| Summary: | 碩士 === 國立成功大學 === 環境工程研究所 === 83 === The concentrations and characteristics of sixteen polycyclic
aromatic hydrocarbons(PAHs)in the exhaust were measured at the
tail pipe of a gasoline engine. the three controlled operation
parameters were engine speed(1000 to 3000 rpm),loading(0 to 3.8
apm),and throtle opening(0 to 100%). Premium and 95-Lead free
gasolines were used in this study. Results show that all three
parameters have distinct effects on the emission of PAHs. At
higher engine speeds PAHs with higher molecular weights, which
are more carcinogenic,tend to dominate in the exhaust. At the
same engine speed,PAHs increase with loading and throttle
opening. When both loading and throttle opening are kept the
same,totol PAHs remain pratically constant,however,the
distributions in gas and particle phase change with engine
speed. The emission coefficient is found to range from 227 to
1562 ug/Nm3. The peak value was found at 1500 rpm.
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