Mitsubishi Heavy Industries Limited

Kobe Steel, Ltd.

Yasuhiro Hashimoto

Hiroshi Tanabe

Tomoka Tanaka

Masayuki Takahama

Koichi Akagi

Satoshi Tanaka

Hideki Haruta

Yoshikazu Seki

Yoshiyuki Kita

Masahiro Murakami

Jun Yasuraoka

Hidetoshi Iida

Yoshinori Kita

An object of the present invention is to provide a method of starting and stopping a gas turbine and a start-and-stop control device, which are capable of solving a problem of a failure in normally igniting a fuel gas due to a purge gas (nitrogen gas) remaining in a fuel gas pipe and thereby igniting the fuel gas stably. For this purpose, the start-and-stop control device performs control at the time of starting the gas turbine by sequentially performing: first exhaust gas duct purge for pushing out a fuel gas remaining in an exhaust gas duct with compressed air from a compressor; fuel gas pipe purge for pushing out nitrogen gas remaining in a fuel gas pipe between a fuel gas shutoff valve and a combustor at the time of stopping the gas turbine by the fuel gas by opening a fuel gas shutoff valve; and second exhaust gas duct purge for pushing out the fuel gas remaining in the exhaust gas duct at the time of the fuel gas pipe purge by the compressed air from the compressor, and then the fuel gas is supplied to the combustor by opening the fuel gas shutoff valve again and ignited.

Method of starting and stopping gas turbine and start-and-stop control device

An air vent apparatus for a water tube, comprising:

Air vent apparatus for water tube

Disclosed is a powder filling method in which powder is filled in a powder box having a discharging port at its bottom segment, the powder box is moved over a cavity to be targeted while being slid on a die plate, thereafter the powder in the powder box is dropped into the cavity by its own gravitational force and filled there, wherein the powder in the powder box is applied with a mechanical agitation when the powder in the powder box is at least dropped into the cavity in the powder filling method for filling the powder in the powder box while being dropped at least into the cavity.

Powder filling method and powder filling apparatus

A gas turbine steam cooled system has a high temperature portion,outlet steam temperature maintained to a predetermined value without a cooling steam pressure becoming lower than the pressure in the gas turbine cylinder. Steam coming from an intermediate pressure superheater,of a waste heat recovery boiler,is led into the high temperature portion,of the gas turbine for cooling thereof. The temperature of the cooling steam at the outlet of the high temperature portion,is detected by a high temperature portion outlet steam temperature detector,, and a signal thereof is sent a lower value selector,via a temperature controller,. Pressure in the gas turbine cylinder is detected by a gas turbine cylinder pressure detector,, and pressure of the cooling steam at the high temperature portion,outlet is detected by a high temperature portion outlet steam pressure detector,. A differential signal thereof is sent to a pressure controller,. Signals from the temperature controller,and the pressure controller,are inputted into the lower selector,, and temperature control valve,is controlled by the lower value thereof to be opened and closed.

Steam cooled system in combined cycle power plant

Steam cooling apparatus for gas turbine

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Takasago, Japan

Yasuhiro Hashimoto