Effects of Low Carbon Biofuel Blends with Karanja (Pongamia pinnata) Oil Methyl Ester in a Single Cylinder CI Engine on CO2 Emission and other Performance and Emission Characteristics

摘要

The present study investigates the effects of various low carbon biofuels on CO 2 emission and otherperformance and emission characteristics blended with Karanja oil methyl ester (KOME) in a singlecylinder CI engine with a rated output of 5.2 KW at 1500 rpm. Carbon-di-oxide (CO 2 ) emission is a majorthreat to the environment as it causes global warming. The constant depletion of fossil fuels over theyears has changed the focus of researchers towards biofuels. The number of carbon atoms in themolecular structure and carbon to hydrogen ratio of biofuel is one of the major causes for the increasein CO 2 emission. Karanja (Pongamia pinnata) oil is available in plenty in India, and hence it may replaceconventional diesel fuel largely. However, KOME operated CI engine emits higher CO 2 emission due tohigher carbon content compared to diesel. Blending of low carbon biofuel with KOME reduces CO 2emission. Low carbon biofuels like Eucalyptus oil (EU), Pine oil (PO), Camphor oil (CMO) and Orange oil(ORG) were selected for this study and blended equally with KOME on volume basis. Performance,emission and combustion parameters for all the blends were tested at part and full load conditions andcompared with neat diesel and neat KOME. CO 2 emission was lesser for all the low carbon biofuelblends with KOME. Maximum reduction of 13% was observed with KOME-ORG blend compared toneat KOME and 6% reduction of CO 2 emission for KOME-ORG blend compared to neat diesel at full loadcondition. A slight increase in brake thermal efficiency is observed for KOME-ORG compared to neatdiesel and neat KOME with a slight increase in NO and CO emission at full load condition. With anincrease in brake thermal efficiency and reduction in CO 2 emission, equal blending of KOME-ORG is thebest among the various blends tested, in terms of performance, emission and combustion parameterscompared to neat diesel and neat KOME.