Gas turbine system
First Claim
1. 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.
3 Assignments
0 Petitions
Accused Products
Abstract
A gas turbine system comprises an alarm signal calculation circuit, a shutdown calculation circuit and a flashback-error signal prevention calculation circuit. The alarm signal calculation circuit, the shutdown calculation circuit and the flashback-error signal prevention calculation circuit are integrated in a combustion monitoring device for monitoring combustion condition of combustion gas in a gas turbine-combustor.
-
Citations
13 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. 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 combustion gas in the gas turbine-combustor, and a gas turbine controller operatively connected to the combustion monitoring device,
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 at a time when said flashback grows into a prescribed scale; and
a delay prevention calculation circuit for calculating NOx concentrations of a plurality of previous periods of all previous periods of a current NOx concentration detected from the exhaust gas so as to compensate signal delay of the current NOx concentration. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. 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 heat recovery steam generator operatively connected to the gas turbine, 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 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 having a NOx sensor disposed on an upstream side of a catalyst disposed to the heat recovery steam generator for detecting the NOx concentration of the exhaust gas, said alarm signal calculation circuit operating an alarm signal based on the NOx concentration detected by said NOx sensor 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 at a time 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 by said NOx sensor in accordance with a predicted NOx concentration value signal from the NOx value predictor.
-
Specification