Turbine anti-rotating stall schedule

• US 7,972,105 B2
• Filed: 05/10/2007
• Issued: 07/05/2011
• Est. Priority Date: 05/10/2007
• Status: Active Grant

• Current Assignee: GE Infrastructure Technology, LLC (GE Vernova, Inc.)
• Original Assignee: General Electric Company
• Inventors: Martin, Nick, Schirle, Steven M., Dutka, Michael J., Dejoris, Timothy
• Primary Examiner(s): VERDIER, CHRISTOPHER M
• Application Number:
  US11/746,860
• Publication Number:
  US 20080279676A1
• Time in Patent Office: 1,517 Days
• Field of Search: 415/1, 415/10, 415 28- 29, 415 36- 40, 415/42, 415/119, 415/145, 415/149.1, 415/149.2, 415/149.4, 415/151, 415159-162, 607/72, 607/79, 607/82, 607/95
• US Class Current: 415/1
• CPC Class Codes: F01D 19/00 Starting of machines or engines; Regulating, controlling, or safety means in connection therewith warming-up before starting F01D25/10; turning or inching gear F01D25/34
• CPC Class Codes: F02C 6/08 the gas being bled from the gas-turbine compressor
• CPC Class Codes: F02C 9/18 by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages F02C3/113 takes precedence
• CPC Class Codes: F02C 9/22 by adjusting turbine vanes
• CPC Class Codes: F04D 27/0223 Control schemes therefor
• CPC Class Codes: F04D 27/023 Details or means for fluid extraction
• CPC Class Codes: F04D 27/0246 by varying geometry within the pumps, e.g. by adjusting vanes
• CPC Class Codes: F04D 29/522 especially adapted for elastic fluid pumps

Abstract

A method of starting up a turbine with a compressor have an inlet guide vane, a number of bleed valves, and a number of blades so as to limit the duration in a rotating stall window. The method may include starting rotation of the blades, increasing the speed of the rotation of the blades, closing one or more bleed valves so as to shift the rotating stall window to a higher rotational speed, partially opening the inlet guide vane to a position outside the rotating stall window, and opening the bleed valves while partially closing the inlet guide vane such that the number of blades pass through the rotating stall window.

Claims

1. A method of starting up a turbine with a compressor have an inlet guide vane, a number of bleed valves, and a number of blades so as to limit the duration in a rotating stall window, comprising:

starting rotation of the number of blades;

increasing the speed of the rotation of the blades;

closing one or more bleed valves so as to shift the rotating stall window to a higher rotational speed;

partially opening the inlet guide vane to a position outside the rotating stall window; and

opening one or more of the bleed valves while partially closing the inlet guide vane such that the number of blades passes through the rotating stall window.

2. The method of claim 1, wherein a number of the bleed valves are closed at about 50 percent of an intended operating speed of the number of blades.

3. The method of claim 2, wherein a further number of bleed valves are closed at about 60 percent of the intended operating speed of the number of blades.

4. The method of claim 3, wherein the inlet guide vane is positioned at about 26 degrees.

5. The method of claim 1, wherein the inlet guide vane is modulated from about 26 degrees at about 69 percent of an intended operating speed to about 30 degrees at about 74 percent of the intended operating speed.

6. The method of claim 1, wherein the inlet guide vane is modulated from about 30 degrees to about 23 degrees at about 74 percent of the intended operating speed.

7. The method of claim 3, wherein all of the number of bleed valves are opened at about 74 percent of the intended operating speed.

8. The method of claim 1, wherein the step of opening one or more of the bleed valves while partially closing the inlet guide vane such that the number of blades passes through the rotating stall window comprises about one (1) second.

9. The method of claim 1, further comprising opening the inlet guide vane at about 84 percent of an intended operating speed.

10. The method of shutting down a turbine with the compressor have the inlet guide vane, the number of bleed valves, and the number of blades so as to limit the duration in the rotating stall window, comprising reversing the steps of claim 1.

11. A method of starting up a turbine with a compressor having an inlet guide vane, a number of bleed valves, and a number of blades so as to limit the duration in a rotating stall window, comprising:

starting rotation of the number of blades;

increasing the speed of the rotation of the blades;

closing one or more bleed valves so as to shift the rotating stall window to a higher rotational speed;

modulating the inlet guide vane; and

opening the one or more of the bleed valves while modulating the inlet guide vane such that the number of blades passes through the rotating stall window.

12. The method of claim 11, wherein the step of closing the one or more bleed valves so as to shift the rotating stall window to a higher rotational speed comprises shifting the rotating stall window beyond a synchronous rotating stall range.

13. The method of claim 11, wherein the step of modulating the inlet guide vane such that the number of blades pass through the rotating stall window comprises about one (1) second.

14. The method of claim 11, the one or more bleed valves are closed from about 50 percent to about 74 percent of an intended operating speed of the number of blades.

15. The method of claim 11, wherein the inlet guide vane is positioned at about 26 degrees until about 69 percent of an intended operating speed.

16. The method of claim 11, wherein the inlet guide vane is modulated to about 30 degrees from about 69 percent to about 74 percent of the intended operating speed.

17. The method of claim 16, wherein the inlet guide vane is modulated to about 23 degrees at about 74 percent of the intended operating speed.

18. The method of claim 11, further comprising opening the inlet guide vane at about 84 percent of an intended operating speed.

19. The method of shutting down a turbine with the compressor have the inlet guide vane, the number of bleed valves, and the number of blades so as to limit the duration in the rotating stall window, comprising reversing the steps of claim 11.