低温等离子体降低生物柴油发动机有害排放的研究

Experimental Study on Biodiesel Engine Emissions Using Non-thermal Plasma

根据介质阻挡放电理论,设计出低温等离子体发生器。利用气相色谱/质谱联用仪对生物柴油样品进行了测定,确定了生物柴油的主要成分。通过台架试验研究了低温等离子体对生物柴油和0号柴油发动机有害排放的作用规律,运用扫描电镜和X射线能谱仪对柴油机排气中收集的颗粒物样品进行检测和分析。研究结果表明:低温等离子体技术可以有效降低柴油机颗粒物排放,NOx排放总量变化较小;生物柴油属于富氧燃料,可使发动机燃烧室碳燃料充分燃烧,颗粒物样品中碳烟成分较少,颗粒粒径也较小。元素分析结果表明,低温等离子体技术受燃料中硫的影响较小,是一项有前途的柴油机排气后处理技术。

Based on the dielectric barrier discharge theory, the non--thermal plasma reactor was designed. The main components of the biodiesel sample were detected using gas chroma--tographymass spectrometry. The bench test experiment was carried out, and the reduction of diesel engine harmful emissions with NTP operating on both biodiesel and No 0 diesel had been investigated. Scanning electronic microscope and X- ray energy spectrometer were used to detect the surface structure and chemical component of particular samples from the exhausts of diesel engine. Results show that the particular matter is decreased remarkably but NOx emissions change a little by NTP, the biodiesel can improve the performance of combustion and the particular matter from the oxygenated fuel has less component and small diameter. The results of elemental analysis reveale that NTP is unaffected by exhausts impurity such as sulfur, and is one promising technology for diesel engine emissions reduction.