柴油机微粒陶瓷过滤器红外再生和NO_x催化还原的试验研究

Experimental Study of Infrared Regeneration of Diesel Ceramic Filter and Catalytic Reduction of NO_x

通过试验的方法对陶瓷过滤器降低微粒排放和催化还原降低NOx排放进行了深入的研究。影响微粒过滤器再生的主要因素有加热器的结构、加热器的功率、再生用的废气量。加热器的功率影响再生的时间；废气量影响再生温度，从再生需要的氧气量和气体带走的热量两方面来考虑。试验结果表明，经过合理的再生优化，再生温度能控制在900℃左右，再生效率能达到80％以上。NOx的催化还原，分别应用Pt／Rh／Pd和Cu．ZSM-5催化剂在不外加还原剂的情况下对柴油机废气中NOx进行还原，转化效率达到20～30％。

An experimental study on diesel ceramic filter and catalytic reduction are conducted to investigate the effects on reducing particulate and NOx emissions. The main factors affecting filter＇s regeneration include the heater＇s configuration and power, and the mass flow of exhaust gases. The heater＇s power affects the regenerating duration, and the mass flow of exhaust gases affects the temperature of regeneration, which is determined by the required oxygen and the relaxed heat flow. The results indicate that the regeneration efficiency is above 80% at the temperature of 900℃, and the NOx＇s reduction efficiency is about 20 -30% using catalyst Pt/Rh/Pd and catalyst Cu-ZSM-5 without other reducer.