Potential use of a blend of diesel, biodiesel, alcohols and vegetable oil in compression ignition engines

In this work, diesel fuel was mixed with biodiesel, biodiesel–alcohol, and biodiesel–alcohol–vegetable oil blends using the basic alcohols of ethanol, methanol and butanol. The exhaust gas emissions of a small diesel generator running on different fuel blends were compared and the combined effects of alcohol–vegetable oil fuel blends were studied. Blend ratios used in this study were diesel–biodiesel (70–30%), diesel–biodiesel–alcohol (70–20–10%) and diesel–biodiesel–alcohol–vegetable oil (70–20–5–5%). As compared to diesel–biodiesel blends, diesel–biodiesel–alcohol and diesel–biodiesel–alcohol–vegetable oil blends increase CO and HC emissions while reducing NOx emission. It was also shown that adding vegetable oil to diesel–biodiesel–alcohol blends improved emissions All the tested fuel blends produced the highest difference in CO and HC emissions at no-load and the smallest difference at full-load.