Experiment Study On Viscosity Reduction And Engine Test Of Waste Cooking Oil, Acidic Oil Biodiesel

As a kind of green renewable energy resources, the development of biodiesel to mitigate the shortage of energy supply, reduce environmental pollution is of great significance. Though study on biodiesel is especially hot at home and aboard, most of them focus on biodiesel preparation technology and have few researches on reducing viscosity of biodiesel. This research topic mainly does some experimental researches on reducing viscosity problem (especially waste cooking oil), power performance and fuel economy of biodiesel.In this topic, some methods such as ultrasonic wave method, magnetic field method and ethanol added method were introduced to reduce viscosity of waste cooking oil biodiesel and acidic oil biodiesel. By means of changing acting frequencies, strength and acting time of ultrasonic wave to reduce viscosity, the results indicated that the maximum viscosity reduction rate was 8.3% for acidic oil biodiesel while 13.2% for waste cooking oil biodiesel. Optimal combinations of parameters were acting frequencies (1.25MHz), strength 45W/cm2 and 17min acting time. By keeping biodiesel in mutual attraction and mutual exclusiveness magnetic field respectively, the results showed that mutual exclusive magnetic field had an obvious effect on reducing viscosity with the maximum viscosity reduction rate of 16% to acidic oil biodiesel and 26% to waste cooking oil bildiesel. Meanwhile, Results showed that the holding time was 5h with the effect of magnetic treatment. By mixing a certain amount of ethanol with waste cooking oils biodiesel homogeneously, the results of Ethanol added method showed that by adding 5%, 10% and 20% amount of Ethanol, the corresponding of viscosity reduction rate were 26.5%, 29.4% and 32.7% for acidic oil biodiesel while 35.7%, 43.8% and 49.6% for waste oil biodiesel.To research power performance and fuel economy of biodiesel, the engine tests were conducted by adopting blended fuel which was composed of acidic oil biodiesel and number 0 petroleum diesels with different blending proportions. Blended fuel composed of acidic oil biodiesel and ethanol with different blending proportions was also adopted to do the same engine tests. The outer characteristic test was done before no engine modification was made. Measured corresponding power, torque, fuel consumption rate, soot emission respectively. The results showed that optimal blended ratio of acidic oil biodiesel and number 0 petroleum diesel was B30 by considering power performance, fuel economy and soot emission comprehensively. Meanwhile, the optimal blended ratio of acidic oil biodiesel and ethanol was E5B95.