Combustor Control Method and Combustor Controller

摘要

Provided are a combustor control method and a combustor controller capable of calculating the combustion air flow and the fuel flow in multi-shafts gas turbine with high precision and without the need of performing complicated calculations and thereby calculating a fuel-air ratio necessary for stable combustion control. The multi-shaft gas turbine is made up of a gas generator turbine and a power turbine. Combustors includes a diffusive combustion units and a plurality of premixed combustion units. An ignition/extinction control unit of the combustor control device calculates the combustion air flow supplied to the combustors based on the open position of compressor inlet guide vanes attached to the gas generator turbine, revolution speed of the gas generator turbine and compressor inlet temperature, calculates the flow of fuel supplied to the combustors based on revolution speed of the power turbine, and calculates the fuel-air ratio in real time as flame reference based on the calculated combustion air flow and fuel flow.