本研究使用不同添加比例的生質柴油進行柴油引擎排放多環芳香烴(PAHs)特徵之研究，其中燃料油品包含石化柴油、生質柴油(包含黃豆油及棕櫚油)，控制添加比例皆為10%、20% 和30%，本試驗即利用非穩態型之美國暫態循環(US Transient Cycle)測試，包含冷啟動測試和熱啟動測試程序，針對每種燃料油之引擎排放廢氣中21種PAHs進行採樣及分析，分析儀器為GC/MS。
　　基礎石化柴油添加生質柴油後，會增加油品之十六烷指數，有利於提昇油品於柴油引擎中之燃燒效率，且會降低油品之含硫量，亦將降低柴油引擎硫氧化物之排放。油品中總PAHs含量，石化柴油為238 mg/L，在添加比例10%、20% 及30%，黃豆油分別為211、180及156 mg/L；棕櫚油則為199、152及151 mg/L。
　　基礎石化柴油引擎排放廢氣中總PAHs排放濃度為46.5 μg/m3，添加10%、20%及30%黃豆油後，分別為20.5、14.3與17.5 μg/m3，大致呈現減少趨勢，總PAHs削減率分別為55.9%、69.2%與62.3%。而添加10%、20%及30%棕櫚油後，分別為10.8、8.29與8.24 μg/m3，亦呈現減少趨勢，總PAHs削減率分別為76.8%、82.1%與82.3%。
　　柴油引擎制動馬力-小時之總PAHs排放係數，基礎石化柴油為5.59 μg/BHP-hr，添加10%、20% 和30%黃豆油後，分別為2.46、1.67和2.11 μg/BHP-hr，呈現降低趨勢，削減率分別為56.0%、70.1%和62.3%。添加10%、20% 和30%棕櫚油後，分別為2.36、1.82和1.82 μg/BHP-hr，亦呈現降低趨勢，削減率分別為57.8%、67.4%和67.4%。
　　柴油引擎單位耗油量之總PAHs排放係數，基礎石化柴油引擎排放總PAHs之排放係數為19.4 μg/L-fuel，添加10%、20% 和30%黃豆油後，分別降為8.44、5.82和7.02 μg/L-fuel，削減率分別為56.5%、70.0%和63.8%，添加10%、20% 和30%棕櫚油後，分別降為7.70、6.32和6.28 μg/L-fuel，削減率分別為60.3%、67.4%和67.6%。
　　在生質柴油添加對柴油引擎排放PAHs特徵之影響方面，添加生質柴油對引擎排放總PAHs濃度與排放係數都有削減效果，亦使總毒性當量與PAHs排放係數之BaPeq隨之降低。

　　The emission of PAHs (Polycyclic Aromatic Hydrocarbons) from the diesel engine on a dynamometer by varying different amount of bio-diesel adding in the fossil diesel was investigated. These fuels included fossil diesel、soybean bio-diesel and palm bio-diesel, for ten, twenty and thirty percentage of addition in fossil diesel. The engine was simulated for the US Transient Cycle condition that includes one cold start test and one hot start test. The samples with twenty one individual PAHs emitted from the engine powered by each fuel. The samples were analyzed by a GC/MS ( gas chromatography/mass spectrometer).
　　By adding bio-diesel in the fossil diesel, the cetane index of fuel will be increase. This will benefit to elevate the combustion efficiency; the other is the addition of bio-diesel can reduce the sulfur content of fuel, this will also decrease th SOx emission from the diesel engine. Varying different fraction of soybean bio-diesel, by 0%, 10%, 20% and 30%, the PAH contents in the fuel are 238, 211, 180 and 156 mg/L, respectively. In addition, the PAH contents in the fuel will reduce to 199, 152 and 151 mg/L by varying 10%, 20% and 30% palm bio-diesel in the fuel, respectively.
　　The emission index of total-PAHs concentration of the fossil diesel is 46.5 μg/m3, and decrease to 20.5, 14.3 and 17.5 μg/m3 by varying soybean bio-diesel of 10%, 20% and 30%, respectively. In addition, the emission is reduced to 10.8, 8.29 and 8.24 μg/m3 by varying palm bio-diesel of 10%, 20% and 30%, individually.
　　As the emission factor per hour brake horse power of diesel engine, the fossil diesel is 5.59 μg/BHP-hr, and decrease to 2.46, 1.67 and 2.11 μg/BHP-hr by varying soybean bio-diesel of 10%, 20% and 30%, individually. Furthermore, the total-PAH emissions are reduced to 2.36, 1.82 and 1.82 μg/ BHP-hr by varying palm bio-diesel of 10%, 20%, and 30%, repectively.
　　However, the emission factor of total-PAHs per liter fuel consumption of diesel engine, the fossil diesel is 19.4 μg/L-fuel, and decrease to 8.44, 5.82 and 7.02 μg/L-fuel by varying soybean bio-diesel of 10%, 20% and 30%, individually. Furthermore, the total-PAH emissions are reduced to 7.70, 6.32 and 6.28 μg/L-fuel by varying palm bio-diesel of 10%, 20%, and 30%, repectively. In conculsion, more bio-diesel content not only decrease PAH content in the fuel, but also reduces the PAH emissions from the exhaust of diesel engine.
　　The result of this study showed that the addition of bio-diesel in fossil diesel not only reduced the total-PAH emission concentration and emission factor of the diesel engine, but also decreased the emission factor of BaPeq.

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