Patent ID: 6530207
Filing Date: 2003-03-11
Classification: F02C,F05D,Y02E

Abstract:
A gas turbine system which comprises a compressor, a gas turbine-combustor, a gas turbine and a generator, which are operatively connected in series, a combustion monitoring device for detecting NOx concentration of an exhaust gas to be exhausted from the gas turbine so as to monitor combustion condition of the combustion gas in the gas turbine-combustor, and a gas turbine controller operatively connected to the combustion monitoring device and provided with a NOx value predictor,said combustion monitoring device comprising: an alarm signal calculation circuit for operating an alarm signal based on the NOx concentration detected from the exhaust gas at a time when flashback of the combustion gas in the gas turbine-combustor occurs to reach a premixed combustion zone; a shutdown calculation circuit for operating a shutdown command when said flashback grows into a prescribed scale; and a flashback-error signal prevention calculation circuit for compensating signal delay of the NOx concentration detected from the exhaust gas in accordance with a predicted NOx concentration value signal from the NOx value predictor.