Kabushiki Kaisha Toshiba

Toshiba Energy Systems & Solutions Corporation

Asako Inomata

Katsuya Yamashita

Shoko Ito

Yoshitaka Fukuyama

Fumio Ohtomo

Yuji Nakata

Kazuhiro Saito

Takeo Suga

Kazutaka Ikeda

Hisashi Matsuda

Takao Inukai

Akinori Koga

Junji Ishii

Hironobu Yamamoto

Sachio Shibuya

Hiroyuki Kawagishi

Kunihiko Wada

Iwataro Sato

Shogo Iwai

Hideyuki Maeda

Koji Yamaguchi

Hiroshi Kawakami

Takashi Ogawa

Yusuke Suzuki

Kazutaka Tsuruta

Naoki Shibukawa

Fumio Ootomo

Satoru Sekine

Shigeru Matsumoto

Yutaka Ishiwata

Akihiro Onoda

Daisuke Nomura

Tomohiko Tsukuda

Yoshiki Niizeki

Tomohiro Tejima

Fumio Otomo

Koji Yakushi

Hideo Nomoto

Yukio Oohashi

Eiji Nakagawa

Yuujiro Nakatani

Shinji Tanigawa

A stator blade of an embodiment includes: a blade effective part having hollow portions; an outer shroud having an outer plate flange portion provided on a radial-direction outer side of the blade effective part, and a pair of outer mounting portions provided in a circumferential direction on a front edge side and a rear edge side; an inner shroud having an inner plate flange portion provided on a radial-direction inner side of the blade effective part; cooling medium introduction passages which introduce a cooling medium via opening portions formed in the outer plate flange portion and passing through the outer plate flange portion in a radial direction, to the hollow portions; and a cooling medium introduction passage formed in a direction along a surface of the outer plate flange portion in a wall thickness of the outer plate flange portion, which introduces a cooling medium to the hollow portion.

Turbine stator blade

A turbineincludes: a turbine rotor having a rotor main body including a hollow part into which a cooling fluid flows, and a plurality of rotor wheels arranged in an axial direction of the rotor main body and protruding from the rotor main body. A cooling-fluid introducing passage extending from the hollow part in a direction intersecting with the axial direction of the rotor main body is formed in the rotor main body so as to allow the cooling fluid in the hollow part to flow through the cooling-fluid introducing passage and then to flow around the rotor wheel to be conducted to the working-fluid flow passage. A flow-rate control plug regulating a flow rate of the cooling fluid flowing through the cooling-fluid introducing passage is disposed in the cooling-fluid introducing passage.

Turbine

A steam turbineof an embodiment has seal ringsbetween an inlet sleevefor introducing steam and an inner casingand an outer casinginto which the inlet sleeveis inserted. The seal ringshave high-temperature side seal ringswhich are disposed their inner circumferences contacted to the outer circumference of the inlet sleeve, and low-temperature side seal ringswhich are formed to have inner and outer diameters larger than those of the high-temperature side seal ringsand disposed with their outer circumferences contacted to the inner casingor the outer casing. A thermal barrier layeris disposed between the inner circumferences of the high-temperature side seal ringsand the outer circumference of the inlet sleeveand between the high-temperature side seal ringsand the low-temperature side seal rings

Steam turbine

A plurality of blades are studded in a rotor disc integrated with the rotor along the circumferential direction of the rotor, a plurality of vanes are attached to a casing covering the rotor along the circumferential direction of the rotor, and an internal diaphragm disposed on rotor-side surfaces of the vanes in such a way that the internal diaphragm faces the rotor disc. The vanes and the blades adjacent to each other in the axial direction of the rotor form a turbine stage. A rotor-side cooling path is formed through the rotor disc in the axial direction of the rotor, and a diaphragm-side cooling path is formed through the internal diaphragm in the axial direction of the rotor, and a cooling medium flowing through the rotor-side cooling path diverts into the diaphragm-side cooling path and a labyrinth flow path provided between the internal diaphragm and the rotor.

According to an embodiment, at least one first outer ring has an annular outer ring cavity to which external cooling steam is supplied. A radial direction cooling hole connecting with the outer ring cavity is formed in the stator blades connected to the first outer ring. An annular inner ring cavity connecting with the radial direction cooling hole is formed in a first inner ring constituting one diaphragm together with the first outer ring. Cooling steam blowing holes connecting an annular wheel space and the inner ring cavity are formed. The annular wheel space is formed between the first inner ring and a rotor wheel adjacent to the first inner ring.

A steam turbineis provided with a double-structure comprising an inner casingand an outer casing. A turbine rotor, in which plural stages of moving bladesare circumferentially implanted, is operatively disposed in inner casing. A diaphragm outer ringand a diaphragm inner ring are disposed along the circumferential direction in inner casing. Stationary bladesare circumferentially provided between diaphragm outer ringand the diaphragm inner ring, so that diaphragm outer ring, the diaphragm inner ring and stationary bladesform a stage of stationary blades. The stages of the stationary blades are arranged alternately with the stages of moving bladesin the axial direction of turbine rotor. A cooling medium passagefor passing a cooling medium CM which is supplied through a supply pipeis formed between inner casingand diaphragm outer ring

Steam turbine, method of cooling steam turbine, and heat insulating method for steam turbine

In one embodiment, a calculation method of moisture loss in a steam turbine calculates first a wetness fraction at the inlet and outlet of each of stationary blade cascades and rotor blade cascades. Subsequently, the moisture loss is classified into (1) supersaturation loss, (2) condensation loss, (3) acceleration loss, (4) braking loss, (5) capture loss and (6) pumping loss, and a loss for calculation of the moisture loss is selected from the above losses (1) to (6) according to the wetness fraction of steam at the inlet and outlet of each blade cascade. An amount of each selected loss is calculated, and an amount of moisture loss at each blade cascade is calculated.

Calculation method of moisture loss in steam turbine

A steam turbine includes a casing, a rotor arranged inside the casing so as to extend in an axial direction of the casing, a rotor disk integrally formed with the rotor, a rotor-side implanting portion formed in the rotor disk, a plurality of moving blades arranged on the rotor disk in a circumferential direction of the rotor, and a moving blade-side implanting portion formed in the moving blade, in which the moving blade-side implanting portions of the moving blades are engaged with the rotor-side implanting portions, respectively. A cooling medium flows through a gap formed at least on a blade portion side of the moving blade among gaps formed between the moving blade-side implanting portions and the rotor-side implanting portions.

Steam turbine and cooling method thereof

In one embodiment, a steam device includes a high-temperature member and a low-temperature member. One surface of the high-temperature member is exposed to high-temperature steam, and the other surface is cooled by cooling steam having a temperature lower than the high-temperature steam. The low-temperature member is disposed to face the high-temperature member with a passage for the cooling steam therebetween and is formed of a material having a heat resistance lower than that of the high-temperature member. The steam device has at least one high-reflectance film selected from a first high-reflectance film, which is formed on the surface of the high-temperature member which is exposed to the high-temperature steam and has a higher reflectance with respect to infrared rays than the high-temperature member, and a second high-reflectance film, which is formed on the surface of the low-temperature member facing the high-temperature member and has a higher reflectance with respect to infrared rays than the low-temperature member.

Steam device

A steam turbineis provided with a casing, a turbine rotordisposed through the casing, and labyrinth portionswhich are disposed at the boundary between the casingand the turbine rotor. The steam turbineis further provided with a sealing steam pipefor supplying sealing steam to the labyrinth portionsand a gas supply pipefor supplying the labyrinth portionswith a cooling gas for cooling the turbine rotoror a heating gas for heating the turbine rotor

Steam turbine and method of cooling steam turbine

A carbon-dioxide-capture-type steam power generation systemaccording to the present invention comprises a boilerproducing an exhaust gasby combusting a fueland having a flue; an absorbing unitbeing configured to absorb the carbon-dioxide contained in the exhaust gasinto an absorbing solution; and a regenerating unitbeing configured to release the carbon dioxide gas from the absorbing solution absorbing the carbon dioxide and discharge the released carbon dioxide gas. Further, in this system, a reboileris provided for receiving a heating-medium as heat source, producing a steamand supplying the produced steamto the regenerating unit. Additionally, in the flueof the boiler, a boiler-side heat exchangeris provided for heating the heating-medium by the exhaust gaspassing therethrough.

Carbon-dioxide-capture-type steam power generation system

The present invention provides a turbine system which can start a turbine, while controlling thermal stress generated in a turbine rotor and an expansion difference, due to thermal expansion, between a casing and the turbine rotor, to be lower than defined values, respectively. The turbine system () according to the present invention includes the turbine () having a casing () and the turbine rotor () rotatably attached to the casing (), and a main steam pipe () connected to an upstream portion of the casing (). A control valve () adapted for controlling a flow rate of steam discharging into the casing () is provided with the main steam pipe (), and a power generator () is coupled with the turbine rotor (). Additionally, a starting control system () is adapted for controlling the control valve (), while obtaining an operational amount of the control valve ().

Turbine system and method for starting-controlling turbine system

This invention provides an optimum value search apparatus, method, recording medium, and computer program product used in designing, analyzing, or testing a device having a plurality of factors that have effects on a characteristic. In this method, an orthogonal array is generated by setting level values obtained from the initial values of the factors to the coordinates of a two-dimensional table including a matrix of the characteristics and the factors. From the characteristics on the orthogonal array, characteristic values obtained on the basis of combinations of the level values of the factors of a single characteristic are grasped. A combination having a most excellent characteristic value is selected. The level values of the factors in the characteristic corresponding to the selected combination are reset in the orthogonal array. After resetting, processes are repeatedly executed to search for an optimum value as a most excellent one of the characteristic values.

Optimum value search apparatus and method, recording medium, and computer program product

A row of moving blades for a steam turbine has moving blades elongated radially which are arranged peripherally around and secured to a turbine rotor. The row also has an intermediate support structure for holding the blades to each other at a radially intermediate position. The support structure has a shape of a streamline cross section. The support structure may include a tie wire secured to the blades, or lugs protruding from the blades and combined to each other. The support structure may include lugs protruding from the blades to each other, and a sleeve combining the lugs. The shape of a streamline cross section may have an obtuse-angle or acute-angle upstream part.

Steam turbine, and intermediate support structure for holding row of long moving blades therein

A turbine blade cascade structure includes a plurality of blades arranged in series in a circumferential direction on a wall surface, in which a corner portion defined by the wall surface and a front edge portion of each of blade bodies supported by the wall surface, to which a working fluid flows, includes a cover portion (fillet) that extends toward an upstream side of a flow of the working fluid. The turbine blade cascade structure is capable of reducing the secondary flow loss of the secondary flow in spite of the fluctuation of an incident angle of the working fluid flowing to the front edge portion of the blade body.

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Yokohama, Japan

Asako Inomata