Control device, gas turbine combined cycle power generation system and control method

Abstract

The invention relates to a control device capable of shortening the plant start-up time as compared with the prior art, a gas turbine combined cycle power generation system equipped therewith, and a control method for the gas turbine combined cycle power generation system. In addition to a first fuel gas heater (6) utilizing the heated water from the outlet of an economizer (10) of a heat recoverysteam boiler (8), there is provided a second fuel gas heater (7) utilizing as the heat source the bleed air of a compressor (2) of a gas turbine (1). A control device (30) opens a bleed air control valve (17) of the piping (204) for supplying bleed air to the second fuel gas heater (7) at the time of starting the gas turbine combined cycle power generation system (1000) to heat a fuel gas (100) by the bleed air.

Description

technical field [0001] The present invention relates to a control device suitable for a gas turbine combined cycle power generation system equipped with a fuel gas heating device, a gas turbine combined cycle power generation system equipped with the control device, and a control method for the gas turbine combined cycle power generation system. Background technique [0002] In order to improve the efficiency of the equipment without reducing the output of the equipment when the exhaust heat recovery boiler of the double-pressure type is adopted, Patent Document 1 describes a combined cycle power generation equipment having a fuel gas heating equipment with : A pumping line that draws heating water from the heating water outlet of a medium-pressure economizer installed in an exhaust heat recovery boiler, a low-temperature fuel heating device that heats fuel gas used in gas turbine equipment using the heating water drawn through the pumping line, The pumping line that draws h...

AI Technical Summary

Problems solved by technology

Therefore, in the conventional gas turbine combined cycle power generation system as described in Patent Document 1, the temperature of the fuel gas does not rise sufficiently with respect to the load of the gas turbine, so that the MWI of the fuel gas does not fall within the range of the management value for combustion switching. Happening

[0012] In this case, it is necessary to increase the temperature of the heating water supplied from the exhaust heat recovery boiler, increase the temperature of the fuel gas, maintain the load of the gas turbine until the MWI of the fuel gas falls within the range of the management value, or reduce the load increase lag of the gas turbine, No matter which method is used, there is a problem that it is difficult to shorten the startup time of the equipment

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