Abstract: In a method for operating a gas turbine (GT) with sequential combustion, which has at least one compressor (12, 13), a first combustion chamber (14) with a first turbine (15) which is connected downstream, and a second combustion chamber (16) with a second turbine (17) which is connected downstream, the at least one compressor (12, 13) draws in air and compresses it. The compressed air is fed to the first combustion chamber (14) for combusting a first fuel, and the gas which issues from the first turbine (15) is fed to the second combustion chamber (16) for combusting a second fuel. Increased flexibility and safety in operation is achieved by different fuels being used as first and second fuel.

Abstract: A method of protecting a NOx reducing catalyst 140 from fouling, where the NOx reducing catalyst 140 is downstream of a circulating fluidized bed (CFB) boiler 120 and upstream of a particulate removal device 150. The method includes introducing a SOx removing reagent 212 in a calcium to sulfur molar ratio greater than that required for SO2 removal from a flue gas 122 generated by a CFB 120, thereby preventing SO3 formation and fouling of the NOx reducing catalyst 140.

Abstract: Described is a cooling passage arrangement inside a hollow-cast cast part, with a flow region, delimited by at least two spaced apart cast-part walls, for a cooling medium (K), which flow region is divided in the flow direction into two cooling passages (7) by at least one rib line (6) which is connected to the two cast-part walls. The invention is characterized in that provision is made along the at least one rib line (6) for at least one gap (13), at which two rib ends (61, 62) are oppositely disposed a distance apart, of which one rib end has a contour in the style of a “wish bone -“Y”-cross-section” (14).

Abstract: A transition duct having a panel assembly with an inlet end of generally circular cross section and an outlet end having a generally rectangular arc-like cross section is disclosed. The panel assembly has an uncoated internal profile substantially in accordance with coordinate values X, Y, and Z as set forth in Table 1. The coordinates are taken at a sweep angle ? wherein ? is an angle measured from the inlet end and X, Y, and Z are coordinates define the panel assembly profile at each angle ?. An alternate embodiment of the invention defines an envelope for the uncoated internal profile of the panel assembly.

Abstract: The invention relates to a method of removing carbon dioxide from a process gas, the method comprising: a) allowing an ammoniated solution to enter an absorption arrangement, said absorption arrangement comprising at least a first absorber; b) contacting the ammoniated solution with the process gas in said first absorber, the ammoniated solution capturing at least a part of the carbon dioxide of the process gas; c) allowing the ammoniated solution to exit the absorption arrangement; d) cooling the ammoniated solution, wherein at least a part of the captured carbon dioxide is precipitated as solid salt; e) allowing the cooled ammoniated solution to enter a separator, in which separator at least a part of the precipitated solids are removed from the ammoniated solution, after which the ammoniated solution is allowed to exit the separator; f) heating the ammoniated solution; and g) allowing the heated ammoniated solution to re-enter the absorption arrangement.

Abstract: A rotary air preheater 10 includes a housing 12 having a rotor 14. The rotor 14 has opposing ends 20,24 and is divided into sections by diaphragms 48. Sector plates 28 include one sector plate 28 in sealing relation with one of opposing ends 20,24 of the rotor 14. The air preheater 10 includes a flange 56 and a sensing device 49 coupled to at least one of the sector plates 28. The sensing device 49 provides non-contact sensing of a distance between the sector plate 28 and the flange 56. The sensing device 49 includes a conduit 54 that directs a jet of compressed air onto the flange 56, a first pressure sensor 60 and a second pressure sensor 70. The first pressure sensor 60 senses pressure inside the sensing device 49, and the second pressure sensor 70 senses pressure outside the sensing device 49. The distance between the sector plate and the flange is a pressure difference measured by the first and the second pressure sensors 60,70.

Abstract: A turbine blade is provided having an airfoil and a platform manufactured in two separate pieces, which are joined together. The blade includes a seal, which is a mechanically decoupled seal, interposed between the airfoil and platform in a position closer to a hot gases path than a joint.

Abstract: A gas turbine is provided including a compressor, a combustion chamber, a guide vane row and a rotor airfoil row. The guide vane row includes a plurality of guide vane airfoils having a blade and an inner platform. The ratio between the pitch and the leading edge diameter of the guide vane airfoils is between 6.3-7.6 and the ratio between the platform length and the leading edge diameter of the guide vane airfoils is between 4.0-5.5.

Abstract: A burner arrangement is provided including a swirl-generating premix burner for providing a fuel/air mixture produced with a first fuel as well as a mixing pipe adjoining the premix burner downstream thereof and extending into a combustion chamber. In the case of such a burner arrangement, safer operation with highly reactive, in particular H2-rich fuel is achieved by the mixing pipe having a constriction downstream of the outlet of the swirl generator, and by a feeder for spraying in the highly reactive, in particular H2-rich fuel being arranged at the level of the constriction.

Abstract: A method for producing hot gas for operating a turbomachine fired with at least one combustion chamber includes premixing a fuel with a plurality of operating gases by introducing fuel into the plurality of operating gases in a mixing chamber disposed upstream of the combustion chamber using a burner arrangement, wherein the fuel includes at least one of a combustible gas and a H2-rich fuel; and introducing the premixed fuel into the combustion chamber.

Abstract: A blade is provided for a gas turbine, especially for the low-pressure turbine of a gas turbine with sequential combustion, and is produced in accordance with a casting process and has a blade airfoil which extends in the radial direction between an inner platform and an outer platform, and in the interior of which extends a cooling passage, bypassing the platforms, and through which flows a cooling medium, especially cooling air, for cooling the blade. In the outer and/or inner platform there are core outlet openings which arise from the use of a casting core and which connect the cooling passage to the outside space and are sealed off by means of a sealing element. Optimum cooling is ensured by the sealing elements being formed and inserted into the core outlet openings so that they align with the wall surface of the cooling passage in a flush manner.

Abstract: A hollow-cast casting is provided, which includes at least one core opening that is caused by the production technique and which has a closure device that closes the core opening. The closure device can be inserted into the core opening axially in relation to the core opening and provides at least one surface region which, in axial projection in relation to the core opening, can be made to abut a surface region of the casting that is facing toward the casting. The surface region lies radially outside a cross-sectional area predetermined by the core opening.

Abstract: Power plant characteristics are operated in a flexible manner by controlling the power consumption of a CO2 capture and compression system. The impact of CO2 capture and compression on the capacity of a power plant can be minimized to maximize the electric power the plant can deliver to the power grid and the impact of CO2 capture and compression on the average plant efficiency can be reduced, by an operating method and a power plant, in which the power consumption of the CO2 capture system is used to control the net output of the plant.

Abstract: A combustion chamber (1), in particular in a gas turbine, has at least two burners (A-H) that are connected to a fuel supply (3) via controllable fuel valves (2? and 2). Each burner (A to H) is assigned at least one optical measuring device (4) for detecting chemiluminescent radiation, and the combustion chamber (1) is assigned a pressure sensor (7) for detecting a combustion chamber pressure. The optical measuring device (4) and the pressure sensor (7) are connected to a computing and control device, which calculates a correlation value from the incoming measured values. A high correlation value signifies that the associated burner is prone to pulsation. The computing and control device (6) is designed in such a way that it determines the burner or a burner group with the highest correlation and controls the associated fuel valve(s) in such a way that more fuel is fed to the respective burner or the respective burner group, and the pulsation tendency thereof is thereby reduced.

Abstract: A recuperative air storage plant comprising a gas turbine set and a heat exchanger. In the heat exchanger, exhaust gas heat from the gas turbine set can be transferred to a pressurized stored fluid which flows from a storage volume to a expansion machine. A flow junction with an exhaust gas damper which can be operated in a plurality of positions is arranged in the exhaust gas path of the gas turbine set, upstream of the heat exchanger. This exhaust gas damper makes it possible to divide the exhaust gas mass flow (m0) of the gas turbine set in a variable fashion between a stack and the heat exchanger. In this way it is possible to operate the gas turbine set quickly at high power in the electric power network independently of the heat exchanger and the expansion machine, while the thermal load of the air storage part is slowly increased by incrementally increasing the exhaust gas proportion (m1) which flows to the heat exchanger.

Abstract: A static exciter of a field winding includes a rectifier connected to an electric grid and to the field winding; a unidirectional electronic switch connected in series with the rectifier; a capacitor bank; and a further switch disposed between the unidirectional electronic switch and the capacitor bank. Exciter also includes a control unit connected to the further switch and configured to close the further switch when a grid voltage drops below a first prefixed voltage value so as to connect the capacitor bank to the field winding and configured to open the further switch when the grid voltage exceeds a second prefixed voltage value so as to disconnect the capacitor bank from the field winding and so as to supply energy to the field winding from the capacitor bank for a time period.

Abstract: A combustion device for a gas turbine that includes a portion having first and second walls that defines an inside of the combustion device, a zone between the first and second walls and an outside of the combustion device. A plurality of first passages connect the inside of the combustion device to the zone between the first and second walls and a plurality of second passages connect the zone between the first and second walls to the outside of the combustion device. A plurality of chambers are defined within the zone between the first and second walls, each chamber being connected with one first passage and at least one second passage. Each chamber defining a Helmholtz damper.

Abstract: A power plant frequency response characteristic is implemented by controlling the power consumption of a CO2 capture and compression system. A power reserve is provided for under-frequency events without deloading the plant to part load, by an operating method, in which the power consumption of the CO2 capture system is used to control the net output of the plant.

Abstract: A method and system for reducing an amount of ammonia in a flue gas stream. The system 100 includes: a wash vessel 180 for receiving an ammonia-containing flue gas stream 170, the wash vessel 180 including a first absorption stage 181a and a second absorption stage 181b, each of the first absorption stage 181a and the second absorption stage 181b having a mass transfer device 184; and a liquid 187 introduced to the wash vessel 180, the liquid 187 for absorbing ammonia from the ammonia-containing flue gas stream 170 thereby forming an ammonia-rich liquid 192 and a reduced ammonia containing flue gas stream 190 exiting the wash vessel 180.

Abstract: A heat recovery steam generator (“HRSG”) 40, which is closely coupled to a gas turbine, includes a flow controls structural array 10 disposed upstream of the tubes 42 of the HRSG 40. The structural array 10 is formed of a plurality of grate-like panels 18 secured to horizontal supports 24 mounted to the support structure of the HRSG 40. The structural array 10 diffuses the high velocity exhaust stream 14 exiting the gas turbine and redistributes the gas flow evenly throughout the HRSG 40. The structural array 10 reduces wear and damage of the tubes 46.