Abstract
Exhaust gas recirculation (EGR) is the most effective and practical method for reduction of NOx emission in Internal Combustion Engines. However, improper application of EGR in the engine causes higher power loss, excessive specific fuel consumption (SFC) and an increase in the concentration of other pollutants. For this reason, the amount and temperature of EGR must be tailored for each engine in order to get optimum performance and emission results. In this research work, after comparison of hot and cooled EGR for an S-I engine, pollutant behavior has also been studied around Dew point temperature of exhaust gasses. Results indicate that the pollutant’s behavior depend on the EGR mixture (amount and temperature), thermal capacity of EGR and amount of water condensation. For example, when the amount of EGR is 10% there is a higher reduction of NOx with ignorable power loss. Results also showed that the optimum temperature in experimental conditions and in this particular engine is about 340–343 Kelvin, which is just above the Dew point of exhaust gases.
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