Patent ID: 7232308
Filing Date: 2007-06-19
Classification: F05B,F23C,F23R

Abstract:
1. A method for affecting thermoacoustic oscillations in a combustion system having at least one burner and at least one combustor, the method comprising: measuring a signal correlating with the thermoacoustic oscillations in the combustion system; subjecting the measured signal to a first phase shift; generating a first driver signal for driving at least one acoustic source to produce an instantaneous acoustic excitation of the gas flow; subjecting the measured signal to a second phase shift; generating a second driver signal for driving at least one control valve to produce an instantaneous modulated injection of the fuel; acoustically exciting a gas flow forming in the region of the burner with said at least one acoustic source based on said first driver signal; modulating injection of fuel with said at least one control valve based on said second driver signal; and coordinating the acoustic excitation of the gas flow and the modulated injection of the fuel to affect the same interference frequency of the thermoacoustic oscillations; wherein the instantaneous acoustic excitation of the gas flow and the instantaneous modulated injection of the fuel are phase-coupled with said signal correlating with the thermoacoustic oscillations in the combustion system.