Patent ID: 9726041
Date: 2017-08-08
CPC Classifications: F01D,F05D

Claim:
1. A steam turbine, comprising: a rotatably mounted rotor on which there is a first blading region and a second blading region, each blading region comprising a plurality of rotor blades, wherein the first blading region is arranged in a high pressure flow duct and the second blading region is arranged in a second flow duct; an inner casing arranged around the rotor; wherein the high-pressure flow duct is arranged between the rotor and the inner casing; wherein the rotor comprises a dummy piston prechamber and a dummy piston, wherein the steam turbine has a dummy piston line directly connected to a source of superheated steam, wherein the dummy piston line opens into the dummy piston prechamber such that superheated steam flows into the dummy piston prechamber and substantially fills the dummy piston prechamber with superheated steam, wherein the steam turbine has a wet steam line, which establishes a direct fluidic connection between a gap space arranged between the rotor and inner casing and a first pressure space disposed in the second blading region, wherein a pressure in the gap space is higher than in the first pressure space such that wet steam flows from the gap space to the first pressure space, thereby substantially preventing flow of wet steam into the dummy piston prechamber, and wherein the gap space is further arranged between the dummy piston prechamber and a high-pressure outflow zone of the high-pressure flow duct; and wherein the first pressure space is disposed between adjacent rotor blades in the second blading region.