Abstract: A blade for a gas turbine includes a tip cap and a tip squealer and passages for cooling fluid extending from a hollow space to the tip squealer. The tip squealer includes a cavity extending from the tip pocket into the tip squealer such that the cooling passage is divided into first and second portions with an exit hole in the cavity and an exit hole on the tip crown, respectively. In case of a blockage of the exit hole on the tip crown, cooling fluid can flow through the additional exit hole into the tip pocket and cool the squealer.

Abstract: A casting furnace (1) for producing castings which are directionally solidified in monocrystalline and polycrystalline form. The casting furnace (1) includes an upper heating chamber (2), which is equipped with a heating chamber wall (4) which contains at least one heater element, a lower cooling chamber (3), and contains a casting mold (11) which is moved by means of a conveyor device. Inside the heating chamber (4) there is an internal heater (6) which heats the inner surfaces of the casting pieces (11a), which are shielded from the casting mold (11), and thus prevents the solidification front from sloping inside the casting pieces (11a).

Abstract: The invention gives a process for the control of the amount of cooling air of a gas turbine set (1, 2, 3). Suitable means (32, 33) are provided in the cooling system (26, 27) to enable the amount of cooling air to be varied. The control of this means takes place in dependence on an operating parameter (X). This is determined in a computer unit (22) by suitable combination of measured machine data (p1, p2).

Abstract: A method for manufacturing a welded rotor of a fluid-flow machine are described, through which rotor a coiling medium flows through inflow and outflow passages inside the rotor and which is composed of a plurality of rotor disks, which are connected to one another by welds running radially or largely radially relative to the rotor axis and in each case enclose with one another a hollow passage, which runs around the rotor axis and interrupts the welds in such a way that a weld facing the rotor is directly adjacent to the hollow passage.

Abstract: In a method for operating a combined cycle power plant (15) with at least two power plant units (16A, . . . , 16D), each of which includes a water/steam cycle, an accelerated start-up is achieved in a simple manner by removing a heat-transporting fluid from another operating power plant unit and using it for the preheating and/or maintaining of the heat of individual components of the water/steam cycle in one of the power plant units (16A, . . . , 16D).

Abstract: In a method for operating a matrix converter (10) in which m phases (G1, . . . ,G6) of a source (11) delivering an alternating voltage are alternatingly connected with n phases (L1, . . . ,L3) of a load (12) via a multiple number of controllable bi-directional switches (14) arranged in an (m×n) matrix, an increased performance at decreased expenditure becomes possible in that switching over from a first phase (G1) of the source (11) to a second phase (G1) of the source (11) only takes place if the condition Ik·(Vk−Vl)·Kijkl<0 is met, where Ik and Vk are the current and the voltage of the first phase (G1), Vl is the voltage of the second phase (G1) and in each instance Kijkl is a characteristic constant for the mutual inductance between the phases (G1, . . . ,G6) of the source (11) and the inductance of the load (12).

Abstract: The thermal performance of the heat transfer element assemblies for rotary regenerative air preheaters is enhanced to provide a desired level of heat transfer and pressure drop with a reduced weight. The heat transfer plates in the assemblies have spaced apart dimples for maintaining plate spacing and oblique undulations with the undulations on adjacent plates preferably extending at opposite oblique angles. The dimples may be on every other plate and alternate between the two sides of the plates or they may be on every plate and all extend to the same side.

Abstract: A thermal turbo machine is provided for the attachment of guide vanes on its stationary housing with guide vane carriers with a guide vane platform, from which braces extend towards a band that is suspended in a recess in the stationary housing. In particular, part of the axially adjoining heat shield segments form part of the guide vane platform, and the braces are arranged in a V shape. The braces and the guide vane platform furthermore include a first material, and the band of a second material, whereby the first material has a higher coefficient of expansion than the second material. The guide vane carrier according to the invention has the advantage that the radial blade clearance for the guide vanes and at the same time the radial blade clearance for the rotating blades is minimized for different operating conditions of the turbo machine.

Abstract: The invention relates to a method for producing hot working gases for a gas turbine system. In a burner, combustion that generates hot combustion waste gas takes place. A portion of the combustion waste gas branches off and feeds into an oxygen separation device. A heat exchanger produces a heated oxygen-containing gas from oxygen-containing gas. The heated oxygen-containing gas feeds to the oxygen separation device. The oxygen separation device includes an oxygen separation means that removes oxygen from the heated oxygen-containing gas and feeds it to the branched-off waste gas. Oxygen-reduced hot gas then leaves the oxygen separation device. Oxygen-enriched branched-off waste gas as well as fuel feed to the burner and form a combustion mixture that bums in the burner while forming the hot combustion waste gases. In order to improve the efficiency of the device, the oxygen-enriched branched-off waste gas heats the oxygen-containing gas.

Abstract: An apparatus 100 for providing information concerning a condition of a vessel such as a steam drum 12 which segregates steam and liquid from one another includes a liquid contact assembly 102, a signal generator element 130, and a housing 112 and a conduit 114 for enclosing the signal generator element 130 in a substantially leak proof manner within the vessel space. The liquid contact assembly 102 is disposable at a first vessel location in the steam drum 12 and has a vibration component 108 operable to vibrate at natural frequencies which vary as a function of a predetermined characteristic of the liquid at the first vessel location and a support component 110 for supporting the water contact assembly 102 in contact with the liquid at the first vessel location. The signal generator element 130 generates a signal indicative of a natural frequency of the vibration component 108.

Abstract: A circulating fluidized bed steam generator 10 and a method for operating the circulating fluidized bed steam generator are provided which offer the flexibility to use carbon dioxide (CO2) both as a desirable end product and as support to the combustion process. The method includes the step of introducing a substantially pure oxygen feed stream into the circulating fluidized bed steam generator 10 and the step of combusting a fuel in the presence of the substantially pure oxygen feed stream to produce a flue gas having carbon dioxide and water vapor as its two largest constituent elements by volume. The method also includes the step of passing the flue gas through an oxygen feed stream pre-heater 144 at which heat from the flue gas is transferred to the oxygen feed stream. Furthermore, the method includes the step of separating the flue gas into an end product portion and a recycling portion.

Abstract: A component such as a turbine blade (1) of a gas turbine is provided with an intermetallic felt (2). By providing the tip (11) of the turbine blade (1) with the intermetallic felt (2) and optionally a coating of a ceramic material (3), improved protection against thermal and mechanical effects and improved oxidation resistance can be achieved. Also conceivable would be an arrangement of the intermetallic felt (2) at the rotor (4, 4a) or stator (4, 4b) opposite from the turbine blade (1) or on the platform (12) of the turbine blade (1).

Abstract: A power plant and a method for operating a power plant with a CO2 process is shown. The power plant includes a compressor, a turbine, a generator, a recuperator, and a burner unit with an oxygen separation device and a burner. Oxygen-containing gas, CO2 medium from the CO2 process, and fuel are supplied to the burner unit. The oxygen separation device removes oxygen from the oxygen-containing gas and adds it to the CO2 medium. To improve the efficiency of the burner unit, the burner unit is provided with an additional burner. A portion of the oxygen-enriched CO2 medium as well as fuel is fed to the additional burner. Hot CO2 medium formed by the combustion in the additional burner is mixed with the heated CO2 medium at the input of the oxygen separation device.

Abstract: In a method for setting or regulating the steam temperature of the live steam and/or reheater steam, in particular under part load, in a combined-cycle power plant (22) which comprises a water/steam cycle (20), in particular with a steam turbine (38), with a fired boiler (50) and with means (42, 51) for superheating or reheating the steam generated in the boiler (50) to form live steam or reheater steam, and also a gas turbine set (23) with a downstream heat recovery steam generator (28), the heat recovery steam generator (28) being connected to the water/steam cycle (20) in such a way that steam generated in the heat recovery steam generator (28) is admixed with the live steam or reheater steam, improved part-load behavior is achieved in that the steam temperature of the live steam and/or reheater steam is set or regulated by setting or regulating the steam temperature of the steam generated in the heat recovery steam generator (28).

Abstract: The invention relates to a process for producing hot combustion waste gases (11), in particular for a gas turbine system. In a burner (2), a combustion that produces hot combustion waste gases (11) takes place. A portion (17) of the combustion waste gases (11) is branched off and fed to a first inlet (16) of an oxygen separation device (5). An oxygen-containing gas (20) is fed to a second inlet (23) of the oxygen separation device (5). The oxygen separation device (5) is provided with oxygen separation means (6) that remove oxygen from the oxygen-containing gas (20) and feed it to the branched-off waste gas (17), producing oxygen-containing gas (34) whose oxygen content has been reduced as well as oxygen-enriched, branched-off waste gas (25). The oxygen-enriched, branched-off waste gas (25) as well as a fuel (31) or a fuel/steam mixture are fed to the burner (2) and form a combustion mixture that burns in the burner (2) while forming the hot combustion waste gases (11).

Abstract: A saturated steam generation system is supplemented with at least one gas turbine set, at least one heat recovery steam generator, at least one topping steam turbine and at least one steam mixing component. The topping steam turbine is coupled to the gas turbine set and is supplied by the steam generated in the heat recovery steam generator. The exhaust steam from the topping steam turbine is fed via the steam mixing component to the steam turbine set.

Abstract: A milling method is provided in which a finished part of any desired contour is milled from a blank of any desired contour by the milling tool being guided on a continuous, spiral guide path from the blank continuously to the finished part. In this case, material is continuously removed during the milling operation without ever lifting the tool or clamping the workpiece in place again. This results in a reduced machining time of the workpiece. The continuous, spiral guide path permits a harmonic change of form from the blank to the finished part with smooth guidance of the tool. The method can also be carried out with ceramic tools.

Abstract: In a combustion apparatus (10), in particular for driving gas turbines, in which combustion apparatus (10) a gaseous fuel in a burner (11) is sprayed through a plurality of separate fuel-injection devices (15, 16) into a gas flow containing combustion air, and the resulting mixture flows into a combustion chamber (12) for combustion and burns there, the acoustic impedance or stiffness of the fuel-injection devices (15, 16) is selected to be different in order to avoid thermoacoustic combustion instabilities.

Abstract: In a heat shield (10), in particular for the stator of gas turbines, which heat shield (10) is composed of a plurality of individual segments (10a, b; 20a, b), whose end surfaces (15a, b) respectively abut one another so as to form a gap (12), and which have cooling holes (13a, b) for cooling purposes in the region of the end surfaces (15a, b), through which cooling holes (13a, b) a cooling fluid is blown out into the gap (12), cooling is ensured, even when the gap is closed, by a chamber (11), which is widened relative to the gap (12) and into which the cooling holes (13a, b) open, being arranged in the region of the gap (12).

Abstract: A turbine casing for an axial-throughflow gas turbine surrounds at least one hot-gas space between a compressor stage and a turbine stage and has an outer shell as an external boundary and also an inner shell which is provided separately from the outer shell and which separates the hot-gas space from the outer shell via an annular space. The inner shell is connected to the outer shell via two axial interfaces, in such a way that the annular space is sealed off relative to the hot-gas space. The turbine casing withstands higher compressor final pressures and temperatures and can be produced cost-effectively.