采用低温等离子体技术降低柴油机有害排放物的研究

An Experimental Investigation on the Removal of Emissions from Diesel Engine by Non-Thermal Technology

在分析电晕荷电特性的基础上,研制出了一套低温等离子体反应器,对柴油机微粒(PM)、NOx及HC的去除进行了试验研究,并进行了不同工况下微粒捕集效率的变化试验。通过对系统进行耐久性能试验,研制出了一套新颖的再生装置并进行了再生试验研究。结果表明,在发动机广泛的转速以及中低负荷下,其微粒捕集效率一般在60%～90%的范围,NOx的去除效率可达20%,HC的去除效率可达25%～30%。再生装置的使用有效地解决了电晕线的再生问题。

A nonthermal plasma reactor was designed and built based on the theory of pulsed corona discharge. Experiments were performed to measure the trapping efficiency of PM and the removal efficiency of NOx and HC on the 2135G diesel engine. Meantime, the influences on trapping efficiency of PM under a variety of engine operating conditions were tested and studied. Based on the endurance performance of this after-treatment system, a novel regeneration system was designed and tested. The experiment results show that, under the most partial load and speed conditions, the tapping efficiency of PM can reach 60%～90% and the removal efficiency of NOx T20% and HC 25%～30% respectively. The regeneration system provides an effective and practical way to remove the PM loaded on the electrode. 