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柴油机颗粒捕集器(diesel particulate filter,DPF)是降低柴油机颗粒物排放的有效手段。喷油助燃是重型柴油机采用最多的一种DPF主动再生方法,由于DPF主动再生试验实施非常困难,很少直接对真实柴油机DPF的主动再生过程进行试验研究。文中对柴油机稳态工况下催化型柴油机颗粒捕集器(catalyzed diesel particulate filter,CDPF)喷油助燃主动再生过程进行试验研究,对CDPF主动再生过程中的压降、温度以及排放进行了分析。研究表明:CDPF主动再生时,其内部局部地区的温度远远高于CDPF的进口温度和出口温度,CDPF内部温度分布总体呈现出轴向上越靠近CDPF后端温度越高,径向上中间温度最高,中心温度次之,边缘温度最低的规律。CDPF主动再生时会有少量的碳氢和CO泄漏,CDPF后的NO_2浓度会显著降低,颗粒物数量排放会显著增加。
Diesel particulate filter (DPF) is an effective way to reduce the emission of diesel particulate matter. Fuel injection combustion is one of the most used DPF active regeneration methods for heavy-duty diesel engines. Since DPF active regeneration test is very difficult to implement, it is seldom to directly study the active regeneration process of real diesel DPF. In this paper, the active regeneration process of fuel catalytic combustion diesel particulate filter (CDPF) under steady-state condition is studied. The pressure drop, temperature and emission of CDPF during active regeneration are analyzed. The results show that when the CDPF is actively regenerated, the internal temperature of CDPF is far higher than the inlet temperature and outlet temperature of CDPF. The internal temperature distribution of CDPF generally shows that the higher the temperature is, the higher the radial temperature is, Center temperature followed by the edge of the law of the lowest temperature. When CDPF is actively regenerated, there will be a small amount of hydrocarbon and CO leakage. The concentration of NO 2 after CDPF will be significantly reduced, and the emission of particulate matter will be significantly increased.