Abstract: Provided is a control device of a gas turbine including a compressor, a combustor, and a turbine. The control device executes load control of allowing an operation control point for operation control of a gas turbine to vary in response to a load of the gas turbine. The operation of the gas turbine is controlled on the basis of a rated temperature adjustment line for temperature adjustment control of a flue gas temperature at a predetermined load to a rated flue gas temperature at which performance of the gas turbine becomes rated performance, a preceding setting line for setting of the flue gas temperature at the predetermined load to a preceding flue gas temperature that becomes lower in precedence to the rated flue gas temperature, and a limit temperature adjustment line for temperature adjustment control.

Abstract: A gas turbine cooling system includes: a cooling air line that guides compressed air; a cooler that cools the compressed air; a flow rate adjuster that adjusts the flow rate of the cooling air; and a control device. The control device includes: a load change determination unit that determines whether a load indicated by a load command of the gas turbine has changed; a first command generation section that generates a first command indicating such an operation amount of the flow rate adjuster as allows the flow rate of the cooling air to meet a target flow rate; and a second command generation section that, when it is determined that the load indicated by the load command has changed, generates a second command indicating such an operation amount of the flow rate adjuster as allows a change-adapted flow rate higher than the target flow rate to be met.

Abstract: A system is disclosed provided with: a slag bath that retains slag cooling water and receives slag; a slag cooling water feed line and a slag pump outlet via which the slag and the slag cooling water are pumped and fed to a slag separation device; a circulation pump that forms a water flow for pumping out the slag; a slag cooling water circulation line linking from the slag separation device to the slag bath; a reverse flow line that causes the slag cooling water dispensed from the circulation pump to flow in reverse in the slag cooling water feed line; a selective supply unit capable of selectively supplying the slag cooling water dispensed from the circulation pump to the slag cooling water circulation line and the reverse flow line; and a water supply line, one end of which is connected to the slag cooling water feed line.

Abstract: A rotor shaft has: an inlet flow passage through which gas inside a gas compression flow passage flows into an outer cavity of a downstream-side cavity group; a radial flow passage that provides communication between the outer cavity and an axial communication cavity of the downstream-side cavity group; an axial flow passage that provides communication between the axial communication cavity of the downstream-side cavity group and the axial communication cavity of an upstream-side cavity group; another radial flow passage that provides communication between the axial communication cavity and the outer cavity of the upstream-side cavity group; and an outlet flow passage through which the gas inside the outer cavity of the upstream-side cavity group flows out into the gas compression flow passage.

Abstract: There is provided a seal structure to suppress a leak flow of a working fluid from a gap between a rotating structure and a stationary structure, the rotating structure being configured to rotate in a prescribed direction about an axial center line, the stationary structure facing an outer periphery of the rotating structure in a radial direction with the gap inbetween, wherein the stationary structure has a cavity in which the rotating structure is accommodated, an inner peripheral surface of the cavity is provided with a seal fin that extends toward the axial center line and a plurality of stationary-side recesses arranged along a flow direction of the leak flow, and as compared with a first stationary-side recess disposed on a most upstream side, a second stationary-side recess disposed on an immediately downstream side of the first stationary-side recess is set to have a smaller depth dimension.

Abstract: A steam turbine blade includes a blade body (7) including blade surfaces (70) extending in a blade height direction. The blade body (7) includes a first suction port (74) extending in the blade height direction and opening in the blade surface (70), a first drain flow path (75) internally extending in the blade height direction, and first communication passages (76) internally provided away from one another in the blade height direction and independently of one another and making the first drain port (74) and the first drain flow path (75) in communication with each other.

Abstract: A cylinder for a combustor includes a cylindrical member, a first cooling passage defined in the cylindrical member and a second cooling passage defined in the cylindrical member, and a supply port extender. The first cooling passage includes a supply port that opens to an outer peripheral surface of the cylindrical member. The second cooling passage includes a discharge port that opens to the outer peripheral surface of the cylindrical member downstream of the supply port. The supply port extender includes a first wall that is disposed between the supply port and the discharge port and extends away from the outer peripheral surface of the cylindrical member and a second wall that is disposed upstream of the supply port and extends away from the outer peripheral surface of the cylindrical member.

Abstract: An object of the present invention is to easily remove last-stage turbine blades. Provided is an exhaust chamber inlet-side member that has an annular shape around a rotor so as to form a part of an inner diffuser at a position facing, from the axially downstream side, base ends of last-stage turbine blades disposed on the most downstream side in the axial direction, and that is divided in the circumferential direction and provided so as to be detachable from the inner diffuser. When the exhaust chamber inlet-side member is dismounted from the inner diffuser, a space on the axially downstream side from the last-stage turbine blades is cleared.

Abstract: A seal device for a turbine includes: a plurality of thin plates arranged along an outer peripheral surface of the rotor, each of the thin plates including a root portion disposed on an outer side in a radial direction of the rotor and supported on a stationary part of the turbine and a tip portion disposed on an inner side in the radial direction of the rotor and having a tip surface facing the outer peripheral surface of the rotor. Each of the thin plates is configured such that a width direction of the thin plate is parallel to an axial direction of the rotor at a side of the root portion, and the tip portion of each of the thin plates is configured such that an end on a side of the high-pressure space is positioned downstream of another end on a side of the low-pressure side.

Abstract: A method of welding erosion resistance metallic material is a method of welding erosion resistance metallic material to a base element (1) of a turbine blade leading edge portion (1A). The method includes the steps of: forming a curved surface in the leading edge portion (1A) to which the erosion resistance metallic material is applied so that a radius R of the curved surface is larger than thickness t of the base element (1); and welding the erosion resistance metallic material to the leading edge portion (1A).

Abstract: The present invention aims to provide sintered materials of austenite steel powder each having a strength which is equivalent to or in excess of the strength of a Ni-based alloy and insusceptible to oxygen and turbine members each being composed of each sintered material. There is provided the sintered material of austenite steel powder which contains 25 to 50% Ni; 12 to 25% Cr, 3 to 6% Nb; 0.001 to 0.05% B; not more than 1.6% Ti; not more than 6% W; not more than 4.8% Mo; and not more than 0.5% Zr in percentage by mass, with a balance made up of Fe and unavoidable impurities.

Abstract: An axial flow rotating machine includes: a rotor; a plurality of vanes; and a medium flow modification member. Each of the vanes has an inner shroud and one or more seal fins. An annular groove, which is recessed toward a radially inner side, in which the inner shroud and the seal fins are placed in a non-contact manner, is formed at a rotor shaft. A distance from an end of the inner shroud on a furthest axially downstream side to a downstream-side groove side surface is a distance (L). A distance (Lf) from a most-downstream seal fin to a medium flow modification surface is equal to or less than the distance (L) in the axially downstream side.

Abstract: In a gas turbine in which a seal member seals a gap between a transition piece and a nozzle end wall in a turbine first stage, the transition piece and the nozzle end wall has a seal groove. The seal member includes a hook portion that slides in the turbine radial direction with respect to the flange and a seal plate portion inserted in the groove. The groove and the portion are configured to include a surface contact region in which a surface of the groove and the portion are in surface contact with each other, a non-contact region disposed on a side closer to the transition piece than the region, and a hole provided at the portion so as to face the surface in the groove across a gap in the region.

Abstract: A gas turbine includes an air cooler that subjects compressed air extracted from a compressor to heat exchange and supplies the cooled compressed air to a cooling system of a rotor system in a turbine; an air cooler bypass line that bypasses the compressed air introduced into the air cooler; an electric valve provided in the air cooler bypass line; and a control unit. The control unit controls opening and closing of the electric valve such that, during activation of a gas turbine, a degree of opening of the electric valve is set at or below a low-level degree of opening and such that, after the load of the gas turbine has been increased, the degree of opening of the electric valve is set to be larger than the low-level degree of opening.

Abstract: A flow path width at a hub endwall of a blade main body decreases toward a minimum width from a leading edge, and increases toward a trailing edge from the minimum width, the flow path width at a reference blade height aparted toward a tip side from the hub endwall of the blade main body gradually decreases toward the trailing edge from the leading edge, and an axial chord length position of the minimum flow path widths at respective blade height shift toward a transition to the trailing edge side from the hub endwall toward the tip side of the blade main body and coincides with the trailing edge at the reference blade height.

Abstract: A blade main body (51) of a gas turbine is provided with a first cooling passage part (58), a second cooling passage part (59), a column part (60), and a plurality of protrusions. The first cooling passage part (58) is provided at the side near to a leading edge (55). The second cooling passage part (59) is provided at the side near to a trailing edge (56). The column part (60) is provided between the first cooling passage part (58) and the second cooling passage part (59), and is continuously formed between a base part and an end part of the blade main body (51). The protrusions protrude from the inner wall surfaces of the first cooling passage part (58) and the second cooling passage part (59).

Abstract: A rotating electrical machine includes: a rotor; a stator; a high voltage bushing; power lines connecting the stator coil to the bushing; a support insulator that supports the power lines; a rotating electrical machine outer casing that contains at least the rotor, the stator and a connection portion between the stator coil and the power lines, and is filled with hydrogen gas; and a terminal box which communicates with the outer casing and is attached to a lower portion of the outer casing, the insulator installed in the terminal box, and terminal box containing at least the power lines supported by the insulator and a part of the bushing connected to the supported power lines. The insulator is installed vertically on a bottom face of the terminal box, and the vertically installed insulator and a portion of the bushing in the terminal box are disposed in parallel with each other.

Abstract: A method for operating a flue gas purification system, comprising, in the flue gas purification system, equipped with a boiler which can burn oil fuel and coal fuel either simultaneously or switching therebetween, a denitration equipment having a reducing agent injector and a catalytic reactor, an inlet flue to guide flue gas discharged from the boiler to the denitration equipment, an outlet flue to guide flue gas discharged from the denitration equipment, a bypass flue which can guide flue gas from the inlet flue to the outlet flue so as to bypass the denitration equipment, and a bypass damper, opening the bypass damper and burning oil fuel in the boiler being in condition not yet suitable for coal combustion to allow the flue gas discharged from the boiler to dividedly flow to the denitration equipment and the bypass flue, switching the oil fuel to coal fuel when the boiler is in condition suitable for coal combustion to burn the coal fuel in the boiler, closing the bypass damper after switching the oil fue

Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.

Abstract: Flue gas generated when fuel is subjected to combustion by a combustor such as a boiler is supplied, and a sulfur oxide is reduced or removed from the supplied flue gas. A desulfurization apparatus 10A includes an absorber 11, a gas introduction unit 13a, an absorbent jetting unit 15, a plurality of water flow oxidation devices 20, an absorbent supplying unit 25, a demister 30, a gas discharging unit 13b, and a control device 40 that varies the number of water flow oxidation devices 20 that jet absorbent 14 and air 21 based on a rate of the sulfur compound in the absorbent 14 within an absorbent storage tank 11A.