Promotion of premixed charge compression ignition combustion fueled by natural gas based on selective and heterogeneous recirculation of nitrogen oxides

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(1) The behavior of autoignition and combustion were investigated through indicator diagram and combustion visualization on a rapid compression and expansion machine when nitrogen oxides were inducted into a premixture heterogeneously. The obtained results show that higher sensitizing effect is obtained from nitrogen oxides unevenly distributed compared to that homogeneously distributed because the existence of local spots with high NOx concentrations can assist autoignition effectively.(2) We proposed the selective recirculation of NOx in burnt gas by using NOx absorption catalyst. The feasibility of proposed technique in which absorbed NO was regenerated using a fuel as a reductant was investigated on a small reactor with NOx absorption catalyst for commercial vehicles. The effect of reaction temperature and chemical spices of reductant were investigated in regeneration process. As a result, 25% of NO absorbed on a catalyst was able to be regenerated.