Mitsubishi Heavy Industries Limited

Jun Yasuraoka

Hiroyuki Yamamoto

Koichi Akagi

Hideki Haruta

Tomoka Tanaka

Masayuki Takahama

Yoshiyuki Kita

Yasuhiro Hashimoto

Hidetoshi Iida

Akimasa Muyama

Kouzo Toyama

A means detecting the flow of the steam at the gateway of the steam cooling system is provided, and the timing of the finish of the warm-up process of the steam cooling system at start-up is decided by the difference of the flow of the steam at the gateway. In case of the difference between the flow of the steam at the inlet and the flow of the steam at the outlet is below a permitted value, it is considered that residual air and drainage have been purged, the warming-up is finished, and the step for starting the gas turbine can be performed.

Combined cycle power generation plant

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

A combined cycle power plant having a gas turbine plant and a steam turbine plant combined together is disclosed. Steam is used for cooling a high-temperature portion (,) to be cooled around the combustor (,) of the gas turbine (,). The power plant has an air duct (,), connected to a steam path (,) for supplying steam for cooling the high-temperature portion (,), for cooling this portion using air if the steam for cooling is insufficient, typically when the plant is activated or stopped, and the air duct includes a device for boosting the air to have a pressure higher than that inside a combustor (,) of the power plant. Accordingly, the combustor and attached piping arrangement can be protected from burning and the power plant can be safely and reliably operated for a long time.

Combined cycle electric power plant

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Takasago, Japan

Jun Yasuraoka