Abstract:
The invention pertains to a power plant including a gas turbine, a heat recovery boiler arrangement with at least a boiler inlet, and an outlet side with a first exit connected to a stack and a second exit connected to a flue gas recirculation, which connects the second exit to the compressor inlet of the gas turbine. The heat recovery boiler arrangement includes a first boiler flue gas path from the boiler inlet to the first boiler exit, and a separate second boiler flue gas path from the boiler inlet to the second boiler exit. Additionally, a supplementary firing and a subsequent catalytic NOx converter are arranged in the first boiler flue gas path. Besides the power plant a method to operate such a power plant is an object of the invention.
Abstract:
The invention relates a method for operating a power plant with a single shaft gas turbine, in which the gas turbine is operated at a constant speed which is below the speed at which the gas turbine is turning when the first generator is synchronized to an electric grid. The proposed method ensures good stable combustion with low emissions, a high turbine exhaust temperature, and minimized fuel consumption.