為瞭解柴油引擎發電機不同負載下使用石化柴油(Fossil diesel，即D100)及石化柴油中添加廢食用油生質柴油(Waste cooking oil-based biodiesel，簡稱WCO-Biodiesel)時，對排氣細微粒(Fine particulate matter，以PM2.5表示)及PM2.5上不同型態碳成分之影響，本研究發電機引擎在1.5 kW及3.0 kW負載下使用D100中分別添加20%及40% WCO-Biodiesel之混合生質柴油(即W20、W40)，以探討其排氣PM2.5及PM2.5上全量部分(Entire Fraction，以E-表示)、酸雨部分(Acid-Rain Fraction，以A-表示)及水溶性部分(Water-Soluble Fraction，以W-表示)等不同型態碳成分特性。
研究結果顯示：發電機引擎兩負載下使用D100、W20及W40時，排氣PM2.5中所測3種不同型態TC質量濃度之大小依序為 E-TC (平均15.3 mg/Nm3) > A-TC (平均7.14 mg/Nm3) > W-TC (平均5.92 mg/Nm3)；排氣PM2.5濃度約有88.2%是由E-TC貢獻，其中E-EC為E-OC之2.97倍。與D100相較，兩負載下使用W20及W40時均可降低其排氣PM2.5質量濃度及PM2.5上E-TC、E-OC及E-EC濃度；且PM2.5濃度之減量均以W20時(平均23.5%)較多，而E-OC濃度之減量(平均31.2%)較E-EC值(平均12.8%)高。與D100相較，兩負載下使用W20及W40時大致上可進一步降低其排氣PM2.5上全量、酸雨及水溶性等3種不同型態碳成分之濃度；兩負載下使用D100、W20及W40各油品時，其PM2.5上TC、EC及OC之濃度與含量均以全量之值最高。

This study investigates the emission characteristics of PM2.5 and three kinds of PM2.5-bound carbonaceous contents (entire (E-), acid-rain (A-), and water-soluble (W-) fractions) by utilizing several diesel and waste cooling oil-based biodiesel (WCO-Biodiesel) blends as the fuels of a diesel engine generator. The diesel-WCO-Biodiesel blends were prepared by adding 20% and 40% of waste cooking oil-based biodiesel into to fossil diesel to form W20 and W40, respectively, and they were used as fuels in a diesel fuel engine generator operated at 1.5 and 3.0 kW loads.
The results show that the concentrations of carbonaceous contents in the engine emission PM2.5 were in the order E-TC (15.3 mg/Nm3 in average) > A-TC (7.14 mg/Nm3 in average) > W-TC (5.92 mg/Nm3) when using D100, W20, and W40. The E-TC accounted for 88.2% of PM2.5 mass emission, while the E-EC content was 2.97 time that of E-OC. In comparison with using D100, the mass concentrations of PM2.5 and PM2.5-bound E-TC、E-OC, and E-EC could be reduced when using W20 and W40. The highest reduction of PM2.5 (23.5%) was achieved by using W20, while a more reduction ratio was found for E-OC (31.2% in average) than for E-EC (12.8% in average). This study shows that using W20 and W40 could reduce the emissions of PM2.5-bound E-TC, A-TC, and W-TC from the generator. The entire fraction (E) was the highest among the three carbonaceous contents (E-, A-, and W-) for all the TC, EC, and OC measurements.

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