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Controlling the Temperature of Combustion Products in Power Plants

The paper describes a new method for determining the temperature of combustion products (CP) of fuel used in combined cycle plants (CCGTs) and steam turbine units (STUs) with their own fuel preparation and combustion system. The method is based on the use of reliable reference data on the thermophysical the CP properties for obtaining correlation dependencies of the individual true enthalpies of the Cp components in the form of polynomials. The application of the method of inversion of polynomials made it possible to obtain in explicit form the relation for the adiabatic CP temperature, which is easily extended to theoretical and balance temperatures. Based on the example of CP fuels of three aggregate states, it is shown that the method can be used to control the process of formation of nitrogen oxides in combustion chambers of gas turbine units (GTUs) and boiler furnaces of STU.