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Investigation of the Efficiency of a Cogeneration Gas Turbine Unit with Heat Recovery of Flue Gases in the Far North

The authors considered a cogeneration gas turbine unit operating on natural gas, with the possibility of the utilization of the heat of the flue gases. The mathematical model of a cogeneration gas turbine unit has been developed to perform one design calculation in the nominal mode and several verification calculations in characteristic modes with different thermal loads. optimization calculations were carried out for climatic conditions of Yakutsk and different prices for fuel. The optimal design parameters of the equipment, the parameters of the working fluid and coolants at all points of the technological scheme, fuel costs in each characteristic mode of operation were found by the criterion of the minimum price of electricity. The obtained results allow concluding about sufficient energy and economic efficiency. The creation of a mathematical model of a cogeneration gas turbine unit and optimization calculations were performed using a software package “Computer programming system” created at the Melentiev Energy Systems Institute SB RAS.