| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 100 === The purpose of this study is to investigate the reduction efficiency of PM2.5 and carbonaceous content emitted from a heavy-duty diesel engine (HDDE) by using biodiesel fuel and diesel oxidation catalyst (DOC) equipped with diesel particulate filter (DPF). The experiment was under various engine torque and speed. The test include various cell density DPF, DPF with or without DOC, and DPF regeneration process, the characteristics of PM2.5 emission are study. The tested fuels were diesel fuel adding 2 %, 10 %, 20 %, waste cooking oil(B2, B10 and B20), experiment were simulate Europe steady testing cycle on dynamometer, PM2.5 were collected by using a cyclone sampler, and the sample were further analyzed the content of total carbon (TC), element carbon (EC), and organic carbon (OC), the emission factor were also estimated in this study.
The results indicate that using higher percentage of waste cooking oil caused lower PM2.5 emissions, the emitted PM2.5 concentration with B2, B10, B20 by diesel fuel are 52, 49, 47 mg/m3 respectively, the percentage of TC in those emitted PM2.5 varied between 78 % to 89 %. OC/EC ratio are in the range between 2.2 to 5.2, results indicated that OC was the major content of PM2.5 by using biodiesel. The emitted PM2.5 mass concentration increasingly 3 times when engine operation condition change from idle (0 %, 750 rpm) to full load (100 %, 1650 rpm), but the ratio OC/EC decrease to 0.5 when engine operation changed from low speed (25 %, 1650 rpm) to high speed (25 %, 1950 rpm), the PM emission reduce 31 %, and OC/EC ratios varied between 1.3 to 2.8.
In conclusion, this study indicates various exhaust aftertreatment equipments are very effective in removing the PM2.5 and carbonaceous mass concentrations in exhaust with reduction efficiencies of above 85 % and 90 %, respectively. The reduction efficiency by re-release of DOC internal particles and different number of cell density DPF. During the DPF regeneration, the DPF internal particles showing a large number of emission phenomena. The results of this study help to understand the waste cooking oil biodiesel and aftertreatment equipment used with a HDDE, effect the characteristics of PM2.5 and the reduction efficiency. This study also provide the information to establish the emission inventory of PM2.5, TC, OC and EC emitted from diesel engine.
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