Alstom Technology Limited

Abb Research Ltd.

Alstom

Alstom (switzerland) Ltd

Peter Jansohn

Timothy Albert Griffin

Christian Steinbach

Thomas R Ruck

Sasha Savic

Alexander Ni

Elisabetta Carrea

Thomas Sattelmayer

Hans Peter Knopfel

Klaus Dobbeling

Dieter Winkler

Thomas Ruck

Wolfgang Weisenstein

Verena Schmidt

Jonathan Lloyd

Tino-Martin Marling

Franz B&uuml;chi

Dieter K&ouml;ster

Leif Andersson

Uwe Hoferer

In a method for the combustion of a fuel, a fuel or a premixed combustible mixture is introduced into a combustion space as a combustible fluid open jet. The velocity of the open jet is selected in such a way that it is impossible for a stable flame front to form, i.e. is in any event greater than the flame front velocity, and that, on account of a jet pump effect, flue gas is mixed into the combustible fluid jet from the combustion chamber in a jet-induced recirculation internally within the combustion chamber. The admixed flue gas dilutes and heats the combustible fluid. The heating causes the spontaneous ignition temperature to be exceeded, and a low-pollutant volumetric flame is formed in a highly dilute atmosphere.

Method for combustion of a fuel

A gas turbine adapted to operate in a highly diluted mode comprises a compressoradapted to compress oxidant; a combustion chamberadapted to accept the compressed oxidantand provide an exit means for flue gas; a turbine; and a flue gas re-circulation meansadapted to re-circulate the flue gasfrom the combustion chamberand mix the said flue gas with the compressed oxidantfrom the compressorin order to provide a highly diluted mode of combustion with a flue gas re-circulation rate of from 100% to 200%.

Gas turbine having exhaust recirculation

In an atomizer device for the production of a liquid-gas mixture (), the mixture () is introduced, particularly for compression, into a nozzle arrangement () in which the kinetic energy of the mixture () is in large part converted into compression energy by a pressure rise of the air. The atomizer device () includes a central air feed () and a nozzle chamber () for the supply of liquid surrounding the air feed. At or in the atomizing device, means () are arranged in the nozzle chamber for producing a swirled liquid flow in the nozzle chamber (), and the swirled liquid flow emerges via a nozzle aperture () surrounding the air feed.

Atomizer device and method for the production of a liquid-gas mixture

In a method and a device for intermediate cooling during compression in a gas turbine system, the gas turbine system includes at least one first () and one second compressor (), a combustion chamber (), and a turbine (). At least one intermediate cooler () is located between the first () and second compressor (). The intermediate cooling takes place at least in part or for the most part isentropically.

Method for intermediate cooling and gas turbine system with intermediate cooling

A catalytically operating burner with a catalyzer structure (), useful in particular for a gas turbine system, has a heat-resistant carrier material () that forms the walls of several adjoining channels (). The channels () pervade the catalyzer structure () in longitudinal direction and permit that a gaseous reaction mixture flows through the catalyzer structure (). The walls are coated at least in part with a catalyst. In order to improve the catalytic conversion within the catalyzer structure (), communicating openings () are constructed in the walls between an inlet end and an outlet end of the catalyzer structure (). Adjoining channels () are able to communicate with each other through the communicating openings ().

Catalytically operating burner

The invention relates to a premix burner with high flame stability for use in a heat generator, preferably in the combustion chamber of a gas turbine. Modern, lean-operated premix burners enable very low noxious emissions, but sometimes operate very close to the extinction limit. To increase the stability of the lean premix combustion by increasing the distance between flame temperature and extinction limit temperature the invention proposes to equip the burner in the mixing zone ( ) with a net-like structure ( ) for the premixing of combustion air and fuel. According to a preferred embodiment, the net-like structure ( ) consists of a plurality of layers of individual wire mesh fabrics ( ) arranged at a distance from each other. The wire mesh fabrics ( ) are preferably equipped with an oxidation-promoting, catalytically active surface. It was found that the net structure ( ) positively influences the thermoacoustic behavior of the burner and dampens and insulates pressure waves from the combustion chamber ( ), and in this way reduces the excitation of pressure waves in the combustion chamber ( ).

Premix burner with high flame stability having a net-like structure within the mixing section

Premix burner arrangement for operating a combustion chamber

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

Combined pressure atomizing nozzle

In a burner for operating a combustion chamber, which burner essentially comprises a swirl generator (,), a transition piece (,) arranged downstream of the swirl generator, and a mixing tube (,), transition piece (,) and mixing tube (,) forming the mixing section of the burner and being arranged upstream of a combustion space (,). A pilot-burner system (,) is arranged in the lower region of the mixing tube (,), which pilot-burner system (,), at minimized pollutant emissions, stabilizes the flame front, in particular in the transient load ranges. At least one ignition device (,) is integrated in the pilot-burner system (,).

Burner for operating a heat generator

The object of the invention is to provide a novel combustion chamber which has an improved air supply and also ensures an optimum incident flow to the burners when the mass flows of cooling and combustion air are different. According to the invention, this is achieved in that the at least one cooling duct (10) is extended right into the plenum (13) and is formed inside the plenum (13) as a diffuser (14) having an orifice (12) leading into the plenum (13). The at least one opening (15, 15') in the burner dome (4) is arranged in the region of the diffuser (14) or directly downstream of its orifice (12). A bypass duct (16, 16') having an orifice (17, 17') leading into the plenum (13) follows downstream of each opening (15, 15'). The orifice (17, 17') of each bypass duct (16, 16') is oriented at least approximately in parallel with the orifice (12) of the diffuser (14) and is also designed so as to be offset step-like to the outside. Each bypass duct (16, 16') is provided with a pressure-regulating device (18, 18').

Combustion chamber

A pressure atomizer nozzle comprises a nozzle body (30) in which is formed a turbulence and/or swirl chamber (39) and having a nozzle bore (33). At least one first feed channel (41, 41a) for the liquid (37) to be atomized connects to the chamber as a first feed stage for feeding said liquid (37) under pressure. At least one second feed channel (38) connects to the chamber as a second feed stage for feeding part of the liquid (37) to be atomized or for feeding a second liquid (37') to be atomized. The second feed channel feeds liquid into the chamber under pressure and with a swirl. The two stage pressure atomizer nozzle allows, for example, simple adaptation of the fuel spray cone angle to the respective operating conditions of a gas turbine burner.

Pressure atomizer nozzle

In a firing installation which is designed to minimize the pollutant emissions during the use of both a liquid and a gaseous fuel, an annular chamber (12) is arranged downstream of a first combustion stage (1) on the head side of a second combustion stage (2) arranged downstream. The first combustion stage (1) is operated as a lean stage with a burner (100), while the second combustion stage (2) is operated as a near-stiochiometric stage. The wall of the annular chamber (12) has a number of openings (13) for the inflow of a mixture (14) of recycled flue gas (4) and fuel (15). The combustion air (115) for the burner (100) is likewise a mixture (6) of air (3) and recycled flue gas (4). The hot gases from this first combustion stage (1) are moderated before entering the second combustion stage (2), self-igniting combustion taking place in this second combustion stage (2) starting from the annular chamber (12).

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Kuessaberg, Germany

Peter Jansohn