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    Impact of a novel fuel additive containing boron and hydrogen on diesel engine performance and emissions
    (Taylor & Francis Inc, 2021) Simsek, Suleyman; Uslu, Samet; Sahin, Mukerrem; Arli, Fatih; Bilgic, Gulbahar
    In this study, diesel fuel was enriched with hydrogen and boron, which are used as environmentally friendly energy sources in recent years. A special fuel additive (octamix) was obtained by mixing ethanol, ammonia boron and trioctyl borate and the effects of octamix-diesel fuel blends on diesel engine responses were analyzed at different engine loads (from 500 W to 3000 W) and a constant engine speed (3000 rpm). Test fuels were prepared by adding 0.5% (0.5 OCT-D), 1% (1 OCT-D), 2% (2 OCT-D) and 3% (3 OCT-D) octamix into the diesel (100D) by volume. Brake thermal efficiency (BTE) increased while brake specific fuel consumption (BSFC) decreased with increasing octamix up to 1% percentage. With 1 OCT-D fuel, the maximum BTE was achieved as 26.2% at 3000 W load, while the minimum BSFC was 180 g/kWh at 2500 W load. An increase of 3.19% and a decrease of 18.18% were achieved, respectively, compared to the 100D. On the other hand, nitrogen oxide (NOx), carbon monoxide (CO), carbon dioxide (CO2), hydrocarbon (HC), and smoke emissions have been reduced by up to 1% octamix percentage. Compared to the 100D, a decrease of 15.66%, 46.67%, 23.63%, 24.24%, and 10.71% was achieved, respectively.
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    Investigation of Obtaining Natural Humic Acid From Asphaltites Commonly Found in Sirnak-Uludere Region
    (Gazi Univ, 2022) Taskesen, Edip; Acar, Sukru; Arli, Fatih; Dumrul, Hakan; Ertugrul, Gorkem; Bulbul, Saban; Ozcan, Emine
    The physical and chemical properties of asphaltites found in significant amounts in Sirnak and its surroundings are close to coal. But it differs from coal because of its formation sources and chemical processes. Asphaltites were separated from the oil in liquid state by tectonism and settled in other locations, hardened by chemical reactions during geological processes and turned into solid phase. Most of the heating need in the Southeastern Anatolia Region is met by asphaltites. However, it is a raw material with low calorific value, high content of ash, sulfur and moisture, and high potential to adversely affect air pollution.It contains nitrogen and humic acid that dissolves slowly in aqueous media and can be used as soil reinforcement. In this study, researches were made to obtain natural humic acid from the content of asphaltite samples taken from the mine reserve in Uludere district. In the experiments made with samples, the effects of pH changes, temperature changes, changes in mixing times, precipitation in KOH and HCl solution were investigated towards optimal humic acid recovery efficiency. Accordingly, natural humic acid was obtained with the highest efficiency of 33.95% as a result of the studies conducted with temperature experiments from the sample of the Uludere region.