Influence of EGR on the simultaneous reduction of NO_x-smoke emissions trade-off under CNG-biodiesel dual fuel engine

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Dwindling fossil fuel resources and deteriorating ambient air quality has mandate the search for suitable alternative fuels for diesel engine. Dual fuel engines show remarkable engine performance characteristics at higher engine loads but suffer from high NO<SUB>x</SUB>-smoke opacity emissions trade-off. In the present study, an attempt has been made to introduce exhaust gas recirculation (EGR) under compressed natural gas (CNG) fuelled diesel engine using Jatropha biodiesel (B20) blend as pilot fuel. Experimental investigations were carried out in a single cylinder direct injection compression ignition engine, which was suitably modified to operate under dual fuel mode along with EGR. Comparative analysis was made on the basis of combustion, performance and emissions characteristics at different engine operating loads for fossil diesel, CNG and biodiesel blend (B20) with and without EGR. It was evident from the experimental investigations that dual fuel mode with EGR improved the NO<SUB>x</SUB>-smoke emission trade-off at higher engine loads without deteriorating engine combustion and performance characteristics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CNG and Biodiesel is used under dual fuel mode. </LI> <LI> EGR is effective in curbing NO<SUB>x</SUB> emissions. </LI> <LI> Smoke emission decreases with EGR. </LI> <LI> Drop in brake thermal efficiency under dual fuel mode. </LI> </UL> </P>