Determinación de la influencia de las variables de entrada en el rendimiento de un ciclo combinado de potencia mediante simulación.

Abstract

The present research aims to determine the influence of the input variables in a combined power cycle for the generation of electricity through the use of a simulator. For this, the minimum and maximum temperatures reached by each natural region of Ecuador were established, as well as the atmospheric pressure of said region, engineering calculations were made to know the value of the design variables, obtaining as follows: Air temperature at the combustion chamber outlet: 1963 C, temperature at the gas turbine outlet: 1179 C, exhaust gas temperature in heat exchanger: 488.5 C, steam flow rate by air flow: 0.17 kg/s, temperature and pressure at the inlet of the steam turbine: 1151 C and 450 psi of pressure, temperature at the outlet of the steam turbine: 121.3 C and a pressure of 30 psi. Followed the simulation with these variables taking into account the thermodynamic considerations, finally obtaining a combined power cycle that generates 899.2 Kw with a calculation base of 1 Kg / s of dry air, using methane as fuel reaching an efficiency of 50%. This efficiency increases as the air supply flow to the compressor is increased, and at a lower ambient air temperature. The most influential variables are: pressure and air temperature at the compressor intake, fuel used in the combustion chamber, compression ratio, fluid pressure at the entrance of the steam turbine, as well as its temperature, and fluid pressure upon entry of the heat exchanger.