Studies on compatibility of tyre pyrolysis oil as fuel for diesel engine
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Date
2017-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The development of alternative renewable liquid fuel has become nowadays necessity for better economy of the country and saving the environment from further deterioration. The pressure of increasing fuel prices, deteriorating global supplies of crude oil demand an urgent need of finding alternative resources. The studies were conducted to assess the performance and combustion characteristic of a CI engine on formulated fuels. Eight different fuel blends were prepared by blending high speed diesel and ethanol with distilled refined tyre pyrolysis oil in 10, 20, 30, 40, and 5, 10, 15 and 20 % ratio, respectively. The distilled refined tyre pyrolysis oil was obtained by acid treatment with different levels of H2SO4 and distillation after the moisture removal. The fuel properties like relative density, kinetic viscosity, high heat value, ash content, carbon residue, flash point, fire point, pH and copper strip corrosion were studied at every stage of refining process like initial, acid treatment, distillation and blending and compared with high speed diesel to check its suitability as fuel in CI engine. The performance of multi cylinder CI engine in terms of brake mean effective pressure, brake power, brake specific fuel consumption, fuel consumption, air-fuel ratio, heat input, heat equivalent to brake power, heat carried away by water jacket, heat carried away by exhaust gas and heat un-accounted was compared on high speed diesel as well as selected fuel blend to assess their suitability as engine fuel. The observed results of the experiment indicate that the raw tyre pyrolysis oil contain 10 to 14% moisture. Also there was improvement in the fuel properties by acid treatment but high concentration of acid resulted in low pH of the sample. Hence, acid concentration up to 6% level was most effective. It was also observed that after distillation there was also improvement in the fuel properties because of removal of suspended contaminants. It was also observed that there was positive effect of blending the distilled refined tyre pyrolysis oil with high speed diesel and ethanol which shows the non-significant differences in fuel properties. It was also clear from the performance of engine on high speed diesel blend with refined tyre pyrolysis oil that engine had similar power producing capacity from all blend compared to the diesel. The brake specific fuel consumption on blended fuels was higher than diesel. The air-fuel ratio of blends was found much lower than that of diesel at high load which indicate the poor combustion. Also, in case of ethanol engine developed same power on blends as well as diesel on all load conditions. The fuel consumption of engine increases with increase in anhydrous ethanol in blend. The air-fuel ratio was lower than diesel at all load condition. Hence, it required combustion booster as an additive and certain change in injection timing to allow more time for combustion of fuel.
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