POWER GENERATION SYSTEM EXHAUST COOLING

• US 20160376957A1
• Filed: 06/29/2015
• Published: 12/29/2016
• Est. Priority Date: 06/29/2015
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (General Electric Company)
• Original Assignee: General Electric Company
• Inventors: Kulkarni, Parag Prakash, Davis, Lewis Berkley Jr., Reed, Robert Joseph
• Granted Patent: US 9,850,794 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01D 25/305 with fluid, e.g. liquid injection
• CPC Class Codes: F01N 2270/02 for cooling exhaust gases or the apparatus
• CPC Class Codes: F01N 3/05 by means of air, e.g. by mixing exhaust with air silencers working by addition of air to exhaust F01N1/14; arrangements for the supply of additional air for the thermal or catalytic conversion of noxious components of exhaust F01N3/30 ; in tailpipes F01N13/082
• CPC Class Codes: F01N 3/2066 Selective catalytic reduction [SCR]
• CPC Class Codes: F02C 3/10 with another turbine driving an output shaft but not driving the compressor
• CPC Class Codes: F05D 2220/36 specially adapted for the fan of turbofan engines
• CPC Class Codes: Y02E 20/14 Combined heat and power generation [CHP]
• CPC Class Codes: Y02E 20/16 Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Abstract

A power generation system according to an embodiment includes: a gas turbine system including a compressor component, a combustor component, and a turbine component; an airflow generation system coupled to an expander shaft downstream of the gas turbine system for drawing in a flow of ambient air through an air intake section; a mixing area for receiving an exhaust gas stream produced by the gas turbine system;

• • a flow directing system for directing the flow of ambient air generated by the airflow generation system to the mixing area to reduce a temperature of the exhaust gas stream;
  • and an exhaust processing system for processing the reduced temperature exhaust gas stream.

Claims

1. An airflow control system for a gas turbine system, comprising:

an airflow generation system for attachment to a rotatable expander shaft of a gas turbine system, downstream of the gas turbine system, for drawing in a flow of ambient air through an air intake section;

a mixing area for receiving an exhaust gas stream produced by the gas turbine system; and

a flow directing system for directing the flow of ambient air drawn in by the airflow generation system to the mixing area to reduce a temperature of the exhaust gas stream.

2. The airflow control system of claim 1, wherein the airflow generation system comprises a fan.

3. The airflow control system of claim 2, wherein the fan comprises:

an inner radial stage for passing the exhaust gas stream produced by the gas turbine system to the mixing area; and

an outer radial stage for drawing in the flow of ambient air through the air intake section.

4. The airflow control system of claim 3, further comprising a moving seal on the fan for preventing the exhaust gas stream from entering the air intake section.

5. The airflow control system of claim 3, further comprising an inlet guide vane system for controlling the flow of air through the air intake section to the outer radial stage of the fan.

6. The airflow control system of claim 3, wherein the flow directing system is configured to direct the ambient air drawn in by the outer radial stage of the fan at an angle toward and into the exhaust gas stream.

7. The airflow control system of claim 6, wherein the flow directing system comprises a guide vane system.

8. The airflow control system of claim 1, further comprising a selective catalytic reduction (SCR) system for processing the reduced temperature exhaust gas stream.

9. The airflow control system of claim 1, further comprising a heat recovery steam generator (HRSG) system for processing the reduced temperature exhaust gas stream.

10. The airflow control system of claim 1, wherein the air intake section is coupled to an air intake section of the gas turbine system.

11. A turbomachine system, comprising:

a gas turbine system including a compressor component, a combustor component, and a turbine component;

a fan coupled to an expander shaft of the gas turbine system, downstream of the gas turbine system, for drawing in a flow of ambient air through an air intake section, wherein the fan comprises an inner radial stage for passing the exhaust gas stream produced by the gas turbine system to the mixing area, and an outer radial stage for drawing in the flow of ambient air through the air intake section;

a mixing area for receiving an exhaust gas stream produced by the gas turbine system; and

a flow directing system for directing the flow of ambient air drawn in by the airflow generation system to the mixing area to reduce a temperature of the exhaust gas stream.

12. The turbomachine system of claim 11, further comprising a moving seal on the fan for preventing the exhaust gas stream from entering the air intake section.

13. The turbomachine system of claim 11, further comprising an inlet guide vane system for controlling the flow of air through the air intake section to the outer radial stage of the fan.

14. The turbomachine system of claim 11, wherein the flow directing system is configured to direct the ambient air drawn in by the outer radial stage of the fan at an angle toward and into the exhaust gas stream.

15. The turbomachine system of claim 14, wherein the flow directing system comprises a guide vane system.

16. The turbomachine system of claim 11, further comprising a selective catalytic reduction (SCR) system for processing the reduced temperature exhaust gas stream.

17. The turbomachine system of claim 11, further comprising a heat recovery steam generator (HRSG) system for processing the reduced temperature exhaust gas stream.

18. A power generation system, comprising:

a gas turbine system including a compressor component, a combustor component, and a turbine component;

a shaft driven by the turbine component;

an electrical generator coupled to the shaft for generating electricity;

a fan coupled to an expander shaft of the gas turbine system, downstream of the gas turbine system, for drawing in a flow of ambient air through an air intake section, wherein the fan comprises an inner radial stage for passing the exhaust gas stream produced by the gas turbine system to the mixing area, and an outer radial stage for drawing in the flow of ambient air through the air intake section;

a mixing area for receiving an exhaust gas stream produced by the gas turbine system; and

a flow directing system for directing the flow of ambient air drawn in by the airflow generation system to the mixing area to reduce a temperature of the exhaust gas stream.

19. The power generation system of claim 18, further comprising:

a selective catalytic reduction (SCR) system for processing the reduced temperature exhaust gas stream;

or

a heat recovery steam generator (HRSG) system for processing the reduced temperature exhaust gas stream.

20. The power generation system of claim 18, further comprising a moving seal on the fan for preventing the exhaust gas stream from entering the air intake section.