COMPORTAMIENTO TERMODINÁMICO DE UNA TURBINA DE GAS USANDO ETANOL COMO COMBUSTIBLE

Abstract

In this work there are calculations for fuel requirements using natural gas and ethanol for a GE 61B gas turbine, evaluating the possibility of use ethanol in this kind of machinery. For better understanding, combustion analysis for natural gas was performance as a comparison point, calculating fuel and air requirements at the entrance and exit of the combustion chamber, obtaining the principal emissions for both, fuels at different temperatures and relationships air / fuel. Ideally calculations to a complete Joule-Brayton cycle, for the 4 main processes that have the cycle, began using design data designated by the manufacturer from his website. In that way, count with a thermodynamic basis to use in the work. Focus on the combustion turbine, setting the temperature at the entrance of the combustion chamber (T2) and varying the temperature at turbine inlet (T3). Afterward, using the temperatures resulted by the calculations, stoichiometric air / fuel ratio and mole fractions were found. Finally, varying air / fuel ratio at diverse mixtures, we got emissions for both fuels. We obtained the fuel requirements for natural gas and ethanol, note that ethanol, due to its lower calorific value, the amount of fuel is higher in order to obtain the required temperature. In terms of emissions, there was no convincing evidence that ethanol represents a minor emission source than natural gas, however, can be a good substitute because natural gas is considered as one of the cleanest fuels.