Abstract
The technology of gas-steam turbine combined cycles is once of the most viable options for the generation of electric power with lower costs of production per kilowatt-hour and environmental, considering that the type of fuel should be gas natural. In the Mexican Republic, the projections of power generation to 2018 through the use of this technology, it establishes the possibility to install new power generation plants with pressures of 100 to 160 bar, and temperatures of 538 to 580°C. Another option it’s the repowering of the thermoelectric plants and cogeneration gas-steam turbines projects. Therefore, in this paper present a thermodynamic analysis of the configurations of combined cycles of one, two and three pressure levels with the objective in order to establish a parametric analysis of the power generation capacity, as well the thermal efficiency and Heat Rate based on the characteristics of the gas and steam turbines, likewise the quality of the last expansion stage has considered as a restriction to delimit the pressure of the steam domes of each level.
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