Abstract:
Engineers have proposed various solutions towards reducing pollutant emissions, especially nitrogen
oxides (NOX), from indirect injection diesel engines. The aim of the present work is to investigate the influence
of exhaust gas recirculation (EGR) rates on Jatropha biodiesel (JB), diesel and their blends. A indirect
injection (IDI) diesel engine was tested by diesel,100% biodiesel (JB100), blends of 20% diesel and 80%
biodiesel ( JB80) ,and other blends like JB60, JB40,and JB20. The engine characteristics with Jatropha
biodiesel were compared against those obtained using diesel fuel. From the results, it is observed that the
biodiesel performance and emission are lower than that of diesel fuel. However, the NOx emission of Jatropha
biodiesel is more than that of diesel fuel. The EGR system reduces NOX emissions by recirculation small
amount of exhaust gases into the intake manifold. The main focus of this dissertation is on finding out the best
or the most suitable blend of biodiesel which when used gives out least automotive NOx emissions using a EGR
sysrem. A single cylinder water cooled IDI diesel engine was used for investigation. Smoke , NOx ,CO, CO2
emissions were recorded and various engine performance parameters were also evaluated . The results and
discussion based on the effect EGR system on engine performance and emission characteristics of JB20, JB40,
JB60, JB80, JB100 and diesel fuel without EGR rates and with EGR rates. The performance parameters and
NOx emissions are measured and recorded for diesel fuel and JB and their blends. The results showed that, at
15% EGR diesel, JB 20 at 25% EGR, JB 40 at 15% EGR, JB 60 at 20% EGR, JB 80 at40% EGR, and JB 100
at 5% EGR, the NOx emissions are effectively reduced by 10.1%,11.94%,13.4%,15.2%,19.85%, and 24.8%
respectively.
