Прегледај по Аутор "Ðurić, Slavko"

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    Experimental Analysis of Temperature Influence on Waste Tire Pyrolysis
    (MDPI, 2021) Čepić, Zoran; Mihajlović, Višnja; Ðurić, Slavko; Milotić, Milan; Stošić, Milena; Stepanov, Borivoj; Ilić Mićunović
    Pyrolysis is an optimal thermochemical process for obtaining valuable products (char, oil, and gas) from waste tires. The preliminary research was done on the three groups of samples acquired by cutting the same waste tire of a passenger vehicle into cylindrical granules with a base diameter of 3, 7, and 11 mm. Each batch weighed 10 g. The heating rate was 14 C/min, and the final pyrolysis temperature was 750 C, with 90 s residence time. After the pyrolysis product yields were determined for all of the three sample groups, further research was performed only on 3 mm granules, with the same heating rate, but with altered final pyrolytic temperatures (400, 450, 500, 550, 600, 650, 700, and 750 C). The results of this study show that thermochemical decomposition of the waste tire sample takes place in the temperature range of 200–500 C, with three distinct phases of degradation. The highest yield of the pyrolytic oil was achieved at a temperature of 500 C, but further heating of volatile matters reduced the oil yield, and simultaneously increased the yield of gas, due to the existence of secondary cracking reactions. The analysis of pyrolytic oil and char showed that these products can be used as fuel.
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    Experimental Testing of Combustion Parameters and Emissions of Waste Motor Oil and Its Diesel Mixtures
    (MDPI, 2021) Ðorđić, Dragiša; Milotić, Milan; Ćurguz, Zoran; Ðurić, Slavko; Ðurić, Tihomir
    The production of hydrocarbon fuel from waste engine oil is an excellent way to produce alternative fuels. The aim of the research in this paper is obtaining fuel with a mixture of waste engine oil (WMO) and diesel fuel that can be used as an alternative fuel for internal combustion engines and low power heat generators. With this goal in mind, tests were conducted to estimate the combustion parameters and emissions at a low heat output of 40 kW.Waste motor oils (WMO) and four of its diesel mixtures were used, varying in weight from 20% WMO to 50% WMO. Test results were analysed and compared with diesel fuel. Higher NO, CO and CO2 emissions were determined for WMO and its mixtures compared to diesel fuel. The flue gas temperature in the kiln was high for all WMO and diesel blends, which indicates the efficiency of the input energy. The absorption of flue gases in the scrubber with distilled water showed higher presence of sulphates, sulphides, nitrates and nitrites compared to allowable values.