Improving the Combustion Process of Biofuels for Diesel Engines to Reduce Environmental Pollution

Limiting environmental pollution from exhaust emissions from internal combustion engines includes many measures, including encouraging biofuel use because biofuel is environmentally friendly and renewable. A mixture of diesel fuel and vegetable oil is a form of biofuel. However, some properties of the mixed fuel, such as viscosity and density, are higher than those of traditional diesel fuel, affecting the injection and combustion process and reducing power and non-optimal toxic emissions, especially soot emissions. This study uses Kiva-3V software to simulate the combustion process of a diesel-vegetable oil mixture in the combustion chamber of a fishing vessel diesel engine with changes in fuel injection timing. The results show that when increasing the fuel injection timing of a diesel-vegetable oil mixture about 1–2 degrees of crankshaft rotation angle before the top dead center compared to diesel fuel injection timing, the engine power increases, and soot emissions decrease compared to no adjustment. The above simulation research results will help orient the experiments conveniently and reduce costs in the future experimental research process to quantify the fuel system adjustment of fishing vessels' diesel engines when using biofuels, including diesel-vegetable oil mixtures. Thus, the engine's economic indicators will improve, and emissions that pollute the environment will be limited.