Abstract: The present invention discloses various methods for repairing a side seal region of a transition duct aft frame region. Embodiments of the present invention include application of a braze filler material to worn locations of seal teeth, brazing of a braze preform to the seal teeth or removal of a worn seal tooth and brazing of material compatible with the transition duct to form a replacement tooth of the side seal. The transition duct is brazed in a furnace in an incremental heated process which elevates the transition duct to a temperature where the braze filler material adheres to the side seal region while also providing a stress relief to the transition duct.

Abstract: The disclosure relates to a method for the scheduling and/or the operation of a system of at least two power supplies (11) providing DC pulses to a consumer (5), typically an electrostatic precipitator, wherein the power supplies (11) are energized by a common feeding (1). According to the proposed method one power supply (11) is defined to be the reference power supply, and the initial pulses of each further power supply (11) are shifted by controlled delays (?Pri) with respect to the pulses of the reference power supply so as to fill the gaps between the pulses of the reference power supply by the pulses of the further power supplies (11).

Abstract: A compensations duct assembly [100] is described that provides a gas tight connection between a backpass [9] of a furnace [3] and an air preheater pipe [10] having one end fixed relative to a floor. The compensation duct assembly [100] has an air preheater opening [133] that is connected to an air preheater duct [10]. A liquid seal [120] is employed to compensate for the movement due to thermal expansion between the backpass [9] and the compensation duct assembly [100]. The liquid seal [120] provides a gas tight connection under various conditions of thermal expansion.

Abstract: A system and method for controlling oxidation of sulfites in a slurry. The system includes a tank having an inlet for receiving a slurry used in wet flue gas desulfurization. The tank also includes an inlet for receiving a gas. The inlet for receiving the gas is configured so that at least a portion of the gas received in the tank is dispersed through at least a portion of the slurry received in the tank. A sensor is configured to measure a sulfite concentration S1 of the slurry received in the tank. In some embodiments, the sensor is a sulfite analyzer. In other embodiments, the sensor is a virtual analyzer. The system includes a controller. Software executing on the controller generates a signal indicative of an adjustment of a flow rate of gas into the tank based at least in part on the sulfite concentration S1.

Abstract: A turbo machine, especially gas turbine, comprises a rotor, which rotates about a horizontal machine axis, and which is enclosed by a coaxial enclosure comprising a metal casing, whereby an electrical heating system is provided on the lower half of said metal casing. A safe operation is achieved by having said heating system configured as a redundant system.

Abstract: A system and method for recovering a solvent from a decarbonated flue gas in an absorption column, the decarbonated flue gas having had carbon dioxide absorbed and removed by vapor-liquid contact with a carbon dioxide absorbing solution containing the solvent. The system includes an emission control section configured to bring a water stream substantially free of the solvent into contact with the decarbonated flue gas to recover the solvent from the decarbonated flue gas and to form a solvent containing wash water and a reduced solvent containing flue gas and a flue gas cooling section configured to bring cooled wash water into contact with the reduced solvent containing flue gas to cool the reduced solvent containing flue gas and condense water from the decarbonated flue gas thereby forming a cooled flue gas and used wash water.

Abstract: A blade for a rotor of a turbine includes an airfoil, a shroud and a platform. The platform includes a top plate, a shank and a fixing part. An upstream wall projects in the circumferential direction away from the shank and extends from the top plate toward the fixing part, the upstream wall at least partially covering an upstream side of the shank. A downstream wall projects in the circumferential direction away from the shank and extends from the top plate toward the fixing part, the downstream wall at least partially covering a downstream side of the shank. A recess is disposed in at least one of the upstream wall and the downstream wall. The recess has an open side facing in a same direction as a respective one of the upstream wall and the downstream wall, in which the recess is disposed, is projecting.

Abstract: An axial flow turbine is described having a casing defining a flow path for a working fluid therein, a rotor co-axial to the casing, a plurality of stages, each including a stationary row of vanes circumferentially mounted on the casing a rotating row blades, circumferentially mounted on the rotor, with within a stage n vanes have an extension such that at least a part of the trailing edge of each of the n vanes reaches into the annular space defined by the trailing edges of the remaining N-n vanes and the leading edges of rotating blades of the same stage.

Abstract: The invention relates to a method for operating a thermal power plant, which includes a gas turbine and a generator driven directly by the gas turbine by means of a shaft and being connected to an electrical grid having a grid frequency (FG) via an electronic decoupling apparatus and a step-up transformer. A synthetic inertia response is achieved by said method includes the steps of: sensing said grid frequency (FG); detecting if in case of an excursion of said grid frequency (FG) additional inertial power is required or not; if inertial power is required, calculating the magnitude and duration of the additional inertial power; and releasing additional inertial power to said electrical grid in accordance with said calculations via said electronic decoupling apparatus.

Abstract: A voltage source converter includes three branches connected at a first end to a junction to form a star configuration, the second end of each branch defining a DC terminal, the second ends of the second and third branches being connectable to a first DC voltage, and the second ends of the first and second branches being connectable to a second DC voltage. The first and second branches include primary switching elements, and the third branch includes a primary inductive element. The converter includes a converter limb connected in parallel with one of the first and second branches, the converter limb including a chain-link auxiliary converter including multiple series-connected modules controllable to selectively provide a voltage source to modify a branch voltage across the branch connected in parallel with the converter limb, each module including at least one secondary switching element and at least one energy storage device.

Abstract: Methods are provided for creating dynamic lists from selected areas of a power system of a utility company. The utility company has an energy management system with a control panel. The energy management system is used to access one or more source displays of a site. Rubber-banding or lassoing is used to create selected areas from at least a portion of the source displays. Lists are dynamically created. Operator defined information is displayed for each element type in a list of network elements from the selected areas that have been rubber-banded or lassoed.

Abstract: The invention relates to a steam turbine governing system for maintaining synchronization between an electrical grid and an electric generator, driven by a steam turbine, after the occurrence of a grid short circuit at the electrical grid. The governing system includes a governor adapted to control an arrangement of valves for regulating the steam flow in the steam turbine and means for measuring the voltage drop at the output of the electric generator. The governing system further includes means for measuring the electric power drop at the output of the electric generator. The governor is adapted to initiate operation of the arrangement of valves of the steam turbine in response to a voltage drop exceeding a predetermined value and to an electric power drop exceeding a predetermined value.

Abstract: The invention relates to a sealing segment for sealing between a stationary component and a rotating component. The sealing segment having a passage that extends so as to enable pressure balancing between radial ends of the sealing segment so by providing a seal that can ensure a minimum seal distance is maintained without the need for the complexities of actuators or other mechanical devices.

Abstract: The invention relates to a sealing system for sealing between a first component and a second component wherein at least one or either the first component or the second component is a rotating component. The first component has a circumferential groove in which a sealing segment has first and fifth end portions adjacent the groove and second, third and fourth portions that form a U shape that mirrors the shape of and extends into the circumferential groove.

Abstract: A method for filtration of harmful gas effluents from an industrial installation including the steps of providing a gas effluent from an industrial installation, the gas effluent including a mixture of gases; filtering the harmful, elements from the gas effluent by membrane separation through a plurality of membranes, the membrane separation being achieved by sifting, sorption and/or diffusion, each membrane being adapted for filtering a specific harmful element; sorting the filtered harmful elements and storing them in separate storage reservoirs, and discharging the processed gas effluent to the atmosphere.

Abstract: A method is disclosed for operating a gas turbine power plant having a gas turbine, a heat recovery steam generator and an flue gas splitter which splits flue gases into a first flue gas flow for recirculation into an inlet flow of the gas turbine and into a second flue gas flow for discharge to an environment. An oxygen-depleted gas can be used in an open cooling system for cooling hot gas parts of the gas turbine. A split compressor intake can be provided for separate feed of recirculated flue gas and fresh air into a compressor intake. Compressor blades can include a separating band which blocks intermixing of recirculated flue gas and fresh air during compression.

Abstract: A component or coupon for use in a thermal machine under extreme thermal and mechanical conditions comprises an alloy material having a controllable grain size (d). A grain size distribution (d(X,Y,Z)) of the component or coupon corresponds to at least one of an expected temperature distribution (T(X,Y,Z)), an expected stress distribution (?(X,Y,Z)) and an expected strain distribution (?(X,Y,Z)), which vary with geometrical coordinates (X,Y,Z) of the component or coupon, such that a lifetime of the component or coupon is improved with respect to a similar component or coupon having a substantially uniform grain size.

Abstract: The present disclosure provides an improved first stage airfoil for a compressor blade having a unique chord length (CD), stagger angle (?) and camber angle (??). The stagger angle (?) and camber angle (??) provide improved aerodynamics while the chord length (CD) provides for reduced airfoil weight.

Abstract: An inspection vehicle for inspecting a substantially cylindrical object composed of a magnetizable material includes a chassis. A plurality of wheels is disposed on the chassis so as to be rotatable and is configured to move the chassis in a circumferential direction along an external surface of the cylindrical object, at least some of the plurality of wheels being motor-drivable. The plurality of wheels is disposed so as to provide a chassis clearance allowing a movement of the chassis over an obstruction on the external surface of the cylindrical object. A magnetic device is disposed on the chassis and is configured to hold the vehicle on the external surface of the cylindrical object.

Abstract: A spray dryer absorber operative for removing gaseous pollutants from a hot process flue gas and a vibrator device for removing accumulated deposits therefrom is provided. The spray dryer absorber includes a spray dryer chamber equipped with a plurality of dispersers and atomizers mounted at a roof of the spray dryer chamber. The vibrator device is operative to remove accumulated deposits from the spray dryer absorber and its components, such as its dispersers and atomizers, to avoid spray dryer absorber performance interference caused by such deposit accumulations.