Steam power plant having a multi-stage steam turbine

Abstract

A steam power plant includes a multi-stage steam turbine including a rotor and a flow duct formed from a plurality of stages, a boiler, and a first cooling medium supply. The first cooling medium supply opens out into the flow duct of the steam turbine downstream of an intermediate stage. The rotor comprises a first component and a second component. The second component is arranged downstream of the first component as viewed in the flow direction. The intermediate stage is arranged downstream of the first component.

1 . A steam power plant, comprising:
 a multi-stage steam turbine including a rotor and flow duct formed from a plurality of stages;   a boiler; and   a first cooling medium supply,   wherein the first cooling medium supply opens out into the flow duct of the steam turbine downstream of an intermediate stage,   wherein the rotor comprises a first component and a second component,   wherein the second component is arranged downstream of the first component as viewed in the flow direction, and   wherein the intermediate stage is arranged downstream of the first component.   
     
     
         2 . The steam power plant as claimed in  claim 1 , wherein the first cooling medium supply is flow-connected to the flow duct and to a water reservoir. 
     
     
         3 . The steam power plant as claimed in  claim 1 , wherein the first cooling medium supply is flow-connected to a first bypass line from a fresh steam supply line and is flow-connected to the water reservoir. 
     
     
         4 . The steam power plant as claimed in  claim 1 ,
 wherein the steam turbine includes a steam tap pipe which is provided as a tap under a load operation, and   wherein the steam tap pipe is provided as a first cooling medium supply in an idle operation or in a low-load operation.   
     
     
         5 . The steam power plant as claimed in  claim 1 , wherein the steam turbine includes a second stage which is flow-connected to a second cooling medium supply. 
     
     
         6 . The steam power plant as claimed in  claim 5 , wherein the second cooling medium supply is flow-connected to the boiler and to a water reservoir. 
     
     
         7 . The steam power plant as claimed in  claim 5 , wherein the second cooling medium supply is flow-connected to a second bypass line from the fresh steam supply line and is flow-connected to a water reservoir. 
     
     
         8 . The steam power plant as claimed in  claim 1 , wherein the first cooling medium supply and/or the second cooling medium supply open(s) out into a duct which is arranged in a guide blade. 
     
     
         9 . The steam power plant as claimed in  claim 1 , wherein the flow duct is formed between the rotor and an inner housing. 
     
     
         10 . The steam power plant as claimed in  claim 9 , wherein the first cooling medium supply opens into the flow duct through the inner housing. 
     
     
         11 . The steam power plant as claimed in  claim 1 , wherein the first cooling medium supply opens out into the flow duct of the steam turbine downstream of and adjacent to the intermediate stage. 
     
     
         12 . The steam power plant as claimed in  claim 5 , wherein the first cooling medium supply conducts a first cooling medium and the second cooling medium supply conducts a second cooling medium, wherein a first plurality of thermodynamic values of the first cooling medium differ from a second plurality of thermodynamic values of the second cooling medium.