Patents Assigned to Alstom (Switzerland) Ltd.
  • Patent number: 6575698
    Abstract: A honeycomb structure is arranged on a stator of a gas turbine and is arranged opposite the moving blades of the gas turbine. The honeycomb structure is composed of metal sheets in such a way that webs having double the sheet thickness are obtained and connections of single thickness are obtained between the webs. The angle &agr; between the circumferential direction of the stator and the webs of double thickness is 5° to 175°. This serves to avoid undesirable efforts such as, for example, overheating during friction at the honeycomb structure of the moving blades of the gas turbine.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: June 10, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Alexander Beeck, Ulrich Rathmann, Hans E. Wettstein
  • Patent number: 6571471
    Abstract: The invention relates to a method and a device for demounting a turbine blade out of an axial groove of a rotor or stator. The turbine blade is demounted with a hydraulic device by means of a hooked slide which is located in a gap between the blade base of the blade root and the groove bottom of the axial groove. At the same time, the hooks of the hooked slide engage into clearances which are located at the blade root.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: June 3, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventor: Siegfried Hohmann
  • Patent number: 6572334
    Abstract: The cap plate has an axially recessed region with a shoulder. The gas guiding ring half shells have a respective projecting rib. A retaining ring consisting of two retaining ring halves abuts with its first leg in the shoulder and is connected by means of fillister head screws to the cap plate. The gas guiding ring half shells are positioned with respect to the cap plate with clearance fit in the radial and axial direction. The ribs have a spacing in the peripheral direction at the separation place of the gas guiding ring half shells in order to form gaps. At the same location, the first leg of the retaining ring halves is interrupted for the formation of recesses aligned with the gaps. Fixing wedges are inserted in the region of the gaps and of the recesses and are screwed to the cap plate. These fixing wedges transfer the tangential forces from the gas guiding ring half shells to the retaining ring halves.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: June 3, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Daniel Hediger, Ernoe Stefan
  • Patent number: 6572328
    Abstract: A steam turbine for a combined gas and steam-turbine power plant process, including at least one valve arrangement for the controlled feeding of live steam into the steam turbine is disclosed. The valve arrangement has a quick-closing valve and at least one live-steam control valve assigned to the quick-closing valve. In addition, the steam turbine has a live-steam bypass, which, feeds live steam as “bypass steam” into the high-pressure region of the steam turbine through at least one bypass line and through a bypass feed assigned to each bypass line, but after the first turbine moving-blade row, as viewed downstream of the steam-turbine inlet region. At least one live-steam control valve and at least one bypass control valve are assigned to at least one quick-closing valve. Further, a method of feeding bypass steam into the steam turbine is disclosed.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: June 3, 2003
    Assignee: Alstom (Switzerland) Ltd.
    Inventors: Alexander Tremmel, Patrick Welz
  • Patent number: 6572366
    Abstract: What is described is a burner system with a premix burner (1), in which is provided at least one vortex generator (2), through which passes an air-containing gaseous main flow (ZL) which flows axially through the premix burner (1) and into which gaseous and/or liquid fuel is injected, downstream of the vortex generator (2), as a secondary flow for generating a fuel/air mixture, and with a combustion chamber (5) which adjoins the premix burner (1) downstream of the latter and has a combustion chamber cross section (C2) which is larger than the flow cross section (C1), delimited by the premix burner (1), directly upstream of the combustion chamber (5).
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: June 3, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Adnan Eroglu, Klaus Knapp, Bettina Paikert
  • Patent number: 6568254
    Abstract: The present invention relates to a method for monitoring the creep behavior of rotating components of a compressor stage or turbine stage. In the method, at least one test element (2) is mounted in a region of the compressor stage or turbine stage in which the test element is exposed to an operating load comparable to that of the component to be monitored. The test element (2) is investigated after a predeterminable operating period of the component to be monitored. Finally, the creep behavior of the component to be monitored is derived from the creep behavior of the test element. The method makes it possible to detect exactly the creep behavior or creep damage of the component to be monitored, during the useful life of this component.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: May 27, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventor: Jörg Pross
  • Patent number: 6565317
    Abstract: A platelike projecting component portion of a component used in gas turbines or other similar applications includes a surface upon which hot gas acts and cooling bores through which a cooling medium is capable of flowing. Effective cooling is achieved by providing at least one plenum assigned solely to the component portion. The plenum is arranged so as to be directly adjacent to the surface upon which hot gas acts and through which the cooling medium is capable of flowing to provide convective heat transfer. The cooling bores are designed as blow-out orifices which emanate from the plenum and issue the cooling medium onto the surface upon which hot gas acts, thereby forming a cooling film.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: May 20, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Alexander Beeck, Christoph Nagler, Mark Richter, Klaus Semmler, Lothar Schneider, Joerg Stengele
  • Patent number: 6563228
    Abstract: A power plant includes a gas turbine coupled to an electric generator. The electric generator can be connected to a high-voltage network through a generator switch and can be operated as a motor for the start-up of the gas turbine. The electric generator can also be connected to a static starting device for the run-up of the gas turbine. The static starting device is connected to a medium-voltage network which is provided for the auxiliary service of the power plant. The auxiliary voltage, provided in another way, of the medium-voltage network, produces a variable supply voltage for the generator operated as a motor. In such a plant, reduced circuit complexity is achieved by the fact that the static starting device is designed in such a way or can be activated in such a way that, after the run-up of the gas turbine, the static starting device itself produces the auxiliary voltage of the medium-voltage network from the voltage delivered by the generator.
    Type: Grant
    Filed: June 21, 2000
    Date of Patent: May 13, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventor: Hans-Werner Schlett
  • Patent number: 6558116
    Abstract: A turbo-generator comprising a shaft, on which is positioned an axial ventilator, a cover that divides an inflow chamber for a cooling gas transported by the axial ventilator from an outflow chamber for this cooling gas, and a cylindrical channel segment that is positioned coaxially to the axial compressor and surrounds the axial compressor radially, whereby the inflow chamber comprises an asymmetrical cooling gas supply, and whereby in the inflow chamber means for homogenizing the cooling gas supply to the axial ventilator are provided. In order to improve the cooling, and therefore the efficiency of the machine, the inflow chamber forms a rotation-symmetrical annular chamber in the region of an inflow opening of the channel segment. A cylindrical annular collar is positioned coaxially to the axial ventilator within this annular chamber. The annular collar projects axially into the annular chamber and forms a completely surrounding, radial throttling gap at the inflow opening.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: May 6, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Juergen Baer, Hermann Eichin
  • Patent number: 6558154
    Abstract: A burner system with staged fuel injection includes a burner with a swirl generator (1) for a combustion air stream and device(s) for introducing fuel into the combustion air stream, wherein the fuel introducing devices include at least two separate fuel supply elements (4a, 4b) with groups of fuel outlet openings for corresponding premix fuel amounts, wherein a first group is arranged downstream from a second group. The burner system furthermore includes measurement value probes (8, 9) for measuring the pulsations and emissions of the combustion, as well as a control device (10) that controls the two stages (4a, 4b) for introducing fuel dependent on the measured measuring values. The burner system permits optimized operation of the system even under changing operating and environmental conditions.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: May 6, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Adnan Eroglu, Peter Stuber, Christian Oliver Paschereit, Hans Peter Knoepfel
  • Patent number: 6554061
    Abstract: A recuperative and conductive heat transfer system (10, 10′) that is operative to effect therewith the heating within the second portion (20, 20′) of the heat transfer system (10, 10′) of a “working fluid” flowing through the heat s transfer surfaces (32, 32′) as a consequence of the transfer thereto by conduction of heat from a multiplicity of regenerative solids (24, 24′). The multiplicity of regenerative solids (24, 24′) derive their heat from a recuperation thereby within the first portion (12, 12′) of the heat transfer system (10, 10′) from either an internally generated or an externally generated source of heat (22, 22′).
    Type: Grant
    Filed: December 18, 2000
    Date of Patent: April 29, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Glen D. Jukkola, Paul R. Thibeault, Michael S. McCartney
  • Patent number: 6551386
    Abstract: The invention relates to an oxygen separation device comprising a housing, in which a membrane body separates a first chamber from a second chamber. The membrane body comprises several first channels and several second channels. The channels are arranged in the housing in such a way that their ends on one side of the membrane body are exposed to the first chamber, while their ends on the other side of the membrane body are exposed to the second chamber. In all first channels, the ends exposed to the first chamber are open, and the ends exposed to the second chamber are closed. In all second channels, the ends exposed to the first chamber are closed, and the ends exposed to the second chamber are open. The walls of the channels are formed by an oxygen transport membrane of the membrane body.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: April 22, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventor: Ludwig Weiler
  • Patent number: 6550249
    Abstract: A condenser neck (1) comprises two level cover plates (2) and two side walls (3) located between them that are favorably shaped with respect to flow technology. The cover plates (2) and side walls (3) may be reinforced with ribs (4a,4b). A pipe (5) arranged between the cover plates (2) further reinforces the condenser neck (1). It would also be conceivable to provide openings (11) for bypass lines in the pipe (5) and/or in the side walls (3).
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: April 22, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Daniel Ponca, Vaclav Svoboda, Günter Schmalzbauer
  • Patent number: 6550336
    Abstract: A probe for measuring pressure oscillations includes an inner tube functioning as a measuring tube, an outer tube positioned so as to envelop the measuring tube, a toroidal space open to one side being defined between an outer wall of the measuring tube and an inner wall of the outer tube, a pressure transmitter, which is in connection with the interior of the measuring tube in the area of a transmitter end of the measuring tube, and a semi-infinite tube, which is connected at a first end to the transmitter end of the measuring tube, and which is connected at a second end to the toroidal space. The semi-infinite tube is constructed as a winding positioned around at least one of the measuring tube and the outer tube, thereby providing a compact and robust construction of a probe module, which is suitable especially for continuous use in the measuring of combustor pulsations in gas turbines.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: April 22, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Armin Brehm, Wolfgang Evers, Hugo Wetter, Hanspeter Zinn
  • Patent number: 6546729
    Abstract: The invention relates to a damper arrangement for reducing combustion-chamber pulsations arising inside a gas turbine (1), having a combustion-chamber housing (8) which upstream comprises a front plate (2) with a plurality of individual burners (6) and damping elements (7, 7a, 7b) projecting through the front plate (2) and downstream is connected to a turbine stage (9) and is surrounded by a turbine housing (3) which comprises first openings (5a) which are adapted to the burners (6) and through which the burners (6) project upstream. The invention is characterized in that closable second openings (5b), through which it is possible to insert and tune the damping elements (7, 7a, 7b), are provided inside the turbine housing (9) adjacent to the first openings (5a) adapted to the burners (6).
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: April 15, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Jaan Hellat, Stefan Tschirren, Peter Stuber, Christian Oliver Paschereit
  • Patent number: 6547525
    Abstract: A cooled component, such as a turbine blade for gas turbines is provided, having efficient internal cooling, with an interior cooling passageway having a round cross-section. A row of feeding holes for the coolant are arranged spaced from each other in the direction of the longitudinal axis of the cooling passageway and originating from a common coolant channel. Each of the feeding holes intersects the cooling passageway tangentially. The ease of manufacturing the cooling component is improved in that the majority of the feeding holes have a hole diameter that is smaller than half of the hydraulic diameter of the cooling passageway, and selected feeding holes have a hole diameter that is greater than half of the hydraulic diameter of the cooling channel.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: April 15, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Hartmut Haehnle, Ibrahim El-Nashar, Rudolf Kellerer, Beat Von Arx
  • Patent number: 6533546
    Abstract: An axial/radial three-channel diffuser is provided with two guide vanes for dividing the diffuser into three partial diffusers that are distributed so that the distribution of the surface area over the three partial diffusers in the inlet surface area is uneven. The guide vanes are oriented in accordance with the total pressure field after the last rotating blade row and are arranged at a minimum distance from the trailing edge of the last rotating blade row. Because of its long extension in relation to the channel heights of the partial diffusers, the three-channel diffuser brings about a gentle deflection of the diffuser flow. The diffuser according to the invention results in an improved pressure recovery and increased turbine performance.
    Type: Grant
    Filed: July 31, 2001
    Date of Patent: March 18, 2003
    Assignee: Alstom (Switzerland) Ltd.
    Inventor: Franz Kreitmeier
  • Patent number: 6532744
    Abstract: A gas turbine system comprises a compressor that takes in suction air on the inlet side and compresses it to compressor end air that is available on the outlet side, a combustor in which a fuel is burned by using the compressor end air while resulting in the formation of hot gas, as well as a turbine in which the hot gas is expanded while providing work output. In a method for cooling this gas turbine system, compressed air is removed from the compressor, is fed as cooling air for cooling inside an internal cooling channel through thermally loaded components of the combustor and/or the turbine, is then recooled and subsequently compressed and added to the compressor end air. The influence of the cooling on the efficiency of the system is minimized by the fact that at least part of the compressor end air is used to recool the cooling air.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: March 18, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Wilhelm Reiter, Hans Wettstein
  • Patent number: 6534975
    Abstract: A nondestructive method for determining the thickness of a metallic protective layer determined by detection of a different type of intervening layer which is situated between the metallic protective layer and the metallic base material, by ultrasound, eddy-current or (pulsed) thermography. The intervening layer may comprise a nonmetallic layer of oxides or carbides, a metallic layer of pure nickel or a layer with depleted Al and Ti content in that region of the base material which is close to the surface. This method can be used for turbine blades in order to determine the layer thickness, for example during the test phase of coating, and to avoid the known destruction of the turbine blade, which is labor- and cost-intensive.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: March 18, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventors: Alexander Beeck, Andreas Boegli, John Fernihough, Klaus Schneider
  • Patent number: 6531028
    Abstract: A method for fixing of a ceramic component in a metallic support including a first method step, a bush, consisting of gray cast iron with lamellar graphite, is placed around the ceramic component, in a second method step, the ceramic component including the bush are annealed at temperatures in the range from 500 to 750° C. until the bush has an increase in volume as a result of internal oxidation that causes the ceramic component to be permanently fixed and in that finally, after cooling down, the ceramic component with the bush are introduced into the metallic support and secured in the support.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: March 11, 2003
    Assignee: Alstom (Switzerland) Ltd
    Inventor: Klaus Friedrich Stärk