Effects of Emulsion Fuels on the Characterization of Energy Efficiency and Exhaust from a Diesel Engine Generator

• Main Authors: Jin-Yuan Syu, 許晉源
• Other Authors: 林文印
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/22cz2b

碩士 === 國立臺北科技大學 === 環境工程與管理研究所 === 98 === Emulsion fuel is a possible alternative fuel for reduction of diesel engine emissions. Using water/diesel emulsion fuel as a fuel can reduce the emissions of nitric oxide and particulate matters of the exhaust. However, few researches have been carried out on the particle number concentration and energy efficiency from high speed light-duty diesel engine generator fueled with water/diesel emulsion fuel. In this study, an ultrasonic vibrator that provides ultrasonic waves of a 40-kHz frequency was employed to prepare different water/diesel emulsion fuels (W5S5; W5S10; W10S5; W10S10; W10S15; W15S5; W15S10). In this thesis, the measurement system consisted of a high speed light-duty diesel engine generator, Electrical Low-Pressure Impactor (ELPI), Vehicle Emission Gas Analyzer (BE-1000), Loading, and Fuel Consumption Measuring Device. Super diesel and different W/O emulsion diesel fuels were used to study the effects of different loadings on the characterization of exhaust from a diesel engine generator. The results showed that the exhaust gas temperature was increased as generator loading was increased. However, it was decreased as the water content of emulsion diesel fuel was increased. When the loading was less than 2700 watts, the number concentration might increase and the count mean diameter was decreased as loading was increased. However, as loading was above 3600 watts, the number concentration was decreased and the count mean diameter was increased. The total number concentration was 1.42×108#/cm3 and count mean diameter was 70 nm by using super diesel. However, the total number concentration was decreased to 1.62×107#/cm3 and the count mean diameter was increased to 85 nm by using W15S5 emulsion fuel. Besides, the NO emission was decreased from 1530 ppm (Super diesel) to 870 ppm (W15S10 emulsion fuel). Furthermore, the particle count mean diameter was increased as water content was increased as loading was above 3600 watts. Flame temperature was reduced as increasing water content of W/O emulsion fuel. It could reduce NO emissions about 15 to 40 % when the loading was 3600 watts. Nevertheless, as the percentage of water in the emulsion was increased the amount of emitted CO and HC was increased. Furthermore, mixing-fuel consumption was increased. However, the net diesel fuel consumption was decreased. As a result, using W/O emulsion fuel can increase the engine thermal efficiency by 12 to 34 %.