Alstom (Switzerland) Ltd

Alstom

Alstom Technology Limited

Abb Research Ltd.

Abb Schweiz Ag

Wolfgang Weisenstein

Christian Oliver Paschereit

Ephraim J Gutmark

Wolfgang Polifke

Timothy Albert Griffin

Peter Flohr

Peter Jansohn

Thomas R Ruck

Klaus D&ouml;bbeling

Christopher Ganz

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 (), and the modulation of the quantity of fed fuel is effected in each case by one fuel valve per fuel line.

Method and apparatus for minimizing thermoacoustic vibrations in gas-turbine combustion chambers

In a gas turbine having a combustion chamber ( ) and a first row of guide vanes ( ) arranged on the outflow side of the combustion chamber ( ), a plurality of temperature sensors ( ) for measuring temperature value, and a plurality of means ( ) for introducing fuel into the combustion chamber ( ), which means can be controlled on the basis of the temperature values, the temperature sensors ( ) are spectrometers, are designed to measure a combustion-gas temperature and are arranged so as to measure a gas temperature which prevails immediately in front of the first row of guide vanes ( ).

Gas turbine and method for suppressing azimuthal fluctuation modes in a gas turbine

Method of and appliance for suppressing flow eddies within a turbomachine

An apparatus for damping acoustic vibrations in a combustor as well as a corresponding combustor arrangement with the apparatus. The apparatus includes a Helmholtz resonator ( ) that can be connected via a connecting channel ( ) with a combustor ( ). The Helmholtz resonator ( ) contains a hollow body ( ) the volume of which can be changed by adding or draining a fluid via a supply line ( ), or is located adjacent to such a hollow body in such a way that the resonance volume ( ) of the Helmholtz resonator ( ) is changed when the volume of the hollow body ( ) is changed. This apparatus makes it possible to adjust the resonance frequency of a Helmholtz resonator arranged inside a pressure container in accordance with the respective current operating point of the combustor to be damped, without having to pass movable components through the pressure container.

Apparatus for damping acoustic vibrations in a combustor

A premix burner arrangement with catalytic combustion provides a fuel/air mixture to a combustion chamber of a gas turbine arrangement. The premix burner arrangement includes a premix burner, at least one fuel addition unit, and air inlet openings arranged in such a way that at least one of gaseous and liquid fuel can be mixed with combustion inlet air inside the premix burner to form a fuel/air mixture. The fuel/air mixture exits from the premix burner downstream in the direction towards a combustion chamber positioned after the premix burner arrangement and can be ignited inside the combustion chamber. A catalyzer unit is provided before the entrance of the fuel/air mixture into the combustion chamber. Part of the fuel/air mixture can be introduced into and passed through the catalyzer unit before the catalyzed part of the fuel/air mixture flows together with the remaining portion of the fuel/air mixture into the combustion chamber.

Premix burner arrangement with catalytic combustion and method for its operation

The subject of the invention is a method as well as an apparatus for suppressing flow vortices within a turbo power machine with a premix burner, into which fuel and air are introduced for mixing, which then leave the burner downstream along its burner axis in the form of a fuel/air mixture through a burner outlet and flow into a combustor located downstream from the burner in the flow direction of the fuel/air mixture. The invention is based on the basic idea of&mdash;for the fluid-mechanical stabilization of a premix burner, into which at least one combustion air stream ( ) is fed tangentially into a burner chamber ( ) and is mixed with an injected gaseous and/or liquid fuel ( ) while forming a swirl flow ( ) oriented coaxially to the burner axis and induces a reverse flow zone ( ) at a change in the cross-section on a burner mouth ( ), that is used during the operation of the burner to stabilize the flame&mdash;increasingly, radially deforming the swirl flow ( ) within the burner chamber ( ) in the direction of the burner mouth ( ) and let it enter the combustor ( ) in a non-rotation-symmetrical flow cross-section, whereby this deformation is created by reducing the free flow cross-section ( ) of the burner chamber ( ). The fuel/air mixture flows into the combustor with a non-rotation-symmetrical flow cross-section.

Premix burner

Vibration reduction in a combustion chamber

In a method of controlling thermoacoustic vibrations in a combustion system having a combustion chamber and a burner, the fluid shear layer forming in the region of the burner is acoustically excited. An apparatus for controlling thermoacoustic vibrations in a combustion system having a combustion chamber and a burner is distinguished by the fact that device(s) for the acoustic excitation of the working gas are arranged in the region of the burner.

Method and apparatus for controlling thermoacoustic vibrations in a combustion system

In a method for minimizing thermoacoustic oscillations in gas turbine combustion chambers, an inert gas (N , CO , H O) is additionally mixed with the stream of fuel.

Method for minimizing thermoacoustic oscillations in gas turbine combustion chambers

In a method of suppressing or controlling thermoacoustic vibrations which develop in a combustion system having a burner working in a combustion chamber due to the formation of coherent or vortex structures and a periodic heat release associated therewith, in which method the vibrations are detected in a closed control loop and acoustic vibrations of a certain amplitude and phase are generated as a function of the detected vibrations and induced in the combustion system, improved suppression is achieved in that, within the control loop, the amplitude of the generated acoustic vibrations is selected to be proportional to the amplitude of the detected vibrations.

Method of controlling thermoacoustic vibrations in a combustion system, and combustion system

A burner for generating a hot gas including at least two hollow partial bodies stacked inside each other in a downstream air flow direction. The center axes of the hollow bodies extend offset to each other such that burner slits formed by adjoining walls of the partial bodies form tangential air inlet channels for an inflow of combustion air into an inside chamber defined by the partial bodies. The hollow bodies are provided with a plurality of baffles projecting into the downstream air flow. The plurality of baffles add an axial turbulence force to the air flow.

Burner

A burner for operating a unit for generating a hot gas consists essentially of at least two hollow partial bodies (,) which are interleaved in the flow direction and whose center lines extend offset relative to one another in such a way that adjacent walls of the partial bodies (,) form tangential air inlet ducts (,) for the inlet flow of combustion air (,) into an internal space (,) prescribed by the partial bodies (,). The burner has at least one fuel nozzle (,). In order to control flow instabilities in the burner, the inside of the burner outlet (,) has a plurality of nozzles (,) along the periphery of the burner outlet (,) for introducing axial vorticity into the flow, the nozzles (,) for injecting air (,) being arranged at an angle to the flow direction (,).

Growing community of inventors

Remetschwil, Switzerland

Wolfgang Weisenstein