| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 97 === International oil price has been going up in recent years because of decrease of crude oil reserves. Therefore many countries have devoted to the research and development of alternative energies. Bio-diesel is one of the alternative energies that have been extensively discussed and studied. Many studies about the usage of bio-diesels have been conducted. However, very few researches were conducted to investigate the use of bio-diesels in electricity generators. In this study, tested fuels were prepared by mixing pure diesel oil (D100) with different percentage of waste edible oil biodiesel or soybean biodiesel, such as W10 (10% waste edible oil + 90% diesel), W20, W50, S10 (10% soybean + 90% diesel), S20, and S50. Different fuels were tested as the engine generated stable electricity (1800 rpm) to investigate the emission characteristics of PM, carbonaceous PM, Total-PAHs and the Total-Toxicity-Equivalency (Total-BaPeq). The results showed that compared to D100, the addition of soybean biodiesel or waste edible oil biodiesel at different percentages could reduce the PM emission factor efficiently under 0 kW, 1.5 kW, and 3 kW loads. The reduction of PM emission factor was 13.7–66.2% (average 31%) and 16.1–57.0% (average 35%) for waste edible oil biodiesel and soybean biodiesel, respectively. The reduction of PM emission factor was the highest as the bio-diesel addition was 20%. The PM emission factor decreased by 41.9% and 45.3% for W20 and S20, respectively. The addition of soybean biodiesel and waste edible oil biodiesel significantly reduced the emission factors of EC and OC on PM. The emission factor reduction of OC on PM was the highest as the bio-diesel addition was 20% (i.e., W20 and S20). As the addition of bio-diesel increased, the emission factor reduction of EC on PM significantly decreased, especially for the W50 and S50. The EC content of PM increased as the load was high (3 kW), despite of addition percentage. However, the OC content of PM decreased as the load was high. The emission factors of Total-PAHs and Total-BaPeq decreased as the bio-diesel addition percentage increased. The emission factors of Total-PAHs and Total-BaPeq decreased by 11.4–69.9% and 16.0–59.3%, respectively for waste edible oil biodiesel addition, while those of soybean biodiesel addition were 24.1–77.8% and 8.00–63.2%, respectively. The Brake Specific Fuel Consumption (BSFC) was lower as the load was higher, despite of percentage of bio-diesel addition. The BSFC was lower as the bio-diesel addition percentage was 20% (W20 and S20). As the load was medium (1.5 kW), the energy efficiency was higher for S10 and W10. However, As the load was high (3 kW), the energy efficiency was higher for W20 and S20.
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