Method and system for detection of gas turbine combustion blowouts utilizing fuel normalized power response

摘要

A method and controller for identifying lean blowout conditions in a Dry Low NOx (DLN) combustor of a gas turbine 580 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) 515. FNP 515 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 520 between the calculated FNP 515 and a filtered FNP parameter 518 may be compared against a predetermined threshold 521. If the difference520 exceeds the predetermined threshold 521, a lean blowout is identified and a signal 525 may be transmitted to the turbine controls 575 to reposition combustor operation away from blowout conditions.