| 英文摘要 |
The project began on 3rd Feb., 2016 and ended on 2nd Feb., 2018. The work items in this project included to screen old garbage trucks in Nantou County which were suitable for installing Diesel Particulate filter(DPF), then installing DPF on these old garbage trucks and let these trucks executed their duty as usual. The purpose of this project was to evaluate the removal efficiency of the device to remove diesel particulate matter or soot from the exhaust gas of different diesel engines. And see if the system would benefit the trucks by reducing air pollutants emission as well as running well on the road. An annual emission reduction of 192.1 kg and 162 kg for PM10 and PM2.5 each were estimated for the two-year plan.
The Diesel Particulate filter is made of cordierite (a ceramic material that is also used as catalytic converter supports (cores)). Filters require maintenance which means to go through a regeneration process which removes this soot and lowers the filter pressure. The devices designed a active regeneration system and burn out the soot and ashes, then let the trucks drive on the road as usual. This on-board active systems use gas fuel as an extra fuel and initiates when the rest time reaches 4 hours and driving time accumulates 2 hours. The default value of regeneration time is 120 or 240 seconds depending on the duty types.
30 trucks joined this pilot project. They were chosen based on the production year, horsepower and truck space. They were installed DPFs and performed periodical tests when the truck ran 2500 km or every three months during the project period. The periodical tests were performed to check the loss of horsepower and removal efficiency of DPFs. Three trucks encountered huge horsepower losses during this period. We picked one of them to do a series check of its engine function, but the horsepower was back to normal and the removal efficiency of PDFs was fine. The test results show that the installation of DPF isn’t the main reason of huge horsepower losses of the chosen trucks.
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