The Emissions of Polycyclic Aromatic Hydrocarbons from a Direct Injection Diesel Engine Using Biodiesel
Date Issued
2005
Date
2005
Author(s)
Hsu, Cheng
DOI
zh-TW
Abstract
Nowadays mobile source was always the major cause of air pollution producing, diesel engine especially. In this work, a direct injection diesel engine using different fuels, low sulfur diesel and pure biodiesel, was operated under different conditions and the emission which contained different types and different concentrations of polycyclic aromatic hydrocarbons (PAHs) was collected, extracted and analyzed. The result showed that at the 100% throttle, the maximum PAHs emission diesel occurs when engine is operated at the maximum torque,and using the low sulfur diesel. It also showed that the majority of exhaust is low molecular weight PAHs when the engine was at low speed range operation.The exhaust of mutation and carcinogen PAHs compounds and the most toxic BaP have the trend of increasing on high rotating speed. Apparently the concentration of Phe was higher than other compounds in emission and Nap and Pyr were usually in the majority in the remained compounds.
When biodiesel was used, the result revealed that maximum torque of diesel engine was operated at full load exhausted the maximum mass concentration of PAHs. The result showed that after biodiesel was used, the concentration of carcinogens would decrease obviously, and the amount of PAHs also decreased, but less than the former. Apparently the concentration of Nap in PAHs emission is higher than other compounds, but the major compositions in other components are Phe, Pyr and Bap. These result showed that whether low sulfur diesel or biodiesel were used, the increasing tendency of the concentration of carcinogen PAHs would increase with the engine speed.
With the increasing horsepower, oil consumption and emission temperature would cause the gradual generation of carcinogens. After biodiesel was used, 30 to 40% decrease of the total PAHs emissions, and 30 to 50% decrease of carcinogens PAHs than these when the low sulfur diesel was used, this also indicates that PAHs emission can be effectively reduced by using biodiesel.
Subjects
柴油引擎
超級柴油
生質柴油
PAHs
Diesel engine
low sulfur diesel
biodiesel
Type
thesis
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