초록 ▼

A method and controller for identifying lean blowout conditions in a Dry Low NOx (DLN) combustor during a premix mode. An effective approach to quickly and reliably identify a blowout during operation in the premix mode is by the effect on fuel normalized power (FNP). FNP is a useful signal, in that

A method and controller for identifying lean blowout conditions in a Dry Low NOx (DLN) combustor during a premix mode. An effective approach to quickly and reliably identify a blowout during operation in the premix mode is by the effect on fuel normalized power (FNP). FNP is a useful signal, in that a power reduction from a blowout may be distinguished much slower changes in power resulting from global fuel demand (changing load request). A difference between the FNP and a filtered FNP parameter may be compared against a predetermined threshold. If the difference exceeds the threshold, a lean blowout is identified and a signal may be transmitted to the turbine controller to reposition combustor operation away from blowout conditions.

대표청구항 ▼

The invention claimed is: 1. A method for detecting a lean blowout in a combustion can of a gas turbine engine, the method comprising:detecting a shift in generated power output that does not result from a changing fuel demand;determining that the shift in generated power output results from a lean

The invention claimed is: 1. A method for detecting a lean blowout in a combustion can of a gas turbine engine, the method comprising:detecting a shift in generated power output that does not result from a changing fuel demand;determining that the shift in generated power output results from a lean blowout in a combustor;transmitting a signal to a turbine controller to initiate action to increase margin to lean blowout in all combustors; andimplementing a response increasing margin to lean blowout for all combustors; wherein the step of detecting a shift in generated power output that does not result from a changing fuel demand comprising calculating Fuel Normalized Power (FNP) according to: where Power is represented in Driven Megawatts at the output of the generator; Fuelref represents Total Fuel Reference demand supplied to the machine; and FuelrefFSNL represents Fuel Reference required at Full Speed No Load; and wherein the step of detecting a shift in generated power output that does not result from a changing fuel demand further comprising: tracking the calculated FNP; applying a filter to the calculated FNP to establish a filtered FNP; tracking the filtered FNP; and determining a difference between the filtered FNP and the calculated FNP; and wherein the step of determining that the shift in generated power output results from a lean blowout in a combustor comprising: determining if the difference between the filtered FNP and the calculated FNP exceeds a predetermined threshold.