Estudo da combustão com adição de hidrogênio em motor a diesel

Abstract

The theoretical study of internal engine combustion, diesel fueled in dual fuel mode, with hydrogen as secondary fuel, allows the behavior analysis of hydrogen with liquid hydrocarbon and hydrogen influence properties about performance, combustion and emission. In order to accomplish this study, a routine calculations was developed which, from the input data provided by the user, generates the air-fuel ratio on a mass basis, equivalence ratio, enthalpy of combustion, lower heating value and the mole fraction of the reaction products. In the present work, the routine calculations output data results of stoichiometric combustion reaction in diesel and hydrogen, rich combustion reaction in diesel and hydrogen (simbolo = 0,80) and lean combustion reaction in diesel (Simbolo = 1,10), both related with the load, in other words, the amount of power or torque required of an engine. By means of the routine calculations output data it is observed a decrease in theoretical thermal efficiency for stoichiometric mixture in diesel and rich mixture in diesel and hydrogen, as the energy sharing of hydrogen is increased, and an increase for a lean mixture in diesel and rich in hydrogen. The emission of carbon dioxide (CO2) decreases for the three mixtures analyzed and the emission of carbon monoxide (CO) increases for a rich mixture in diesel and hydrogen as the energy sharing of hydrogen is increased.