Effect of Hydrogen Enrichment on the Performance and Emissions of a Complete Bio-Fueled Diesel Engine

Abstract

Esters of vegetable oil by esterification and bio oil produced by pyrolysis of various biomass resources have greater scope as alternative fuels for the future in power and transportation sectors. Experiments were conducted to evaluate the performance and emission parameters of a compression ignition engine on a dual fuel mode. Hydrogen was inducted in small quantities in a diesel engine whereas an emulsion of bio-oil and methyl ester of karanja was injected into the cylinder as a main fuel. The results were compared with diesel fuel operation and presented in this paper. The percentage increase in the brake thermal efficiency was 11.8%, 27.6% and 34.4% for WPO-MEK without hydrogen operation, WPO-MEK with 2lpm of hydrogen and WPO-MEK with 4lpm of hydrogen respectively at full load. The BSEC is 2.5% higher for WPO-MEK operation when compared to diesel. In case of WPO-MEK with hydrogen 2lpm and 4lpm, the BSEC values reduced by 18.7% and 29.3% respectively. There is about 51.2%, 64.4% and 72% increase in NO emissions for WPO-MEK, WPO-MEK with 2lpm, 4lpm of hydrogen induction respectively. Smoke density decreases by 14.6%, 26.2% and 31% respectively for WPO-MEK, WPO-MEK with 2lpm, 4lpm of hydrogen induction.