Document Type : Original Article

Authors

1 Department of Agricultural Mechanization, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Biosystems engineering, Science and Research branch, Islamic Azad University, Tehran, Iran.

3 , Department of Agricultural Mechanization, Science and Research Branch, Islamic Azad University, Tehran, Iran

10.22092/amsr.2026.372709.1535

Abstract

In this study, the non-edible oilseed of the Bassia scoparia plant was introduced as a raw material for biodiesel production and the effect of the resulting biodiesel on the emission of pollutants from a diesel engine was investigated. After purification of Bassia scoparia seeds, oil extraction was performed. In order to investigate the emission of pollutants, an air-cooled single-cylinder engine was used. Emission tests were conducted to determine the effects of engine speed, load, and fuel composition on carbon monoxide, carbon dioxide, unburned hydrocarbons, and NOX using an exhaust gas measurement system. The experiments were conducted at three engine speed levels (1800, 2100 and 2400 rpm), five load levels (0, 25, 50, 75 and 100 percent) and five different biodiesel ratios (B0, B5, B10, B15 and B20). 25 percent load was chosen as a stable and conventional operating condition in the low-load region to allow for the evaluation of the independent effect of engine speed on pollutants. In order to investigate the effect of independent variables on dependent variables, analysis of variance with a completely randomized experimental design was used. The findings of this study showed that engine operation at a constant load of 25 percent and a rotational speed of 2100 rpm, when using a blend containing 15 percent biodiesel, significantly improved the emission indices. Under the same conditions, the highest reduction in carbon monoxide was 17.65% compared to pure diesel. Also, the highest reduction in unburned hydrocarbons was 63.35% and the highest drop in nitrogen oxides was 35% for the same mixing ratio.

Keywords

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