Power plant including an ejector and steam generating system via turbine extraction and compressor extraction

Patent metadata

Field	Value
Publication number	US-9970354-B2
Application number	US-201514969098-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 15, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A power plant includes a compressor, a combustor downstream from the compressor and a turbine disposed downstream from the combustor. The compressor includes a compressor extraction port. The turbine includes a turbine extraction port that is in fluid communication with a hot gas path of the turbine and which provides a flow path for a stream of combustion gas to flow out of the turbine. An exhaust duct is disposed downstream from the turbine and receives exhaust gas from the turbine. An ejector coupled to the turbine extraction port and to the compressor extraction port cools the stream of combustion gas upstream from the exhaust duct. The cooled combustion gas flows into the exhaust duct at a higher temperature than the exhaust gas and mixes with the exhaust gas within the exhaust duct to provide a heated exhaust gas mixture to a heat exchanger downstream from the exhaust duct.

First claim

What is claimed:

1. A power plant, comprising:
a compressor, a combustor downstream from the compressor and a turbine disposed downstream from the combustor, the compressor including a compressor extraction port disposed between an upstream end and a downstream end of the compressor, the turbine including a turbine extraction port in fluid communication with a hot gas path of the turbine, wherein the turbine extraction port provides a flow path for a stream of combustion gas to flow out of the turbine;
an exhaust duct downstream from an outlet of the turbine, wherein the exhaust duct receives exhaust gas from the turbine outlet; and
an ejector having a primary inlet fluidly coupled to the turbine extraction port, a second inlet fluidly coupled to the compressor extraction port and an outlet in fluid communication with the exhaust duct;
wherein the ejector cools the stream of combustion gas upstream from the exhaust duct via compressed air extracted from the compressor, wherein the cooled combustion gas is at a higher temperature than the exhaust gas, and wherein the cooled combustion gas mixes with the exhaust gas within the exhaust duct to provide a heated exhaust gas mixture to a heat exchanger disposed downstream from the exhaust duct.

2. The power plant as in claim 1 , wherein the heat exchanger extracts thermal energy from the exhaust gas mixture to produce steam.

3. The power plant as in claim 1 , further comprising a steam turbine disposed downstream from the heat exchanger.

4. The power plant as in claim 1 , wherein the turbine comprises an inner casing, an outer casing and an extraction pipe in fluid communication with at least one turbine stage of the turbine, wherein the extraction pipe is in fluid communication with the turbine extraction port.

5. The power plant as in claim 1 , further comprising a coolant injection system disposed downstream from the ejector outlet and upstream from the exhaust duct, wherein the coolant injection system injects a coolant into the stream of cooled combustion gas flowing from the ejector outlet.

6. The power plant as in claim 5 , wherein the coolant is water.

7. The power plant as in claim 5 , wherein the coolant is steam.

8. The power plant as in claim 1 , further comprising a controller electronically coupled to a first control valve fluidly connected between the turbine extraction port and the ejector inlet and a second control valve disposed upstream from the second inlet of the ejector.

9. The power plant as in claim 8 , further comprising a temperature monitor electronically coupled to the controller and in thermal communication with the turbine extraction port upstream from the exhaust duct, wherein the controller actuates at least one of the first control valve to increase or decrease the stream of combustion gas from the turbine and the second control valve to increase or decrease mass flow through the second inlet of the ejector in response to a data signal provided by the temperature monitor to the controller.

10. The power plant as in claim 8 , further comprising a steam flow monitor disposed downstream from the heat exchanger and electronically coupled to the controller, wherein the controller actuates at least one of the first control valve and the second control valve in response to a flow output signal provided to the controller by the steam flow monitor.

11. A power plant, comprising:
a gas turbine having a compressor, a combustor downstream from the compressor and a turbine downstream from the combustor, the compressor including a compressor extraction port disposed between an upstream end and a downstream end of the compressor, the turbine including a first stage in fluid communication with a first turbine extraction port and a second stage in fluid communication with a second turbine extraction port, wherein the first and second turbine extraction ports provide for extraction of a stream of combustion gas out of the turbine downstream from the combustor;
an exhaust duct downstream from an outlet of the turbine, wherein the exhaust duct receives exhaust gas from the turbine; and
an ejector having a primary inlet fluidly coupled to at least one of the first and second turbine extraction ports, a second inlet fluidly coupled to the compressor extraction port and an outlet fluidly coupled to the exhaust duct;
wherein the ejector cools the stream of combustion gas upstream from the exhaust duct via compressed air extracted from the compressor, wherein the cooled combustion gas is at a higher temperature than the exhaust gas, and wherein the cooled combustion gas mixes with the exhaust gas within the exhaust duct to provide a heated exhaust gas mixture to a heat exchanger disposed downstream from the exhaust duct.

12. The power plant as in claim 11 , wherein the heat exchanger extracts thermal energy from the exhaust gas mixture to produce steam.

13. The power plant as in claim 11 , further comprising a steam turbine disposed downstream from the heat exchanger.

14. The power plant as in claim 11 , further comprising a coolant injection system disposed downstream from the ejector outlet and upstream from the exhaust duct, wherein the coolant injection system injects a coolant into the stream of cooled combustion gas flowing from the ejector outlet.

15. The power plant as in claim 14 , wherein the coolant is water.

16. The power plant as in claim 14 , wherein the coolant is steam.

17. The power plant as in claim 11 , further comprising a controller electronically coupled to a first control valve fluidly connected between the first turbine extraction port and the ejector inlet, a second control valve fluidly connected between the second turbine extraction port and the ejector inlet and a third control valve disposed upstream from the second inlet of the ejector.

18. The power plant as in claim 17 , further comprising a temperature monitor electronically coupled to the controller and disposed downstream from the ejector outlet, wherein the controller actuates at least one of the first and second control valves to increase or decrease the stream of combustion gas from the turbine and actuates the third control valve to increase or decrease mass flow through the second inlet of the ejector in response to a data signal provided to the controller by the temperature monitor.

19. The power plant as in claim 17 , further comprising a flow monitor disposed downstream from the heat exchanger and electronically coupled to the controller, wherein the controller actuates at least one of the first control valve, the second control valve and the third control valve in response to a flow output signal provided by the flow monitor to the controller.

Assignees

• Gen Electric

Inventors

• Klosinski Joseph Philip
• Cocca Michael Anthony
• Scipio Alston Ilford
• Ekanayake Sanji

Classifications

• F02C3/04

  having a turbine driving a compressor (power transmission arrangements F02C7/36; control of working fluid flow F02C9/16) · CPC title

• H02K7/1823

  structurally associated with turbines or similar engines · CPC title

• Y02E20/14

  Combined heat and power generation [CHP] · CPC title

• Y02E20/16

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

• F01D25/305

  with fluid, e.g. liquid injection · CPC title