled steams having different pressures extracted from said steam turbine and an effluent water discharged from said condenser to mix said effluent water with said plurality of bled steams to raise the temperature and pressure of a mixture of said effluent water with said plurality of bled steams to deaerate and discharge the temperature and pressure raised mixture,said steam injector unit comprising:a multistage steam injector having a plurality of steam injectors connected in series for receiving one of said plurality of bled steams and a feed water to mix said one of said plurality of bled steams with said feed water to raise the temperature and pressure of a mixture of said one of said plurality of bled steams and said feed water to discharge the temperature and pressure raised mixture;a container for housing therein said multistage steam injector; anda jet centrifugal deaerator, provided downstream of said multistage steam injector, for receiving a feed water discharged from said multistage steam injector and said bled steams to apply a centrifugal force to said feed water and said bled steams to deaerate said feed water to spatially separate a deaerated feed water from said bled steams to discharge said deaerated feed water.