초록 ▼

A method is disclosed for controlling gas turbine operation in response to lean blowout of a combustion can. The gas turbine comprises a pair of combustion cans. The method includes sensing that a first combustion can is extinguished during a full load operation of the gas turbine, adjusting a fuel

A method is disclosed for controlling gas turbine operation in response to lean blowout of a combustion can. The gas turbine comprises a pair of combustion cans. The method includes sensing that a first combustion can is extinguished during a full load operation of the gas turbine, adjusting a fuel ratio between the fuel nozzles in each can, delivering a richer fuel mixture to the fuel nozzles nearest to the cross-fire tubes, generating a cross-fire from the second combustion can to the first combustion can, detecting a recovery of the turbine load, and adjusting the fuel ratio to the normal balanced fuel distribution between the fuel nozzles in each can.

대표청구항 ▼

1. A method of controlling gas turbine operation in response to lean blowout of a combustion can, wherein a gas turbine comprises at least two combustion cans, a first combustion can comprising a first plurality of fuel nozzles; a second combustion can comprising a second plurality of fuel nozzles;

1. A method of controlling gas turbine operation in response to lean blowout of a combustion can, wherein a gas turbine comprises at least two combustion cans, a first combustion can comprising a first plurality of fuel nozzles; a second combustion can comprising a second plurality of fuel nozzles; the method comprising: sensing that the first combustion can is extinguished during a full load operation of the gas turbine;adjusting a fuel ratio between at least one of the first plurality of fuel nozzles in the first combustion can and at least one of the second plurality of fuel nozzles in the second combustion can;delivering a richer fuel mixture to the at least one of the second plurality of fuel nozzles wherein the at least one of the second plurality of fuel nozzles is a fuel nozzle nearest to a cross-fire tube;generating a cross-fire from the second combustion can to the first combustion can via the cross-fire tube;detecting a recovery of the full load operation of the gas turbine; andadjusting the fuel ratio to a balanced fuel distribution between the first and second plurality of fuel nozzles. 2. The method of claim 1, wherein the step of adjusting a fuel ratio further comprises: in response to sensing a decrease in an operating load, initiating reignition. 3. The method of claim 1, wherein the step of adjusting a fuel ratio further comprises generating a command by a controller to adjust the fuel ratio between the first and second plurality of fuel nozzles. 4. The method of claim 1, wherein the step of generating a cross-fire further comprises: causing flame from the second combustion can to bridge across to the first combustion can to reignite the first combustion can. 5. The method of claim 1, further comprising waiting a an interval, and sensing a load recovery. 6. The method of claim 1, wherein the step of adjusting the fuel ratio to the balanced fuel distribution between combustion fuel nozzles further comprises generating a signal from a controller to return the fuel ratio to the balanced fuel distribution. 7. A method as set forth in claim 1, wherein each step is performed automatically. 8. A control system for a gas turbine comprising: a compressor, a turbine drivingly coupled to the compressor, a control system; a first combustion can comprising a first plurality of fuel nozzles; and a second combustion can comprising a second plurality of fuel nozzles;the control system further comprising a controller configured to:sense the first combustion can being extinguished during a full load operation of the gas turbine;adjust a fuel ratio between at least one of the first plurality of fuel nozzles in the first combustion can and at least one of the second plurality of fuel nozzles in the second combustion can; deliver a richer fuel mixture to the at least one of the second plurality of fuel nozzles wherein the at least one of the second plurality of fuel nozzles is a fuel nozzle nearest to a cross-fire tube in communication with the first combustion can;generate a cross-fire from the second combustion can to the first combustion can;detect a recovery of the full load operation of the gas turbine;adjust the fuel ratio to a balanced fuel distribution between the first and second plurality of fuel nozzles; andin response to sensing an imbalance in an operating load, initiating reignition. 9. The system of claim 8, wherein the controller is further configured to generate a command to adjust the fuel ratio between the first and second plurality of fuel nozzles. 10. The system of claim 8, wherein the controller is further configured to generate a cross-fire by inducing flame from the second combustion can to bridge across to the first combustion can to reignite the first combustion can. 11. The system of claim 8, wherein the controller is further configured to pause for an interval, sense a turbine parameter, and determine if the operating load has recovered. 12. The system of claim 8, wherein the controller is further configured to generate a signal from the controller to distribute the fuel equally between combustion cans. 13. The system of claim 11, wherein the turbine parameter comprises temperatures, pressures, and gas flows at predetermined locations in the turbine. 14. The system of claim 13, wherein the turbine parameter represents a given turbine operating condition. 15. The system of claim 8, wherein the control system further comprises a fuel control system; the fuel control system configured to regulate at least one of: fuel flowing from a fuel supply to the first combustion can and the second combustion can, the division of fuel flow between the first and second plurality of fuel nozzles, and a fuel mixed with air flowing into the second combustion can. 16. The control system of claim 8, wherein the control system is configured to generate and implement fuel ratio commands that determine a portion of fuel flowing to the first plurality of fuel nozzles and a portion of fuel flowing to the second plurality of fuel nozzles. 17. A computer program product embodied on a non-transitory computer readable medium and executable by a microprocessor controller for determining a lean blowout of a combustion can of a gas turbine engine the gas turbine comprising at least a first combustion can comprising a first plurality of fuel nozzles and a second combustion can comprising a second plurality of fuel nozzles; the computer program product comprising instructions to: sense the first combustion can being extinguished during a full load operation of the gas turbine;adjust a fuel ratio between at least one of the first plurality of fuel nozzles in the first combustion can and at least one of the second plurality of fuel nozzles in the second combustion can;deliver a richer fuel mixture to the at least one of the second plurality of fuel nozzles wherein the at least one of the second plurality of fuel nozzles is a fuel nozzle nearest to a cross-fire tube;generate a cross-fire from the second combustion can to the first combustion can;detect a recovery of the full load operation of the gas tubine; andadjust the fuel ratio to a balanced fuel distribution between the first and second plurality of fuel nozzles. 18. The computer program product of claim 17, further comprising instructions to: generate a cross-fire by inducing flame from the second combustion can to bridge across to the first combustion can to reignite the first combustion can. 19. The computer program product of claim 17, further comprising instructions to: pause for an interval, sense a turbine parameter, and determine if the shared load is approximately equal between the first combustion can and the second combustion can.