控制稀燃汽油机NO_x排放实验

Experiment on Reduction of NO_x Emission in a Lean-Burn Gasoline Engine

对一台 1. 342L稀燃汽油机的NOx排放进行研究.机内净化和排气后处理并行,一方面采用稀燃、快燃(滚流)和推迟点火的可控燃烧新方案来降低NOx的机内排放;另一方面采用原位合成的分子筛稀燃催化器Cu ZSM5对NOx排放进行后处理.在稀燃发动机典型工况下,燃油经济性较原机改善 14. 800时,NOx的排放最低可以达到 133×10-6.排气温度处于 220~450℃之间时,NOx的排放均处于 250×10-6以下.

The NO_x emission of a 1.342 L lean-burn gasoline engine was studied.Both purification in cylinder and treatment after exhaust were adopted. On the one hand the new combustion method used lean-burn, fast burn(tumble)and delayed ignition to reduce the NO_x emission. On the other hand it used Cu-ZSM5 zeolite catalyst which was in-situ synthesis to give the exhaust NO_x an after-treatment.All these methods made the lowest NO_x emission attain 133×10^(-6) at the typical experimental condition of lean-burn engine, and the NO_x emission was below 250×10^(-6) when the exhaust temperature was at 220—450 ℃.The fuel consumption decreased by (14.8~0_0) at the same time.