General Electric Technology Patente

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A design for an effectively cooling a liner (7) of a gas turbine combustor by means of convective cooling is disclosed.

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A turbine blade (12) of a gas turbine comprises a radially extending airfoil (29) with a suction side (26) and pressure side (27), which extend each in axial direction between a leading edge (24) and a trailing edge of said airfoil (29), whereby said leading edge (24) is cooled by means of impingement cooling with rows of radially distributed jets of a cooling medium impinging on the inner side of said leading edge (24), and whereby said row of radially distributed jets is generated at an internal web (16), which divides the hollow interior of the airfoil (29) into first and second cavities (15, 17), with the second cavity (17) being arranged at said leading edge (24). An enhanced cooling is achieved by said internal web (16) comprising two rows of radially distributed cooling medium supply holes (18, 19), through which cooling medium enters said second cavity (17) in form of impinging jets, whereby said cooling medium supply holes (18, 19) are oriented such that the directions of said jets of one row cross the directions of said jets of the other row.

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In the field of high voltage direct current (HVDC) electrical networks there is a need to clear various faults which may arise from time to time. A method of clearing a fault in a high voltage DC electrical network (10; 80), which includes at least three power converters (12, 14, 16, 18) that are interconnected by at least a first DC power transmission medium (20), comprises the steps of: (a) detecting a fault (68; 72) in the first DC power transmission medium (20) and in response reconfiguring each power converter (12, 14, 16, 18) from a normal power transmission mode to a fault blocking mode to drive the resulting DC fault current (I Fault ) flowing in the first DC power transmission medium (20) towards zero; (b) locating the fault (68; 72) in the first DC power transmission medium (20) and isolating a faulty portion (62) of the first DC power transmission medium (20) from a healthy remaining portion (64) of the first DC power transmission medium (20); (c) reconfiguring at least one of the power converters (12, 14, 16, 18) designated as a re-energising power converter (66) from the fault blocking mode to a reenergising mode to re-energise the healthy remaining portion (64) of the first DC power transmission medium (20); and (d) detecting a rise in the voltage level in the healthy remaining portion (64) of the first DC power transmission medium (20) above a first threshold level and in response reconfiguring the or each remaining power converter (12, 14, 16, 18) connected with the healthy remaining portion (64) of the first DC power transmission medium (20) from the fault blocking mode to the normal power transmission mode.

A voltage source converter (30) comprises: first and second DC terminals (32,34) for connection to a DC electrical network (44); and a converter limb (36) directly connected between the first and second DC terminals (32,34), the converter limb (36) including: an AC terminal (42) for connection to an AC electrical network (46); a first limb portion (38) directly connected between the first DC terminal (32) and the AC terminal (42); and a second limb portion (40) directly connected between the second DC terminal (34) and the AC terminal (42), wherein only one of the first and second limb portions (38,40) includes a multilevel converter block (52), the other of the first and second limb portions (38,40) includes a switching block (48), the switching block (48) is switchable to selectively permit current flow in at least one direction in the corresponding limb portion (38) and inhibit current flow in at least one direction in the corresponding limb portion (38), and at least one of the first and second limb portions (38,40) is controllable to control the configuration of an AC voltage waveform at the AC terminal (42).

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Turbine part replacing apparatus for moving a combustor (1) of an industrial gas turbine from and to a mounting port of the gas turbine, the apparatus comprising a mobile frame (101) with a moving mechanism (112, 114) for substantially horizontal translation motion on the ground, a vertically extendable arm (120) attached to and extending from said mobile frame (101), and a carriage (15) attached to said extendable arm (120) such that the carriage (15) may be moved vertically with respect to the mobile frame (101). Moreover, the turbine part replacing apparatus is adapted for receiving said combustor (1) in said carriage (15) and for vertically moving said received combustor (1) by means of said extendable arm (120) from and to the mounting port.

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The invention concerns a sequential liner (10) for a gas turbine combustor, comprising a sequential liner outer wall (12) spaced apart from a sequential liner inner wall (22) to define a sequential liner cooling channel between the sequential liner outer wall (12) and the sequential liner inner wall (22). The sequential liner outer wall (12) comprises a first face (14), a first adjacent face (16) and a second adjacent face (16), the first (16) and second (16) adjacent faces each being adjacent to the first face (14), the first face (14) of the sequential liner outer wall (12) comprising a first convective cooling hole (18) adjacent to the first adjacent face (16) and a second convective cooling hole (18) adjacent to the second adjacent face (16), each convective cooling hole (18) being arranged to direct a convective cooling flow into the sequential liner cooling channel adjacent to each adjacent face (16). The invention also concerns a method of cooling using the sequential liner (10) and a method of retrofitting a gas turbine.

A solar receiver configuration (receiver) adapted to include a plurality of receiver heat transfer passes. Each pass includes a plurality of panels. Further, each panel includes a plurality of tubes, tangentially arranged, vertically extending between horizontally placed lower and upper headers. The headers, which are pipe assemblies with closed ends, of adjacent panels are horizontally and vertically offset one to another to form a substantially continuous tube surface. Such continuous tube surface enables solar heating of the fluid flow therefrom in at least a parallel flow arrangement and a serpentine flow arrangement.

The present disclosure relates to a method of milling a fuel for an oxy-fuel combustion burner (9), the method comprising: separating air into a hot nitrogen gas stream, having a temperature of at least 150°C and a purity of at least 98 mol-% nitrogen, and an oxygen gas stream; leading at least a part of the nitrogen gas stream to a fuel mill (2); milling the fuel by means of the fuel mill (2) in a nitrogen rich atmosphere formed by means of the nitrogen gas stream; leading the at least a part of the nitrogen gas stream away from the milled fuel; leading the oxygen gas stream to the oxy-fuel combustion burner (9); conveying the milled fuel to the oxy-fuel combustion burner (9); and burning the fuel, by means of the oxy-fuel combustion burner (9), in an oxygen rich atmosphere formed by means of the oxygen gas stream. The present disclosure further relates to a system for milling a fuel for an oxy-fuel combustion burner as well as to a power plant comprising such a system.

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