| Summary: | 碩士 === 國立臺灣海洋大學 === 輪機工程系 === 93 === Abstract
There are at least several hundred millions used lubricating oil from vehicles every year in Taiwan. If used lubricating oil which is composed of molecules not to be easily broken down could be recycled and refined, not only the impact of this kind of oil on environment would be refined, but the economic benefit achieve. Used lubricated oil is generally refined to produce base oil of lubricating oil. This study purported to improve previous refining technologies to enhance fuel properties of the recycled oil. Two steps of distillation at atmospheric pressure, washing with acidic and alkaline solutions successively, and after-treatment were used in the refining process. Six liters of re-used oil, two liters of light oil and two liters of heave residual oil were produced for every 10 liters of the used lubricating oil when our refined process was applied. Hence, about 80 % used lubricated oil can be refined to be fuel oil. The re-used oil like transparent and golden-yellowish in color. Most of the fuel properties of the re-used oil are superior to those of supreme diesel fuel, such as higher heating value, higher flash point, higher cetane index while much lower carbon residue after being burnt in a combustor. Hence, the re-used oil can be used in diesel vehicles to reduce carbon deposit and enhance heat transfer of the engines and to increase greatly the engine efficiency as well.
The re-used oil was also tested for engine performance and emission characteristics. Lower fuel consumption rate and lower carbon monoxide emission, larger exhaust gas temperature and higher combustion efficiency than supreme diesel fuel were found primarily due to its larger heating value and other superior fuel properties. Hence, the re-used oil from the refining process of this study has been found to have splendid fuel properties.
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