Kawasaki Jukogyo Kabushiki Kaisha

Daisuke Kariya

Hidetsugu Ishimaru

Yuichi Saito

Naoto Sakai

Seiji Yamashita

Ryota Takeuchi

Toshihiro Komiya

Toshimitsu Adachi

Yasuo Miwa

Naotaka Yamazoe

Hidetaka Miyazaki

Tomohiro Sakamoto

Yosuke Kimura

Takeshi Okumura

Yoshinobu Mori

Yoshihiro Matsuda

Naoki Miyake

Hajime Shimizu

Yuichi Saitou

Keisuke Nakagawa

A raw material gas liquefying device includes a feed line which feeds a raw material gas, a refrigerant circulation line which circulates a refrigerant, the refrigerant circulation line including an expansion unit of a turbine type which expands the refrigerant to generate cryogenic energy, and an expansion unit entrance valve provided at an entrance side of the expansion unit, a heat exchanger which exchanges heat between the raw material gas and the refrigerant, a cooler which performs initial cooling of the raw material gas and the refrigerant by heat exchange with liquid nitrogen, and a controller which manipulates the opening rate of the expansion unit entrance value and performs a feedback control so that the rotation speed of the expansion unit reaches a predetermined target value, and outputs the opening rate command to the expansion unit entrance valve, at start-up and stop of the expansion unit.

Raw material gas liquefying device and method of controlling this raw material gas liquefying device

A raw material gas liquefying device includes a feed line; a refrigerant circulation line; and a controller. In a refrigerant liquefaction route, a refrigerant flows through a compressor, a heat exchanger, a circulation system JT valve, a liquefied refrigerant storage tank, and the heat exchanger, and returns to the compressor. In a cryogenic energy generation route, the refrigerant flows through the compressor, the heat exchanger, an expansion unit, and the heat exchanger, and returns to the compressor. The controller determines if a refrigerant storage tank liquid level is within an allowable range, manipulates a feed system JT valve opening rate to control refrigerant temperature at the high-temperature-side refrigerant flow path exit side of the heat exchanger, and manipulates the opening rate of the feed system JT valve to control the refrigerant storage tank liquid level so that the refrigerant storage tank liquid level falls into the predetermined allowable range.

The amount of consumption of gas is reduced when the gas is expanded to be cooled by using a plurality of expansion turbines. A high-pressure expansion turbine includes: a gas supply passage through which bearing gas is supplied to a bearing portion; and a gas discharge passage through which the bearing gas which has been supplied from the gas supply passage to the bearing portion is discharged from the bearing portion. A low-pressure expansion turbine includes: a gas supply passage through which the bearing gas is supplied to a bearing portion; and a gas discharge passage through which the bearing gas which has been supplied from the gas supply passage to the bearing portion is discharged from the bearing portion. The bearing gas discharged from the gas discharge passage of the high-pressure expansion turbine is supplied to the gas supply passage of the low-pressure expansion turbine.

Gas expansion system

An expansion turbine configured such that even when pressure of process gas steeply changes, the amount of process gas leaking from a gap between an impeller and a cover is made small. The expansion turbine includes a gas supply passage which is connected to any one of a gas supply passage and a gas discharge passage and through which gas is supplied to a region located between a rotor member and a casing member.

Expansion turbine

A liquefier system includes: a feed line configured to feed a raw material gas from a raw material supply source such that a pressure of the raw material gas in a predetermined portion of the feed line is kept higher than or equal to a predetermined pressure; a cooling medium circulation line configured to cause a cooling medium to circulate; a static pressure gas bearing configured to be supplied with the gas that has a pressure higher than or equal to the predetermined pressure and to rotatably support a rotating shaft of an expansion turbine; and a bearing supply line configured to connect the predetermined portion of the feed line and a gas inlet of the static pressure gas bearing, such that the gas is supplied to the static pressure gas bearing.

Liquefier system

A turbine generator system includes a turbine power generation unit including a generator and a turbine for driving the generator. The turbine generator system also includes an evaporator, a condenser, a medium feeding pump, a circulating pump, and a feeding passage. The evaporator receives heat from a heat source and supplies a working medium in a vapor phase containing a lubricant to the turbine power generation unit. The condenser condenses the working medium which has flowed through the turbine. The medium feeding pump raises a pressure of the condensed working medium and feeds the working medium to the evaporator, and the working medium extracted from the evaporator is supplied through the feeding passage to bearings in the turbine power generation unit.

Turbine generator system

Growing community of inventors

Kobe, Japan

Daisuke Kariya