柴油机颗粒后处理技术对颗粒物排放的影响

Effects of after Treatment Technologies on Diesel Engine Particulate Emissions

本文利用一台满足国Ⅲ排放标准的电控共轨柴油发动机，研究了氧化型催化转化器（DOC）、燃油催化剂型的壁流式颗粒捕集器（FBC-DPF）和带有DOC的壁流式颗粒捕集器（DOC＋DPF）三种不同的柴油机颗粒物净化装置对柴油机颗粒物排放的影响，定量研究了不同转速和负荷下，这三种后处理装置前后颗粒物数量和质量的变化。研究显示：DOC对颗粒物的净化效率大约在20％～30％之间，FBC-DPF对颗粒物的净化效率大约在90％．98％之间，DOC＋DPF对颗粒物的净化效率也超过了90％。结果表明壁流式的颗粒捕集器对柴油机颗粒物有较高的净化效果。

The reduction efficiencies of particulates of three after treatment devices ： a diesel oxidation catalyst （ DOC）, a fuel borne additive wall-flow particulate filter （FBC-DPF） and a wall flow particulate filter with DOC was studies on an electronic control common rail diesel engine. The particulate matter and numbers before and after the devices was measured under the different speeds and loads.