Patent ID: 6238180
Filing Date: 2001-05-29
Classification: F01D

Abstract:
A steam turbine, comprising:an outer casing;a rotor passing axially through the casing;a high-pressure turbine section disposed within the casing and supported on the rotor, the high-pressure turbine section defining a high-pressure steam passage having an upstream side and a downstream side;an intermediate-pressure turbine section disposed within the casing and supported on the rotor axially adjacent to the upstream side of the high-pressure steam passage of the high-pressure turbine section;a dummy ring mounted about the rotor and disposed between the high-pressure and intermediate-pressure turbine sections, the dummy ring having a seal portion operable to discourage high-pressure steam from flowing from the high-pressure turbine section into the intermediate-pressure turbine section; anda pipe having a first end fluidly coupled with the seal portion of the dummy ring and an opposite second end fluidly coupled with the high-pressure steam passage at an intermediate point between the upstream and downstream sides thereof, the pipe being arranged to recover steam leaking past the seal portion of the dummy ring toward the intermediate-pressure turbine section and to supply the recovered steam into the high-pressure turbine section for doing work therein.