Influence of hydrogen enrichment on the combustion, efficiency and emissions of dual fuel engine

The objective of this work is to investigate performance, combustion and emission characteristics of dual fuel engine fueled with CNSO biodiesel as pilot fuel and hydrogen as the primary fuel. CNSO was chosen for biodiesel production due to its properties similar to those of diesel. The produced biodiesel was blended with diesel in the volume fraction of 20% and 30%. Hydrogen was chosen as primary fuel due to its superior combustion properties and it was inducted along with air during the suction stroke at flow rates of 5(H5), 10(H10), 15(H15) Liter Per Minute (LPM). From the experimental results, it was inferred that biodiesel blends resulted in poor performance, inferior combustion along with stringent CO2 emission. However, it was overcome by hydrogen enrichment. Carbon monoxide (CO), Hydrocarbon (HC), Carbon-di-Oxide (CO2), emissions were dramatically reduced in the case of Hydrogen enriched biodiesel blend compared to neat biodiesel because of zero-carbon content in hydrogen. Nitrogen Oxide (NO) emission increased significantly with hydrogen enrichment due to higher combustion temperature. Significant improvement in brake thermal efficiency was observed for hydrogen enriched diesel and biodiesel. Brake specific fuel consumption was significantly reduced for hydrogen enrichment.As a final point, this study abstracts the optimized biodiesel blend and optimized hydrogen enrichment to enhance the performance of the engine.