Mitsubishi Hitachi Power Systems, Ltd.

Yosuke Eto

Ryo Higashi

Ken Ugai

Yoshikiyo Okamoto

Jun Sasahara

Takeo Hirasaki

The gas turbine system has: a gas turbine having a compressor, a combustor, and a turbine; a fuel supply mechanism for supplying fuel to the combustor; a composition detection unit for detecting the composition of the fuel; and a controller for controlling the flow rate of the fuel supplied from the fuel supply mechanism to the combustor, on the basis of a function of the exhaust temperature of exhaust gas passing through the turbine and either air pressure of air expelled from the compressor to the combustor or an expansion ratio of the turbine. The controller calculates the specific heat ratio of the combustion gas from the composition of the fuel detected by the composition detection unit, corrects the function on the basis of the calculated specific heat ratio, and controls the flow rate of the fuel on the basis of the corrected function.

Gas turbine system, controller, and gas turbine operation method

A consumption amount of high-calorific gas such as coke oven gas (COG) during operation of a gas turbine is reduced, halt of the gas turbine due to clogging of a pilot system, a malfunction of a compressor which compresses high-calorific gas is prevented, and reliability of the gas turbine is improved. When operation of the gas turbine () starts, with use of both a first fuel supply system () which supplies a high-calorific fuel for a first nozzle constituting a combustor (), and a second fuel supply system () which supplies a low-calorific fuel for a second nozzle constituting the combustor (), the high-calorific fuel and the low-calorific fuel are supplied to the combustor (), and at a time when the gas turbine () reaches output power which enables continuous operation with only the low-calorific fuel, supply of the high-calorific fuel to the combustor () is shut off, and only the low-calorific fuel is supplied to the combustor ().

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Kanagawa, Japan

Yosuke Eto