Mitsubishi Heavy Industries Limited

Mitsubishi Power, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Mitsuyoshi Tsuchiya

Ryo Takata

Yu Shibata

Yoshinori Tanaka

Akitsugu Fujita

Yasuhiro Sasao

Nao Taniguchi

Masatomo Kamada

Hiroshi Yokota

Kenichi Murakami

Mamoru Odagawa

A steam turbine includes a rotor; a casing which houses the rotor; a plurality of rotor blades disposed around the rotor; and a plurality of stationary vanes supported on the casing. The stationary vane includes a vane body portion and an inner race positioned on an inner side of the vane body portion in a radial direction of the rotor. The stationary vanes include a first stationary vane having a through hole formed through the vane body portion. The rotor has a cavity having a concave shape and being formed such that at least a part of the inner race of the first stationary vane is housed in the cavity. The steam turbine includes a steam passage to discharge steam extracted from a space upstream of the first stationary vane in the casing to the cavity from the inner race through the through hole of the first stationary vane.

Steam turbine

A turbine nozzle includes a plurality of blades arranged so as to form a tapered flow passage between each two adjacent blades. A suction surface of each blade includes a curved surface, and a throat of the flow passage is formed between the curved surface of one blade and a trailing edge of the other blade of the two adjacent blades at a throat position. An upstream end of the curved surface is positioned upstream of the throat position, and a downstream end of the curved surface is positioned downstream of the throat position.

Turbine nozzle and axial-flow turbine including same

A geothermal turbine includes: a rotor; a casing which houses the rotor; a plurality of rotor blades disposed around the rotor; a plurality of stationary vanes supported on the casing; at least one seal portion disposed in a gap between the rotor and the casing at an upstream side of a first-stage rotor blade of the plurality of rotor blades so as to seal leakage steam which flows out inward in a radial direction of the rotor from between a first-stage stationary vane of the plurality of stationary vanes and the first-stage rotor blade; and a steam passage configured to extract a part of steam after passing the first-stage stationary vane and discharge the part of steam to the gap through an interior of the first-stage stationary vane.

Geothermal turbine

A steam turbine include a steam chest casing that is provided with a plurality of nozzle openings along a circumferential direction; a partition wall to partition the steam chest casing into the main steam chest and a sub-steam chest with smaller capacity than the main steam chest; a main steam pipe that supplies steam to the main steam chest; a steam chest connection pipe that distributes part of the steam, which is supplied to the main steam chest, to the sub-steam chest; a steam chest connection valve; a pressure gauge that measures the pressure of the steam flowing in the main steam pipe; and a control unit that closes the steam chest connection valve when the measured pressure is less than more than or equal to a predetermined threshold value, and opens the steam chest connection valve when the measured pressure is less than the predetermined threshold value.

Operation method for steam turbine, and steam turbine

This invention relates to high-Cr precision casting materials containing carbon, silicon, manganese, chromium, nickel, vanadium, niobium, nitrogen, molybdenum, tungsten, cobalt and optionally boron in specific weight proportions, the balance being iron and incidental impurities, as well as turbine blades made by a precision casting process using these materials. Thus, the present invention provides high-Cr precision casting materials which are capable of precision casting and, moreover, have excellent high-temperature strength, as well as inexpensive and highly reliable turbine blades made by using these casting materials and such turbine blades also having lighter weight.

Growing community of inventors

Yokohama, Japan

Mitsuyoshi Tsuchiya