NOx and CO gas emissions in collective transport buses to diesel S50 and S10 with EGR system added with dienitro.

This article is an experimental study conducted to evaluate the influence of the use of 0.15% dienitro on the diesel S50 and S10 with EGR (exhaust gas recirculation) system added with dienitro. The tests were performed with a gas analyzer directly on the exhaust of vehicles with engine speed of 1300 rpm. Measurements of CO and NOx gas emissions were carried out using a gas analyzer in S50 and S10 diesel buses with an EGR system from a company operating in the collective transport. Twenty measurements were performed without additives and twenty measurements with additivation in each bus, making it possible to calculate the average emission rate of CO and NOx, pollutant gases of toxic effect. The results showed that all additive fuels reduced NOx and CO emissions. This additive has a slight increase of 1 or 1.5 points in cetane number, low vaporization enthalpy (energy to vaporize), and high combustion enthalpy, i.e., dienitro increased cetane number, facilitating the start of combustion and reducing CO. On the other hand, a fuel that releases less energy during combustion consequently produces lower temperatures within the combustion chamber, i.e., additives with lower combustion enthalpy have lower NOx emissions.