Method and apparatus for detecting combustion conditions in combustors of a sequential combustion gas turbine engine

摘要

In a method for operating a gas turbine (10), a CO2-containing gas is compressed in a compressor (13), the compressed gas is used to burn a fuel in at least one subsequent combustion chamber (14, 18), and the hot combustion gases are used to drive at least one turbine (17, 21). Improved control and performance can be achieved by measuring the species concentration of the gas mixture flowing through the gas turbine (10) at several points within the gas turbine (10) by a distributed plurality of species concentration sensors (22; 22a-1; 23), and utilizing the measured concentration values to control the gas turbine (10) and/or optimize the combustion performance of the gas turbine (10).

主权项

1. A method for operating a gas turbine, in which turbine a CO2-containing gas is compressed in a compressor, the compressed gas being used to burn a fuel in a first combustor having first burners to form hot combustion gas that is fed to a first turbine to drive the first turbine, the gas turbine also comprising a second combustor having second burners downstream of the first turbine that forms hot combustion gas that is fed to a second turbine to drive the second turbine, the method comprising:
measuring species concentrations of a gas mixture flowing through the gas turbine at several points within the gas turbine with a distributed plurality of species concentration sensors, the species comprising O2 and at least one other specie; and controlling the gas turbine, optimizing the combustion performance of said gas turbine, or both, based on the measured species concentration values, the controlling of the gas turbine, optimizing the combustion performance of the gas turbine, or both based on the measured species concentration values comprising:
controlling fuel supply valves that are adjustable to facilitate a flow of fuel to the second burners to control a flow of fuel to the second combustor based on a measurement of an O2 profile of the gas mixture flowing through the gas turbine that is based on measurements from the species concentration sensors located adjacent to at least one of an outlet of the first turbine and in the first combustor.