Experimental Investigations on Emission Characteristics of Dual Fuel Mode Diesel Engine

Abstract

Diesel engines are highly efficient and rugged due to their high compression ratios and are widely used in transportation and agricultural sectors. The main disadvantages of diesel engines are that they emit higher particulate matter and NOx emissions. The ever increasing cost of crude petroleum products and strict regulation norms laid down on tailpipe emissions has necessitated search for suitable alternative and renewable fuels for diesel engines to operate in dual fuel mode . In the present work KME20 (20% karanja methyl ester - 80% high speed diesel) and Bio-CNG (enriched biogas) are selected as fuels to operate the diesel engine on dual fuel mode (DFM) at 0.3kg/h,0.6kg/h and 0.9kg/h flow rates of biogas. In this study it is found that the thermal efficiency (BTE), NOx and Smoke emissions are lower, CO and HC emissions are higher for dual fuel mode diesel engine when compared to diesel engine normal operation.