Patent EP-1445429-A1 (EP)
Inventor: KJAER SVEN R
IPC: F01K7/40
Filed: 2003-02-07
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.