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In a method of minimizing thermoacoustic vibrations in gas-turbine combustion chambers, a modulated spraying of liquid or gaseous premix fuel into a premix burner is carried out. The premix fuel is fed by means of two fuel lines (13, 14), and the modulation of the quantity of fed fuel is effected in

In a method of minimizing thermoacoustic vibrations in gas-turbine combustion chambers, a modulated spraying of liquid or gaseous premix fuel into a premix burner is carried out. The premix fuel is fed by means of two fuel lines (13, 14), and the modulation of the quantity of fed fuel is effected in each case by one fuel valve per fuel line.

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1. A method for minimizing a pressure amplitude of thermoacoustic vibrations in a combustion system, the method comprising:measuring a pressure in the combustion system; feeding a first quantity of fuel through a first fuel line in a pulsating process based on the measured pressure in the combustion

1. A method for minimizing a pressure amplitude of thermoacoustic vibrations in a combustion system, the method comprising:measuring a pressure in the combustion system; feeding a first quantity of fuel through a first fuel line in a pulsating process based on the measured pressure in the combustion system where feeding the first quantity of fuel to the first fuel line minimizes the pressure amplitude of thermoacoustic vibrations; feeding a second quantity of fuel through a second fuel line in a pulsating process based on the measured pressure in the combustion system where feeding the second quantity of fuel to the second fuel line minimizes the pressure amplitude of thermoacoustic vibrations; and completing a modulation period, the modulation period including the feeding of the first quantity of fuel and the feeding of the second quantity of fuel wherein a pulse of the pulsating process is limited with respect to both time and subsequent feeding of the second quantity of fuel. 2. The method according to claim 1, wherein an instantaneous spraying of liquid or gaseous premix fuel is phase-coupled with a signal measured in the combustion chamber.3. The method according to claim 2, in which the signal measured in the combustion system is filtered, phase-shifted and amplified, and the signal which is thus obtained controls fuel valves, which regulate the instantaneous spraying of liquid or gaseous premix fuel.4. The method according to claim 2, wherein the signal measured in the combustion system is a chemiluminescence signal.5. The method according to claim 2, in which the signal measured in the combustion system is measured in the combustion chamber or in a steadying chamber.6. The method according to claim 1, wherein the modulation of the fed quantity of premix fuel in the two fuel lines is effected with any relative phase displacement φ.7. The method according to claim 6, wherein the modulation of the fed quantity of premix fuel in the two fuel lines is effected with a phase displacement φ=180°.