# US 2014/0150431 A1 · Steam power plant having a multi-stage steam turbine

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- Number: US 2014/0150431 A1
- Document ID: US20140150431A1
- Status: Published application
- Kind: A1
- Application number: 14/176,419
- Filed: 2014-02-10
- Published: 2014-06-05
- Earliest claimed: 2009-08-24
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Stefan Glos; Matthias Heue; Ernst-Wilhelm Pfitzinger; Norbert Pieper
- Web page: https://patentgrep.com/patent/US20140150431A1

## CPC

- F01K 13/02: Controlling, e.g. stopping or starting
- F01D 5/28: Selecting particular materials; {Particular measures relating thereto;} Measures against erosion or corrosion
- F01D 25/12: Cooling
- F01D 25/14: Casings modified therefor (double casings F01D25/26)
- F01D 25/26: Double casings; Measures against temperature strain in casings
- F01K 7/16: the engines being only of turbine type (the engines using steam of critical or overcritical pressure F01K7/32; the engines being of extraction or non-condensing type F01K7/34)
- F01K 13/006: {Auxiliaries or details not otherwise provided for}
- F01K 13/025: {Cooling the interior by injection during idling or stand-by}
- F05D 2220/31: in steam turbines
- F05D 2260/232: characterized by the cooling medium
- F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 5)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

The steam power plant as claimed in claim 1, wherein the flow duct is formed between the rotor and an inner housing.

### Claim 10 (depends on 9)

The steam power plant as claimed in claim 9, wherein the first cooling medium supply opens into the flow duct through the inner housing.

### Claim 11 (depends on 1)

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.

### Claim 12 (depends on 5)

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.