Patent EP-1595061-A1 (EP)
Inventor: KJER SVEN R
IPC: F01K7/40
Filed: 2004-02-03
Abstract: A steam turbine system comprises a system power output shaft (20), and an electrical generator (12) connected to said system power output shaft for the generation of electrical energy. The system further includes a high-pressure boiler (22) for the generation of steam at a high-pressure and a high temperature, and a high-pressure steam conduit (24) connected to said high-pressure boiler. A high-pressure steam turbine (26) is connected to said high-pressure steam conduit for receiving steam from said high-pressure steam conduit and having a first turbine output shaft connected to said system power output shaft optionally through a first gear assembly, a bleed output (A) and a first steam output conduit (30) for the output of steam at a reduced pressure and temperature as compared to said high-pressure steam. An intermediate pressure steam turbine (28) is connected to said first steam output conduit and having a second turbine output shaft connected to said system power output shaft optionally through a second gear assembly and a second steam output conduit for the output of steam at a further reduced pressure and temperature as compared to steam output from said high-pressure steam turbine. A first low-pressure steam turbine (36) is connected to said second steam output conduit and having a third turbine output shaft connected to said system power output shaft optionally through a third gear assembly and a third pressure output conduit for the output of steam at a still further reduced pressure and temperature as compared to steam output from said intermediate pressure turbine. A first heat exchanger or first re-heater (32) is interconnected between said high-pressure steam turbine (26) and said intermediate pressure steam turbine (28) or alternatively between said intermediate pressure steam turbine (28) and said first low-pressure steam turbine (36) for heating steam received by said intermediate steam turbine or alternatively received by said first low-pressure steam turbine from said first steam output conduit (30) of said high-pressure steam turbine (26) or alternatively said second steam output conduit of said intermediate pressure steam turbine (28) and receiving energy from said boiler. A steam regenerative heater system (76,72) is connected to said bleed output (A) of said high-pressure steam turbine (26) for the return of steam from said high-pressure steam turbine to said high-pressure boiler. A tuning turbine (50) is connected to said first steam output conduit (30) of said high-pressure steam turbine (26) and having a fourth turbine output shaft connected to said system power output shaft optionally through a fourth gear assembly or alternatively connected to a further electrical generator for the generation of electrical energy, and a fourth steam output conduit for the output of steam from said tuning turbine at a reduced pressure and temperature as compared to said steam output from said high-pressure turbine to a heat exchanger of said regenerative heater system and further having at least one bleed output connected to said regenerative system. <IMAGE>