基于EGR降低柴油機排放的研究

基于EGR降低柴油機排放的研究
預覽:

基于EGR降低柴油機排放的研究

摘要:

日益嚴峻的能源和環境問題是汽車工業發展所面臨的嚴重挑戰,實現高效、清潔燃燒是車用汽油機的發展方向,嚴格的排放法規對內燃機技術不斷提出新的挑戰,如何在保持高熱效率的同時降低有害排放是目前柴油機面臨的主要問題。柴油機的有害排放物中,控制NOx排放非常重要,現有技術條件下,既可以大量降低NOx排放,又能節省部分負荷燃油消耗的較成熟技術是廢氣再循環(EGR)。本文進行了EGR對性能和排放影響的研究,結果表明,通過調節VNT開度可以有效控制EGR率,并能保證較充足的新鮮空氣量,提高噴射壓力可以明顯改善NOx和煙度的trade-off關系。

關鍵詞:柴油機廢氣再循環燃燒排放

英文摘要:

It is a great challenge for the automotive industry development to meet the requirement for more and more stringent environment pollution regulations and severe shortage of petroleum 0il.The increasingly stringent emission legislations have put more serious technical challenges on I. C. engines. One of the major issues diesel engine facing is how to reduce pollutant emissions while still maintaining high thermal efficiency. As NOx emission from SI engine is one of main components to form optical-chemical smoke, it is very important to restrict NOx emissions. In the existing methods, EGR is relatively effective technology not only to reduce the emission of NOx but also to save fueI consumption at part Ioad. A high pressure cooled EGR system based on VNT was designed, and the effects of EGR on the performance and emissions of the engine were studied. Results show that the EGR rate can be effectively regulated by adjusting VNT vane position while still ensuring sufficient fresh intake air mass flow. The trade-off between NOx and smoke was improved by increasing the injection pressure.

keywords:Diesel engine, Exhaust gas recirculation(EGR), Combustion, Emissions

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