Method and device for acoustic modulation of a flame produced by a hybrid burner
AssigneeSiemens Aktiengesellschaft
InventorsJörg Seume, Nicolas Vortmeyer, Stephan Gleis, Jakob Hermann, Dieter Vortmeyer
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Abstract
A method and a device for acoustic modulation of a flame through the use of an acoustically modulated feeding of a fuel. The flame is produced by burning the fuel in a hybrid burner including a premixing burner and a pilot burner associated with the latter. The fuel is fed to the premixing burner in a main flow and to the pilot burner in a pilot flow. The pilot flow is modulated and the main flow is not modulated. The invention is of particular interest for suppressing combustion oscillations in a combustion chamber to which the hybrid burner is connected.
Claims6
A method of acoustic modulation of a flame by acoustically modulated feeding of a fuel, which comprises:
- producing a flame in a combustion chamber in which acoustic oscillations prevail, by burning a fuel with a hybrid burner having a premixing burner and a pilot burner associated with the premixing burner;
- feeding the fuel to the premixing burner in an unmodulated main flow and to the pilot burner in a modulated pilot flow;
- generating a sensor signal truly reproducing the acoustic oscillations;
- phase-shifting the sensor signal to produce a modulation signal modulating the pilot flow;
- and
- effecting negative feedback to the acoustic oscillations in the combustion chamber with the flame by adjusting said phase-shifting.
A device for acoustic modulation of a flame by acoustically modulated feeding of a fuel, comprising:
- a combustion chamber;
- a hybrid burner connected to said combustion chamber for producing a flame in said combustion chamber by burning a fuel, said hybrid burner having a premixing burner and a pilot burner associated with said premixing burner;
- a main line feeding the fuel to said premixing burner;
- a pilot line feeding a pilot flow of the fuel through said pilot burner to the flame;
- a modulator disposed in said pilot line for permitting modulation of the pilot flow;
- a sensor connected to said combustion chamber for generating a sensor signal truly reproducing acoustic oscillations in said combustion chamber;
- and
- a modulation device connected to said sensor for receiving the sensor signal and for generating a modulation signal by phase-shifting the sensor signal, said modulation device connected to said modulator for transmitting the modulation signal to said modulator.
Dependencies are inferred from the claim text.