Abstract: A steam turbine includes an inner casing which has an inner casing body in which a first main flow path to which steam is to be supplied from an inner introduction port is defined, an outer casing which has an outer casing body which defines a second main flow path between the inner casing body and the outer casing body and an upper discharge port and a lower discharge port which are in the outer casing body and through which exhaust steam is to be discharged, an upper valve and a lower valve configured to adjust a flow rate of the exhaust steam which has been discharged, and a control unit which can independently control the upper valve and the lower valve.

Abstract: An exhaust hood is provided with an inner casing, an outer casing, and a diffuser. The inner casing surrounds a rotor from the outside in a radial direction, and forms a first space in which a fluid flows in an axial direction between the rotor and the inner casing. The diffuser is provided with a bearing cone that has a diameter that gradually widens moving towards an axial downstream side and forms a cylindrical shape extending to the axial downstream side to be continuous with the outer circumferential surface of a rotor shaft that forms the first space. An end edge on the axial downstream side of the bearing cone forms an oval shape in which a distance between the axial line and a second cone end part of a second side is greater than a distance between the axial line and a first cone end part.

Abstract: A steam turbine exhaust chamber defining therein an exhaust passage through which steam having passed through a last-stage blade of a steam turbine is introduced to a condenser includes: a casing including an outer peripheral wall portion formed on an outer peripheral side of the exhaust passage; a bearing cone disposed on a radially inner side of the outer peripheral wall portion; and at least one bypass passage carrying a part of steam flowing through the exhaust passage from a high-pressure portion of the exhaust passage to a low-pressure portion of the exhaust passage or to the condenser, The at least one bypass passage includes a high-pressure-side opening formed in the bearing cone and a low-pressure-side opening facing steam having a lower pressure than steam facing the high-pressure-side opening.

Abstract: There are provided a seal fin, a seal structure, and a turbo machine that can achieve a high leak-suppressing effect and can reduce leak loss of the turbo machine. The disclosure suppresses leak of a fluid from a gap between a first structure being in a static state and a second structure rotating around an axis line and is formed on the first structure so as to extend toward the second structure while keeping a clearance between a tip face thereof on an extending direction and the second structure. The first structure and the second structure face each other in a radius direction with the gap inbetween. A plurality of hollows opening at a tip on the extending direction are arranged along a circumference direction in parallel with each other on a front face facing an upstream side of a flow direction of the fluid.

Abstract: A sealing device for suppressing a leakage flow of a fluid via an annular gap between a stationary member and a rotary member of a rotary machine includes: a fixed fin having an annular shape and disposed in the annular gap; and a movable fin having an annular shape and being disposed adjacent to the fixed fin in an axial direction inside the annular gap. The movable fin has a greater thermal expansion coefficient than the fixed fin and is fixed to the fixed fin in a fixing region on a root-end side of the movable fin.

Abstract: An intake air cooling device includes a water supply line and a heat pump device. The water supply line is configured to send water to a waste heat recovery boiler which is configured to generate steam using heat of an exhaust gas from a gas turbine. The heat pump device is configured to transfer heat of air suctioned by the gas turbine to water flowing through the water supply line and thereby cool the air while heating the water.

Abstract: A boiler including one or more evaporators, an economizer, and a low-temperature heat exchanger. The economizer is located on a downstream side of the most downstream evaporator which is an evaporator at the most downstream side among the one or more evaporators. The low-temperature heat exchanger is located on the downstream side of the economizer, has an inlet for receiving water from the outside, and is configured to heat the water introduced from the inlet and sent to the economizer with the combustion gas.

Abstract: A gas turbine includes: a compressor configured to compress air; a combustor configured to combust fuel in the air compressed by the compressor so as to generate combustion gas; and a turbine configured to be driven using the combustion gas. Air coolers are configured to bleed the air from a plurality of places having different pressures in the compressor and cool the air bled from the respective places so as to generate cooling air. A waste heat recovery device is configured to recover waste heat from at least two of the air coolers.

Abstract: A tip shroud of a turbine rotor blade includes at least one first through hole. The first through hole includes a first opening and a second opening, the first opening penetrating the tip shroud in a radial direction so as to bring a first cavity and an inter-blade flow passage into communication. The first cavity is defined between a first seal fin and a second seal fin. The first seal fin extending in the radial direction on an outer side in a radial direction of the tip shroud, and the second seal fin extending in the radial direction at a position spaced part from the first seal fin in a direction of an axis of a rotor body. The first opening is formed at an intermediate position between the first seal fin and the second seal fin. The second opening is formed at a position facing the inter-blade flow passage.

Abstract: A seal device for a turbine is disposed around a rotor so as to separate a high-pressure space and a low-pressure space and includes: a plurality of thin plates arranged along an outer peripheral surface of the rotor. Each of the thin plates has a thin-plate tip surface facing the outer peripheral surface of the rotor; a first side plate disposed so as to face the high-pressure space and covering outer peripheral regions of first side surfaces; and a second side plate disposed so as to face the low-pressure space and covering outer peripheral regions of second side surfaces. The first side surface of each of the thin plates is covered with the first side plate in a region extending further to an inner side, in a radial direction of the rotor, than a region of the second side surface covered with the second side plate.

Abstract: There are provided a step seal, a seal structure, a turbo machine, and a method for manufacturing a step seal. The step seal suppresses leak of a fluid from a gap between a first structure and a second structure and is formed on the first structure so as to have a clearance between the step seal and a seal fin formed on the second structure. The first structure and the second structure face each other in a radius direction with the gap inbetween and rotate around an axis line relative to each other. The step seal includes: a step seal body having a step face facing an upstream side of a flow direction of the fluid and an opposed face facing the second structure; and a protrusion formed between the step face and the opposed face.

Abstract: A steam turbine (ST) includes a rotor (11) which is rotatable around an axis (Ar), an inner casing (21) surrounding the rotor (11) from an outer peripheral side, an outer casino (30) surrounding the rotor (11) and the inner casing (21) and defining an exhaust chamber between the inner casing (21) and the outer casing (30), the steam being exhausted to the exhaust chamber (30s), and a flow guide (27) which has a tubular shape and is installed on one end portion of the inner casing 21 in an axial direction (Da) in the exhaust chamber (30s) to guide the steam discharged from the rotor (11). The flow guide (27) has a turning surface (RA) which is connected to an outer peripheral surface (27A) and turns a fluid flowing along the outer peripheral surface (27A) toward the other side in the axial direction (Da).

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 steam turbine (1) includes an inner casing (3) which has an inner casing body (15) in which a first main flow path (11) to which steam is supplied from an inner introduction port (16) is formed, an outer casing (5) which has an outer casing body (20) which forms a second main flow path (120) between the inner casing body (15) and the outer casing body (20) and an upper discharge port (23) and a lower discharge port (24) which are provided in the outer casing body (20) and through which exhaust steam (S2) is discharged, an upper valve (7) and a lower valve (8) which adjust a flow rate of the discharged exhaust steam (S2), and a control unit (9) which can independently control the upper valve (7) and the lower valve (8).

Abstract: In an axial turbomachinery related to the invention, a structural body has a casing fin, a blade is provided with an upstream inclined surface that is inclined from an upstream side toward a downstream side, the structural body is provided with an upstream inclined inner wall surface that is inclined from the upstream side the downstream side, an inclination angle of the upstream inclined surface with respect to a central axis of relative rotation between the blade and the structural body is larger than an inclination angle of the upstream inclined inner wall surface with respect to the central axis, and an end position of the upstream inclined surface on a radially inner side is located radially outside an end position of the upstream inclined inner wall surface on the radially inner side.

Abstract: A steam turbine includes a rotating shaft (1); a rotor blade (4) having a platform (43) and a rotor blade main body (40); a casing (2); a stationary blade (7) having a stationary blade main body (70) and a stator shroud (71); and a projecting portion (45A) that projects from the platform (43) toward a upstream side in a central axis direction (Da). The projecting portion (45A) has, on a side thereof facing a radially inner side, a guide surface (45f) that gradually inclines or curves radially inward from a base end portion (45s) on the platform (43) side to a tip end portion (45t) on an upstream side in the central axis direction (Da).

Abstract: A waste heat recovery device includes: a low-boiling-point medium Rankine cycle in which a low-boiling-point medium circulates while the low-boiling-point medium is repeatedly condensed and evaporated; a heated water line that guides liquid water, which is heated here, to the low-boiling-point medium Rankine cycle from a waste heat recovery boiler; and a water recovery line that returns the water, which has passed through the low-boiling-point medium Rankine cycle, to the waste heat recovery boiler. The low-boiling-point medium Rankine cycle includes a heater that heats the low-boiling-point medium by exchanging heat between the low-boiling-point medium, which is a liquid, and liquid water, which has passed through the heated water line.

Abstract: A tip shroud of a turbine rotor blade includes at least one first through hole. The first through hole includes a first opening and a second opening, the first opening penetrating the tip shroud in a radial direction so as to bring a first cavity and an inter-blade flow passage into communication. The first cavity is defined between a first seal fin and a second seal fin. The first seal fin extending in the radial direction on an outer side in a radial direction of the tip shroud, and the second seal fin extending in the radial direction at a position spaced part from the first seal fin in a direction of an axis of a rotor body. The first opening is formed at an intermediate position between the first seal fin and the second seal fin. The second opening is formed at a position facing the inter-blade flow passage.

Abstract: A steam turbine exhaust chamber defining therein an exhaust passage through which steam having passed through a last-stage blade of a steam turbine is introduced to a condenser includes: a casing including an outer peripheral wall portion formed on an outer peripheral side of the exhaust passage; a bearing cone disposed on a radially inner side of the outer peripheral wall portion; and at least one bypass passage carrying a part of steam flowing through the exhaust passage from a high-pressure portion of the exhaust passage to a low-pressure portion of the exhaust passage or to the condenser, The at least one bypass passage includes a high-pressure-side opening formed in the bearing cone and a low-pressure-side opening facing steam having a lower pressure than steam facing the high-pressure-side opening.

Abstract: A steam turbine apparatus includes: an exhaust chamber which defines an exhaust flow passage; an outside casing including a radially outer wall portion formed on a radially outer side of the exhaust flow passage; an inside casing including a radially inner wall portion disposed on an inner side of the radially outer wall portion; a flow guide disposed on an end portion at a downstream side of the radially inner wall portion, the flow guide having a tubular shape whose distance from an axial center of the steam turbine increases along the flow direction; and at least one bypass flow passage connecting a first inner space upstream of the last stage rotor blade and a second inner space positioned at an outer side of the flow guide. The at least one bypass flow passage extends along an outer peripheral surface of the flow guide.