Patent ID: 8868313
Filing Date: 2014-10-21
Classification: F23N,F23R

Abstract:
1. A method for controlling the combustion in a gas turbine of the type comprising at least one compressor capable of compressing air introduced therein through an inlet duct, at least one combustion chamber, wherein said compressed air is mixed with a gaseous fuel coming from a supply duct, and wherein the gas turbine transforms energy of the gas coming from said combustion chamber into work energy, the method comprising: measuring, with one or more probes situated adjacent to said combustion chamber, an amplitude of pressure oscillations inside the combustion chamber and a persistence time or cycle of the pressure oscillations; evaluating a behavior under fatigue conditions of said combustion chamber by constructing a Wohler curve for a material which forms said combustion chamber, for a predefined combustion frequency and for said amplitude of pressure oscillations and cycle values of the measured pressure oscillations, wherein the Wohler curve is constructed using at least two pressure oscillation measurements from the probes adjacent to said combustion chamber during fatigue conditions; measuring a cumulative damage to said combustion chamber during functioning under fatigue conditions of said gas turbine by means of a Palmgren-Miner hypothesis; said Palmgren-Miner hypothesis being defined as: wherein: undertaking protective actions for said turbine when the cumulative damage value measured is exceeded.