Feed water heating system for power-generating plant

A feed water heating system for heating a feed water a power-generating plant having a steam turbine, a condenser and a steam generator, said feed water heating system comprising:

• a steam injector system 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 system comprising:
• a cylindrical casing;
• a plurality of steam injector units provided in said casing in parallel to each other;
• and
• a bled steam supply line, provided in said casing, for supplying a plurality of bled steams having different pressures extracted from said steam turbine to each of said plurality of steam injector units,
• each of said steam injector units 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 cylindrical container for housing therein said multistage steam injector;
• and
• a 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.

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 plurality of steam injector systems, arranged in series, 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,
• each of said steam injector systems comprising:
• a cylindrical casing;
• a plurality of steam injector units provided in said casing in parallel to each other;
• and
• a bled steam supply line, provided in said casing, for supplying a plurality of bled steams having different pressures extracted from said steam turbine to each of said plurality of steam injector units,
• each of said steam injector unit receiving said plurality of bled steams from said bled steam supply line 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,
• each of said steam injector units 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 cylindrical container for housing therein said multistage steam injector;
• and
• a 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.