Ansaldo Energia Patente

A thermal barrier fixed to a surface of a material exposed to high temperatures comprising a bond coat layer fixed to the surface of the material to be protected and a thermal insulating ceramic layer fixed to the bond coat layer. The bond coat comprises a first and a second layer distinct from each other and both composed of a MCrAlY+N alloy; wherein M is selected from Ni and Co, and N is selected from the group composed of Re, Ir, Si, Ta and Pt; the first and second layers have a different % by weight of the elements.

A nuclear reactor includes a vessel (2) internally defining a pool (3), a cooling fluid (CF) in the pool (3), and a core (6) housed in the vessel (2) and comprising a plurality of fuel elements (8) at least partially immersed in the cooling fluid (CF) and extending along respective longitudinal axes (A). For each fuel element (8), the nuclear reactor is provided with respective reversible locking members (17), configured to axially constrain adjacent fuel elements (8) to one another and to axially constrain the outermost fuel elements directly or indirectly to the vessel (2), so as to prevent the extraction of the constrained fuel elements (8). The nuclear reactor is further provided with axial adjustment devices (30, 40) configured to adjust an axial distance between respective fuel elements (8) and the respective locking members (17).

A gas turbine engine includes a compressor (2), a combustor (3), a turbine (5), a primary supply system (6) supplying a primary fuel (F1) containing ammonia, a secondary supply system (7) supplying a secondary flow (F2) containing air and/or a fuel, and a control system (8). The combustor (3) includes a combustion chamber (12), a plurality of burner assemblies (10), each having a respective reaction zone (Zt) inside the combustion chamber (12), and a plurality of injectors (11), configured to inject the secondary fluid (F2) downstream of the reaction zones (Zt) of the burner assemblies (10). The control system (8) is configured to control the primary supply system (6) so that the burner assemblies (10) transform a first mixture having a first fuel-air equivalence ratio (ϕ1) greater than 1 in the reaction zone (Zt) and to control the primary supply system (6) so that the injectors (11) inject the secondary fluid (F2) into the combustion chamber (12) with a second fuel-air equivalence ratio (ϕ2) lower than 1.

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A maintenance method for a gas turbine electric power plant (1) involves replacing the thrust ring (29, 38; 30) of a bearing assembly (16) arranged about a shaft (8) of the plant (1) with a spare thrust ring having a different thickness (NR), intended as the axial length between a thrust face (51) and at least one abutting face (53) of the wall (50) of the thrust ring (29, 38; 30).

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A portable inspection-aid tool for aiding inspection of combustion chambers of gas turbines includes: a frame (2), internally delimiting an inspection window (8); an image-capture assembly (3), connected to the frame (2) and oriented to capture images through the inspection window (8); a plurality of light sources (18) attached to an inner surface of the frame (2) around the inspection window (8) and configured to directionally emit light in accordance with a dark-field illumination pattern out of the inspection window (8) and away from the image-capture assembly (3); an on-board control unit (5), configured to selectively activate the light sources (18) and to synchronize image-capture of the image-capture assembly (3) with activation of the light sources (18); and a hand-hold portion (7) for hold by a user.

An inspecting device for inspecting a wedge surface (16) of a wedge (15) for fixing a stator bar (11) of a generator (7), in particular for measuring the deflection of the wedge surface (16); wherein the generator has an axis (2) and comprises a in inner rotor (6) and an outer statoric part (8) provided with a plurality of axial groove (10) for housing in a recessed position statoric bars (11) kept in position by wedges (15), an airgap (12) being present between the inner rotor (6) and the outer statoric part (8); the inspecting device comprises a vehicle (19) having a size suitable for being inserted in the generator air gap (12) in presence of the rotor (6) and for axially running along the rotor axis (2) facing the wedge surface (16) to be measured; the vehicle (19) being provided with a contactless sensor device configured for inspecting the wedge surface.

A Gas turbine assembly comprises: • a compressor (3) configured to compress air; the compressor (3) extending along a longitudinal axis and being provided with an outlet diffuser (26) and with a compressor casing (9a); • a plenum (30), which is a closed volume delimited at least by an outer casing (31) coupled to the compressor casing (9a) and by the outlet diffuser (26); the outlet diffuser (26) being designed to discharge the compressed air into the plenum (30); • a combustor (4) partially arranged in the plenum (30); • at least one pressure sensor (7; 7a; 7b; 7c) facing an area of the plenum (30) comprised between the outer casing (31) and the outlet diffuser (26).

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A device for inspecting a combustor comprising: a sensing probe (22); an arm (23) having one first end (24) coupled to the sensing probe (22) and one second end (25) coupled to a base (26); the arm (23) comprising a plurality of modules (27) coupled to one another; each module (27) being coupled to the adjacent module (27) with a respective rotational joint (28); each rotational joint (28) being independently controlled.

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A method for controlling the positioning of at least one rotor disc (2) about a tie-rod (3) of a partially assembled rotor (1) of a gas turbine comprises:• positioning the tie-rod (3) so as its longitudinal axis (A) extends substantially vertically;• detecting the eccentricity of the rotor disc (2) with respect to the longitudinal axis (A) of the tie-rod by means of an assembly (23) comprising a main device (24) coupled to a free face (13a) of the rotor disc (2) and at least one first reference device (25, 26) coupled to the tie-rod (3); the assembly (23) further comprising at least three lasers emitters (28) coupled to one between the main device (24) and the at least one first reference device (25, 26) and at least three respective photosensitive sensors (30) coupled to the other between the main device (24) and the at least one first reference device (25, 26); the photosensitive sensors (30) being arranged so as to intercept laser beams (B) emitted by respective lasers emitters (28).

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A method for cleaning the end outer surface of a generator conductor, in particular a turbo-generator conductor, wherein the conductor is a cylindrical conductor coupled to a first stator bar joint of the a generator; the method comprising the steps of: a) providing a portable device provided with a grinding tool; b) releasing the coupling between the first stator bar joint and the conductor; c) coupling the grinding device to the conductor, the conductor being still coupled to the generator; d) grinding the end outer surface of the conductor.