Ce基FBC催化柴油机碳烟氧化特性的试验

Experiment on characteristics of soot oxidation from diesel engine with Ce-based FBC fuel

为了研究Ce基燃油添加剂(FBC)对柴油机碳烟催化氧化的效果,采用环烷酸铈溶液作为FBC,按照Ce元素质量分数分别为50,100,150,300 mg·kg^(-1)加至柴油中,依次标记为F50,F100,F150,F300.在发动机台架上进行了燃用FBC燃油的烟度、颗粒粒径分布和氧化特性以及微粒捕集器(DPF)催化再生的试验研究.结果表明:添加FBC可以改善柴油机燃油消耗率,降低排气温度和烟度排放;柴油机燃用FBC燃油时,其碳烟颗粒质量分布总体向着小粒径方向移动,排放颗粒物中积聚态颗粒物所占比重有所上升,而粗粒子模态所占比重下降;FBC对碳烟颗粒的催化效果非常显著,碳烟氧化特征温度随着FBC比例的增加而降低,柴油机燃用FBC燃油有利于降低DPF再生平衡温度.

To investigate the effects of Ce-based fuel borne catalyst （FBC） on the catalytic oxidation of soot from diesel particles, naphthenic acid cerium solution was selected as FBC. Ce element was blended with diesel fuel with the ratios of 50, 100, 150 and 300 mg·kg^-1（mass fraction） and marked as FS0, F100, F150 and F300, respectively. The experiments on smoke emission, particle size, soot oxidation characteristic and diesel particulate filter （DPF） catalytic regeneration were conducted on a light-duty diesel engine with FBC fuels. The experimental results show that FBC fuels can improve the fuel economy and reduce the exhaust temperature and smoke emissions. The particle mass distribution moves to the small particle size, and the proportion of accumulation mode particles is increased with decreased proportion of coarse mode particles for engine with FBC fuels. The soot oxidation temperature is decreased with the increasing of FBC ratio, and the DPF regeneration temperature can be reduced with FBC fuels.