Steam turbine preheating system with a steam generator

Patent metadata

Field	Value
Publication number	US-10337357-B2
Application number	US-201715420776-A
Country	US
Kind code	B2
Filing date	Jan 31, 2017
Priority date	Jan 31, 2017
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

The present application provides a power generation system. The power generation system may include a gas turbine engine, a steam turbine, and a steam turbine preheating system. The steam turbine preheating system may include a steam generator that creates a flow of steam to preheat the steam turbine from an extraction of the gas turbine engine.

First claim

We claim:

1. A power generation system, comprising:
a gas turbine engine;
a steam turbine; and
a steam turbine preheating system;
wherein the steam turbine preheating system comprises a steam generator that creates a flow of steam to preheat the steam turbine from an extraction of the gas turbine engine.

2. The power generation system of claim 1 , wherein the gas turbine engine comprises a turbine casing and wherein the extraction extends from the turbine casing to the steam generator.

3. The power generation system of claim 1 , wherein the extraction comprises an extraction of hot combustion gases.

4. The power generation system of claim 1 , wherein the steam generator comprises a source of feedwater in communication therewith.

5. The power generation system of claim 1 , wherein the steam turbine comprises a steam turbine shell and wherein the flow of steam extends from the steam generator to the steam turbine shell.

6. The power generation system of claim 1 , further comprising a controller in communication with a plurality of sensors.

7. The power generation system of claim 1 , further comprising a heat recovery steam generator.

8. The power generation system of claim 1 , wherein the steam turbine preheating system comprises an attemperation system.

9. The power generation system of claim 8 , wherein the attemperation system comprises a spray system for at least one of a water injection and a steam injection.

10. The power generation system of claim 1 , wherein the steam turbine preheating system comprises an ejector in communication with the steam generator.

11. The power generation system of claim 10 , wherein the ejector is in communication with at least one of an ambient air flow, a filtered air flow, and a compressor air extraction.

12. The power generation system of claim 1 , wherein the steam turbine preheating system comprises a cascading ejector system in communication with the steam generator.

13. The power generation system of claim 12 , wherein the cascading ejector system comprises a first ejector in communication with a compressor of the gas turbine engine and a second ejector in communication with a turbine of the gas turbine engine.

14. The power generation system of claim 1 , wherein the steam turbine preheating system comprises a further extraction from downstream of the gas turbine engine to the steam generator.

15. A method of preheating a steam turbine in a power generation system, comprising:
extracting hot combustion gases from a gas turbine to a steam generator;
flowing feedwater to the steam generator;
exchanging heat between the hot combustion gases and the flow of feedwater to create a flow of steam in the steam generator; and
flowing the steam to the steam turbine to warm a shell of the steam turbine.

16. A combined cycle power generation system, comprising:
a gas turbine engine;
a steam turbine;
a heat recovery steam generator; and
a steam turbine preheating system;
wherein the steam turbine preheating system comprises a steam generator that creates a flow of steam to preheat the steam turbine from an extraction of the gas turbine engine and a flow of feedwater.

17. The combined cycle power generation system of claim 16 , wherein the gas turbine engine comprises a turbine casing and wherein the extraction extends from the turbine casing to the steam generator.

18. The combined cycle power generation system of claim 16 , wherein the extraction comprises an extraction of hot combustion gases.

19. The combined cycle power generation system of claim 16 , wherein the steam turbine comprises a steam turbine shell and wherein the flow of steam extends from the steam generator to the steam turbine shell.

20. The combined cycle power generation system of claim 16 , wherein the steam turbine preheating system comprises a spray system for at least one of a water injection and a steam injection.

Assignees

• Gen Electric

Inventors

• Mathai George Vargese
• Klosinski Joseph Philip
• Ekanayake Sanji
• Scipio Alston Ilford
• Fisher William Theadore

Classifications

• F01D25/10 Primary

  Heating, e.g. warming-up before starting · CPC title

• F02C6/06

  providing compressed gas (F02C6/10 takes precedence) · CPC title

• F05D2220/72

  a steam turbine · CPC title

• Y02E20/16

  Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT] · CPC title

• F02C6/18

  using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants (using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10) · CPC title