Abstract:
It is described a combustion device control unit and a combustion device, e.g. a gas turbine, which determine on the basis of at least one operating parameter whether the combustion device is in a predefined operating stage. In response hereto, there is generated a control signal configured for setting a ratio of at least two different input fuel flows to a predetermined value (psc1, psc3) for a predetermined time (dt) in case the combustion device is in the predefined operating stage.
Abstract:
It is described a resonator device (101, 301) for damping a pressure oscillation within a combustion chamber (330), the resonator device comprising: a container (102, 302) filled with a gas; an opening (106, 306) in the container; and a heating element (103, 303) adapted to generate a flame, wherein the flame is arranged to heat the gas within the container. The resonator device is comprised in a combustion arrangement, further comprising a combustion chamber (330) for defining a combustion space for burning fuel, wherein the container is connected to the combustion chamber such that an inside of the container is in communication with the combustion space via the opening (306), wherein the resonator device has a resonance frequency equal to a pressure oscillation frequency within the combustion chamber under normal load conditions.
Abstract:
Disclosed is a combustor casing (5), with an inner casing (11) and an outer casing (12) and a bimetallic element (15) arranged on an inner side (16) of the inner casing (11). The inner casing (11) comprises a pre-chamber area, where combustion is initiated in a fuel rich state, with an upper end and a lower end, the upper end sized and configured to be connected to a burner head (2). The bimetallic element (15) is located within the pre-chamber area.
Abstract:
The present invention relates to a resonator (100) with an adaptable resonator frequency (f) for absorbing sound generated by a gas stream of a gas turbine (110). The resonator (100) comprises a neck section (102), a chamber (101) and a deformable element (103) being deformable under influence of a change of a gas turbine temperature of the gas stream. The shape of the deformable element (103) is predetermined with respect to a respective gas turbine temperature. The neck section (102) and the chamber (101) form a volume of the resonator (100). The neck section (102) forms a passage coupling the volume with the gas turbine (110). The deformable element (103) is thermally coupled to the gas turbine (110) in such a way that the shape of the deformable element (103) depends on the respective gas turbine temperature. The deformable element (103) forms a spiral (300) and is installed to the neck section (102) in such a way that an effective diameter (D 2, eff ) of the neck section (102) depends on the gas turbine temperature. The shape of the spiral (300) depends on the respective gas turbine temperature for selectively adapting the effective diameter (D 2, eff ) of the neck section.
Abstract:
A method for pressure dynamics reduction within a gas turbine engine with a number of combustion chambers (1), where a pilot fuel spilt is defined for each combustion chamber, is provided, comprising the steps of measuring the pressure values in each combustion chamber in time steps (21), determining the pressure change rates in the combustion chambers from the measured pressure values, and reducing the pilot fuel split to a particular combustion chamber' to zero (26) in case that the pressure change rate in this combustion chamber increases over two or more consecutive time steps (23) and exceeds the pressure change rate in all other combustion chambers (25) and the pressure change rate in this combustion chamber is above a maximum allowable pressure change limit (24).
Abstract:
It is described a combustion arrangement (100), comprising: a casing (101); a combustion chamber (103) arranged within the casing (101), wherein an inner casing volume (107, 109) is defined to be a volume inside the casing but outside the combustion chamber; a partitioning wall (105) partitioning the inner casing volume into a first volume portion (107) and a second volume portion (109), the partitioning wall having at least one aperture (111, 113) to allow fluid communication (145) between the first volume portion (107) and the second volume portion (109); and a valve (115) arranged at the casing to allow an outgoing fluid flow (116) from the inner casing volume (107, 109) to an outside (119) of the casing (101) depending on a valve operating position; wherein the combustion chamber has a combustion entry port (121) for supplying an oxidant into the combustion chamber (103), wherein the combustion entry port (121) is in fluid communication with the first volume portion (107), wherein the arrangement (100, 125) is adapted to adjust the valve operating position for damping an oscillation of the arrangement.
Abstract:
The present invention relates to a combustion system (100) for a gas turbine. The combustion system (100) comprises a combustion chamber (101) with a wall section (102) separating an outside of the combustion chamber (101) from an inside of the combustion chamber (101). The wall section (102) comprises a passage (106) for injecting a combustion medium into the combustion chamber (101). The combustion system (100) further comprises a resonator (103) with a neck section (104) and a resonator chamber (105), wherein the neck section (104) and the resonator chamber (105) form a resonator volume reducing vibrations within the combustion chamber (101). The resonator chamber (105) comprises a first inlet (107) for injecting gaseous medium into the resonator chamber (105) and a second inlet (108) for injecting fuel into the resonator chamber (105) such that a fuel/gas mixture is generated inside the resonator chamber (105). The neck section (104) is connected from the outside of the combustion chamber (101) to the passage (106) of the wall section (102), such that the combustion medium comprising the fuel/gas mixture is injectable into the combustion chamber (101).
Abstract:
A damping device (122; 222; 322; 422; 522) for damping pressure oscillations within a combustion chamber (106; 206; 306; 406; 506) of a turbine (102; 202; 302; 402; 402; 502) comprises a radially extending damping device body (123; 223; 323; 423; 523), wherein the damping device body (123; 223; 10 323; 423; 523) comprises a radially inner circumferential edge portion (124; 224; 324; 424; 524) and a radially outer circumferential edge portion (126; 226; 326; 426; 526), wherein a through hole (136a; 236a; 336a; 436a; 536a) is formed in the damping device body (123; 223; 323; 423; 523), wherein the through hole (136a; 236a; 336a; 436a; 536a) comprises a tapered shape.
Abstract:
A combustion apparatus includes an incoming fuel supply line (27), which supplies fuel in a plurality of fuel-supply lines (24, 25) to one or more burners (12), the burners being associated with a combustion volume. A temperature sensor (32) is located in the apparatus so as to yield temperature information relating to a component part (31) of the apparatus, which is to be prevented from overheating. The apparatus also includes a control arrangement (36), which detects the temperature-sensor output and, depending on that output, varies the fuel supplies to one or more of the burners in such a way as to maintain the temperature of the component part below a maximum value, while keeping the fuel in the incoming fuel supply line substantially constant. The control unit preferably also strives to adjust the operating conditions of the apparatus so that pressure oscillations are kept below a maximum value.
Abstract:
Fuel injection means for a swirler of a burner of a gas turbine engine, swirler for a burner of a gas turbine engine, burner of a gas turbine engine and gas turbine engine. The present invention is related to fuel injection means (50) for a swirler (52) of a burner of a gas turbine engine (10), the swirler (52) comprising a plurality of vanes (54) and a plurality of mixing channels between the vanes (54) to channel air (24) from a radially outer end of the mixing channel to a radially inner end of the mixing channel, of the fuel injection means (50) comprising at least two injection ports (62) to inject fuel (64) into the channelled air (24). Further, the invention is related to a swirler for a burner of a gas turbine engine, to a burner of a gas turbine engine and to a gas turbine engine.