【摘要】 由于甲醇的引入,柴油掺烧甲醇发动机的PM排放减少、HC和CO的排放增加,并产生了甲醇和甲醛等非常规排放物。我们拟通过发动机台架试验,探究适合该类发动机的排放后处理技术方案。试验结果表明,柴油氧化催化器可以大幅度降低HC、CO和甲醇,对NO_x和甲醛的处理效果较差;氧化催化器和颗粒氧化催化器的结合可以实现超低碳烟排放,并完全消除CO和HC,同样处理NO_x和甲醛的效果较差;使用甲醇、甲醛等HC类物质作为还原剂的钒基选择性催化还原系统结合氧化催化器可完全消除HC和甲醇,并将甲醛保持在较低的范围内,但无法处理NO_x,需要寻找合适的催化剂。更多还原

【Abstract】 The diesel engine fueled by methanol-diesel fuel generates fewer PM. However, the introduction of methanol causes more HC and CO emissions, as well as some unconventional emissions like methanol and formaldehyde are produced. Through engine bench testing, an emission control strategy which is suitable for this kind of engine will be researched. The result indicates that the diesel oxidation catalyst can significantly reduce HC, CO and methanol, though the effect of dealing with NO_x and formaldehyde is relatively poor. In addition, the combination of oxidation catalyst and particle oxidation catalyst can achieve ultra-low carbon emission as well as zero emission for CO and HC, whereas it is less effective on NO_x and formaldehyde. Another trial is for the vanadium-based selective catalytic reduction system, using HC species like methanol and formaldehyde as a reducing agent, which is also combined with oxidation catalyst. This device can completely eliminate HC and methanol, and keep formaldehyde in a relatively low level. However, it cannot handle NO_x. So an applicable catalyst is required for it.更多还原