Mitsubishi Heavy Industries Limited

Hidetoshi Iida

Koichi Akagi

Hideki Haruta

Tomoka Tanaka

Yasuhiro Hashimoto

Yoshiyuki Kita

Masayuki Takahama

Jun Yasuraoka

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

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Takasago, Japan

Hidetoshi Iida