article · Energy Sources Part A Recovery Utilization and Environmental Effects
This study evaluated the performance and emission characteristics of a compression ignition diesel engine running on blends of commercial diesel and polanga oil biodiesel. Tests examined fuel blends containing 0, 10, 20, 30, and 40 percent biodiesel under varied fuel injection pressures and timings. Thermal performance decreased proportionally as the concentration of biodiesel in the blend increased. Among the mixtures tested, a 20 percent biodiesel blend performed most similarly to conventional diesel. Advancing the injection timing to between 27 and 31 degrees before top dead centre minimised emissions of carbon monoxide, unburnt hydrocarbons, carbon dioxide, and smoke. The best overall results, yielding minimal emissions, occurred at an injection pressure of 240 bar and an injection timing of 31 degrees before top dead centre. Blends up to 20 percent improved engine performance and lowered emissions without requiring engine modifications.
Identifying alternative fuels that function in existing diesel engines without mechanical modifications helps reduce reliance on fossil fuels. This research shows that blending up to 20 percent polanga biodiesel can cut harmful emissions while maintaining performance comparable to conventional diesel, provided injection settings are appropriately tuned.
This work demonstrates an applied and tested approach relevant to biofuel blenders and diesel engine operators. It enables the use of up to 20 percent polanga biodiesel in standard compression ignition engines without retrofits, provided fuel injection pressure and timing are calibrated to 240 bar and 31 degrees before top dead centre to minimise emissions.
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To evaluate the performance and emissions of a diesel engine fuelled by biodiesel blends produced from polanga oil, the engine was run to investigate the effects of injection pressure and timing on engine operation with varying biodiesel blends concentrations. Consequently, commercial diesel fuel blended with different polanga biodiesel in different percentages (0%, 10%, 20%, 30%, and 40%). The average reduction in the thermal performance of the biodiesel fuels, was reduced proportionally with the biodiesel blends. B20 blend operates closest to that of diesel oil whereas, the engine operated with any higher injection timing, ranging from 27 to 31° bTDC, the emission constituents of CO, UHC, CO2, and smoke are the least and remains constant in the injection timing between 27 to 31°bTDC. Polanga based biodiesel blends provide a better result at an injection timing of 31°bTDC and injection pressure of 240 bar leading towards minimum emission. Up to 20% polanga biodiesel blends improvement in the engine performance and reduction in the emissions was observed without any modifications to CI engine.
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DOI: 10.1080/15567036.2019.1583696
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