Increase in energy demand, stringent emission norms and depletion of oil resources have led the researchers to find alternative fuels for internal combustion engines. On the other hand, waste oils pose a very serious environment challenge because of their disposal problems all over the world. In this context, waste oils are currently receiving renewed interest. The properties of the oil derived from waste plastics, cooking and engines oils were analyzed and compared with the petroleum products and found that it has properties similar to that of diesel. This paper gives a brief review about using waste oil of these three types of oil as a fuel for diesel engines. The conversion process of each type of waste oil is presented. The results obtained from the experimental studies on a diesel engine are discussed.
Key words: Waste oil, cooking, plastic, conversion, fuel, engine
ATDC, Before top died centre; Bsfc, break specific fuel consumption; Bmep, break mean effective pressure; CA, Crank angle; DF, diesel fuel; DLF, diesel-like fuel; FFA, free fatty acid; GLF, gasoline-like fuel; PM, particulate matter; Rpm, revolution per minute;SI, spark ignition; THC, total hydrocarbons; UCO, used cooking oil; WPO, waste plastic oil;WCO, waste cooking oil; WEO, waste engine oil; WEO100, pure (100%) waste engine oil;WEO75, mixture of 75% WEO and 25% diesel fuel; WEO50, mixture of 50% WEO and 50% diesel fuel
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