| Summary: | 碩士 === 國立中興大學 === 機械工程學系 === 93 === This research is focused on homemade catalyst particulate filters applied in diesel engines and buses. First of all, we investigated the influence of engine operation to the function of catalyst particulate filters, estimated the reduction of exhaust of diesel engines loaded with catalyst particulate filter by many engine testing procedures with different rates of sulfur diesel fuel, and analyzed the reducing effect of Polycyclic Aromatic Hydrocarbons (PAHs) in granular exhaust that might introduce mutant in human body in the laboratory.
The result shows that the loading and output rate of engine after being packed with catalyst particulate filter changed slightly but the influence is within the range of 3%. It has an apparent effect in inhibiting the exhaust of THC and CO after the catalyst particulate filter is packed, especially in the condition of engine working in high loading capacity. The converting efficiency of catalyst particulate filter changes with temperature; its clear function is more effective when the exhaust temperature is controlled over 350℃. For its influence to the granular exhaust of engine, it has a reducing effect of PM exhaust, no matter diesel fuel of high or low sulfur rate is used, but PM reducing effect is better when standard diesel fuel of higher sulfur rate is used. In addition, catalyst particulate filter can not only reduce the exhaust of granular pollutant, but also can lower the density of PAHs exhaust. Both PM and PAHs exhaust are declined when reducing the sulfur rate in diesel fuel.
For the real car testing, the function of catalyst particulate filter after 10,000 kilometers is only 50% compared with not packed one. The experiment proved that the exhaust temperature of engine is not the only main factor that influences the elimination of carbon grains insides the particulate filter, the time of regeneration temperature also has its effect. The accumulation of carbon grains increases caused by the insufficient burning time. The toxicants cover the surface of catalyst thus the particulate filter gradually loses its original function.
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