Hitachi, Ltd.

Hitachi Plant Technologies, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Tadaharu Kishibe

Yasuo Takahashi

Susumu Nakano

Manabu Yagi

Hisashi Hamatake

Takanori Shibata

Hiromi Kobayashi

Tetsuya Kuwano

Masanori Tanaka

Hideo Nishida

Satoshi Dodo

Tomoaki Inoue

Kuniyoshi Tsubouchi

Hiroyuki Shiraiwa

Kiyoshi Segawa

Goingwon Lee

Seiichi Kimura

A bearing device of a gas turbine power generation equipment provides damping vibration of a shaft and lubricates and cools the bearing main body. The bearing devices have sleeves provided on the outer circumference sides of the bearing main bodies and bearing housings holding the respective sleeves via O-rings while each forming an annular clearance passage between each of the outer circumferences of the sleeves and a corresponding one of the bearing housings. The bearing housing has a feed-water hole communicating with the clearance passage and adapted to feed water thereto. The sleeve has a lead water hole communicating with the clearance passage and is adapted to lead water to the bearing main body, and a discharge hole which communicates with the clearance passage and is adapted to discharge water therefrom.

Bearing device of gas turbine power generation equipment and gas turbine power generation equipment

A centrifugal compressor is equipped with an impeller having a blade angle distribution that makes it possible to achieve a relatively wide operating range. The blade angle of a shroud side facing a circular plate of a blade is termed a first angle and a blade angle of a hub side disposed at the circular plate is a second. The shroud side is formed in a curved shape having an angle distribution from a front area in a shaft direction toward a centrifugal direction in which the first angle is the local maximum point before a substantially middle portion and the local minimum point after the substantially middle point. The hub side is formed in a curved shape having an angle distribution from the front area in the shaft direction toward the centrifugal direction in which the second angle is the maximum local point before the substantially middle portion.

Centrifugal compressor, impeller and operating method of the same

A multistage centrifugal compressor includes a rotary shaft, and multistage impellers attached to the rotary shaft. Each of the impellers includes a hub, a shroud and blades therebetween in a radial cascade arrangement. An annular suction passage for guiding the fluid flow from the inward radial direction to a blade inlet is disposed upstream of the centrifugal impeller. A diffuser is disposed downstream of the centrifugal impeller. A bend portion is disposed downstream of the diffuser, and a return channel with a guide blade portion is disposed downstream of the bend portion. The annular suction passage at a hub side includes an axial parallel portion.

Multistage centrifugal compressor

In a heat pump system including a water purifier and an evaporator for evaporating feed-water to produce steam, water used for spray cooling is effectively used and productivity of purified water used for the spray cooling is increased. Discharged water from the water purifier is supplied to the evaporator when water used for spray cooling is produced by use of the water purifier. Otherwise, drain of the evaporator having higher temperature is supplied to the water purifier by using such a fact that in a reverse osmosis membrane type water purifier, the higher the temperature of feed-water is, the higher the purified water productivity becomes.

Heat pump system, operation procedure therefor and evaporator system

The invention is intended to maintain turbine reliability when, based on a gas turbine designed for one desired cycle, a gas turbine for another different cycle is manufactured. A channel of a compressor is formed such that a mass flow of a fluid compressed by the compressor changes. Thus, when manufacturing, based on the gas turbine designed for one desired cycle, the gas turbine for another different cycle, turbine reliability can be maintained.

Gas turbine and manufacturing process of gas turbine

A turbine nozzle () that, among components constructing a turbine, reaches particularly high temperature is efficiently cooled with a relatively simple structure. A double casing structure in which a turbine casing () is provided outside a turbine shell () is formed. The turbine casing () functions as a flow path () for compressed air () before combustion. The turbine shell () covers a turbine nozzle () and a radial turbine impeller () and forms flow paths () for combustion gas (). The compressed air () before combustion flowing in the flow path (), for compressed air, having air-tightness between itself and the outside air is blown to the turbine nozzle () through a through-hole () penetrating both wall surfaces of the turbine shell () so that the turbine nozzle () is evenly cooled and the compressed air used to cool the turbine nozzle is made to flow toward the turbine impeller ().

Radial turbine and method of cooling nozzle of the same

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Hitachinaka, Japan

Tadaharu Kishibe