Abstract: A gas turbine combined cycle (GTCC) power generation plant (100) equipped with a control unit which performs a load reduction following operation with respect to a fuel adjustment valve (Vd), a main steam valve (V1), and a bypass valve (V4), wherein, when a load reduction request for reducing a GTCC load target value has been input in a closed bypass operation, the degree of opening of the fuel adjustment valve (Vd) is reduced in accordance with the target value while the main steam valve (V1) is in an open state, and the bypass valve (V4) is placed in an open state, after which the bypass valve (V4) is placed in the closed state when the GTCC load reaches the target value.

Abstract: The present invention improves the even distribution of a powder to a pulverized coal pipe. A rotary classifier including: a rotary shaft rotatably supported around a rotational axis extending in a vertical direction; a frame body supported by the rotary shaft and including an opening on the outer periphery of the frame body; a plurality of powder outlets provided along the rotation direction and opening on the upper section of the frame body; a plurality of blades extending in the vertical direction at the opening on the outer periphery of the frame body and provided along the rotation direction; and an annular member that serves as a constricting section provided so as to narrow the interval from the blades to the rotary shaft.

Abstract: An inspection assistance device includes a damage drawing input part configured to input a damage drawing, i.e. a drawing illustrating damages of target parts, a display configured to display the damage drawing and target figures illustrating target parts to be overlaid with each other, and a storage configured to store the damage drawing separately from the target figures in connection with the target figures.

Abstract: A ventilation flow path for guiding a compressed gas flowing between two blade rows adjacent in an axial direction to an interior of a compressor rotor shaft is formed in the compressor rotor shaft. The ventilation flow path has an introduction part, a plurality of branch parts, and a collection part. The introduction part guides the compressed gas flowing between the two blade rows into the compressor rotor shaft. The plurality of branch parts branch out from the introduction part, and are formed in mutually different positions in the axial direction. The collection part is connected to each of the plurality of branch parts. The compressed gas flows into the collection part after passing through the plurality of branch parts, and then, the compressed gas that has flowed in flows outside through the collection part.

Abstract: A removal device includes a base, a push rod, a rod-moving mechanism and a rod guide. The base is restrained immovably in a first direction. The push rod can protrude from a front surface of the base toward a front side. The rod-moving mechanism is installed on the base. The rod-moving mechanism moves the push rod toward the front side. The rod guide is attached to the base. The rod guide guides movement of the push rod by the rod-moving mechanism in a second direction that forms an acute angle with respect to the first direction.

Abstract: A steam turbine is for a combined cycle plant. The combined cycle plant includes a gas turbine; a boiler a heat source of which is a flue gas discharged from the gas turbine; a high-pressure steam turbine that includes a rotor extending along an axial center of rotation of the rotor, a steam passage provided along the extending direction of the rotor between the rotor and a casing for the rotor, and a high-pressure steam supply portion provided to communicate, from outside the casing through the casing, with the steam passage and configured to be supplied with superheated steam, the high-pressure steam turbine being driven by high-pressure steam generated by the boiler; and a low-pressure steam turbine configured to be driven by low-pressure steam generated by the boiler and by the steam that has flowed through the high-pressure steam turbine.

Abstract: In a gas turbine exhaust member and an exhaust chamber maintenance method, the gas turbine exhaust member is provided with: an inside diffuser that forms a tubular shape and is divided into multiple parts in the circumferential direction; a first seal housing that forms a tubular shape and is integrally formed in the circumferential direction, the front end of which being coupled to the rear end of the inside diffuser; a second seal housing that forms a tubular shape and is integrally formed in the circumferential direction, the front end of which being coupled to the rear end of the first seal housing; and a supporting coupling part that supports the rear end of the first seal housing and the front end of the second seal housing so as to allow the rear end and the front end to move in the axial direction.

Abstract: A spray nozzle and a deaerator each include an external cylinder provided with a plurality of jetting outlets on an outer circumference portion thereof, an inner cylinder that is supported inside the external cylinder so as to be movable in an axial center direction and is provided with a plurality of first communication holes capable of communicating with the jetting outlets, and an open-close valve that includes a shaft coupled to the inner cylinder and a valve body provided at a distal end portion of the shaft and capable of opening and closing a distal opening of the external cylinder. The spray nozzle and the deaerator thus structured provide improved performance by preventing an increase in pressure loss occurring regardless of a jet flow amount.

Abstract: A gas turbine startup method and device wherein low-pressure, medium-pressure, and high-pressure air bleed flow paths supply compressed air bled from low-pressure, medium-pressure, and high-pressure air bleed chambers, respectively, of a compressor as cooling air to a turbine. Low-pressure, medium-pressure, and high-pressure exhaust flow paths discharge the compressed air in the low-pressure, medium-pressure, and high-pressure air bleed flow paths, respectively to the turbine exhaust system, and the low-pressure, the medium-pressure, and the high-pressure exhaust flow paths are provided respectively with a low-pressure exhaust valve, a medium-pressure exhaust valve, and a high-pressure exhaust valve. When the gas turbine starts up, the high-pressure exhaust valve is opened before the startup state of the gas turbine reaches a region in which rotation stall occurs.