請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5839
標題: 含水丁醇混合柴油和不同控制技術對重型柴油引擎排放PM2.5及其碳成分之影響
Effects of Water-Containing Butanol-Diesel Blends and Different Control Technologies on PM2.5 and Carbon Emissions from a Heavy-Duty Diesel Engine
作者: 席煒翔
Hsi, Wei-Hsiang
關鍵字: 含水丁醇混合柴油
Water-contaning butanol-diesel blend
重型柴油引擎
PM2.5
有機碳
元素碳
Heavy-duty diesel engine
PM2.5
Organic carbon
Elemental carbon
出版社: 環境工程學系所
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摘要: 本研究旨在探討重型柴油引擎使用含水丁醇混合柴油與不同控制技術對PM2.5與碳成分之減量效率,並針對引擎不同負載與轉速操作測試其PM2.5與碳成分之排放特性,其中不同控制技術包含調整不同噴油正時(-6°與-10°)、調整不同廢氣迴流比例(EGR 0 %、EGR 5 %、EGR 10 %)以及有無加裝選擇性觸媒還原(SCR)等測試項目,測試油品為B2市售柴油與油品中添加10 %和20 %含水丁醇之混合柴油,其分別以WBT10及WBT20表示。引擎測試皆利用動力計執行歐洲穩態測試循環,於柴油引擎尾氣端使用旋風分離採樣器採集PM2.5樣本,分析PM2.5中總碳(TC)、有機碳(OC)和元素碳(EC)之質量濃度,並估算其排放係數。 研究結果顯示,B2市售柴油中添加含水丁醇,可降低PM2.5質量濃度;相較B2市售柴油,使用WBT10與WBT20混合柴油之PM2.5排放減量效率分別約47 %與50 %,其中TC佔PM2.5百分比為80 % ~ 91 %,OC/EC比值介於0.7 ~ 0.8,尾氣微粒大多以EC形式排出。引擎負載愈高,空燃比愈低,排放PM2.5濃度愈高,且排氣溫度增加,OC/EC比值由2.0降至0.2;引擎轉速愈高,油耗量隨之增加,引擎排放的PM2.5濃度有增加的趨勢,OC/EC比值介於1.7 ~ 2.8之間。 柴油引擎不同控制技術中,調整不同噴油正時(-6°延後至-10°)與加裝SCR,PM2.5排放減量分別約13 %與23 %,而調整不同廢氣迴流比例(EGR 0 %增至EGR 10 %)則增量約97 %,其排放PM2.5之總碳皆約佔80 %以上;另一方面,OC/EC比值介於0.2 ~ 1.2,當引擎內部燃燒較完全或引擎負載較高時,排放廢氣溫度高則OC/EC比值有明顯下降的現象。
The purpose of this study is to investigate the reduction efficiency of PM2.5 and carbonaceous contents emitted from a heavy-duty diesel engine (HDDE) by using water-containing butanol-diesel blends and different control technologies. The experiments were conducted to characterize the emitted PM2.5 and carbonaceous contents with engine operated under various loads and speeds. The tested items included adjusting the different injection timing(-6� and -10�), adjusting the different exhaust gas recirculation (EGR) rates (0 %, 5 % and 10 %) and with or without selectective catalyst reduction (SCR). The tested fuels were B2 diesel and adding 10 % and 20 % water-contaning butanol-diesel blends (WBT10 and WBT20). The experiments were conducted on dynamometer under Europe steady testing cycle. PM2.5 were collected by using a cyclone sampler, and the samples were further analyzed for total carbon (TC), elemental carbon (EC) and organic carbon (OC). The mass concentrations and emission factors were finally estimated in this study. The results indicate the mass concentrations of the PM2.5 are lower with adding water-containing butanol. Compared to B2 diesel, the PM2.5 reduction efficiencies for WBT10 and WBT20 blends are 47 % and 50 %, respectively. The percentage of TC in PM2.5 varies between 80 % to 91 %. OC/EC ratios are in the range between 0.7 to 0.8, which shows EC is the major content of PM2.5. The concentrations of PM2.5 are higher with lower air-fuel-ratio and the ratio of OC/EC changes from 2.0 to 0.2 because of the higher temperature of emissions and higher engine load. When engine speed and fuel consumption increase, the concentrations of PM2.5 tend to increase while OC/EC varies between 1.7 to 2.8. The PM2.5 reductions by adjusting injection timing (-6� delayed to -10�) and adding SCR are 13 % and 23 %, respectively. But the PM2.5 increment for adjusting different exhaust gas recirculation rates (EGR 0 % increased to EGR 10 %) is 97 %. The percentage of TC in PM2.5 are higher than 80 %. On the other hand, OC/EC ratios are in the range between 0.2 to 1.2. When more complete combustion inside the engine or higher engine load, the OC/EC ratio decreased because of the higher temperature of emissions.
URI: http://hdl.handle.net/11455/5839
其他識別: U0005-0708201312515500
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0708201312515500
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