为研究低温等离子体协同NH3-SCR去除柴油机NOx 的性能与相关影响因素,实验研究了单独NH3-SCR,单独低温等离子体以及低温等离子体协同NH3-SCR三种系统下NOx的去除效率,并考察了反应温度、NO2/NO比值、O2浓度、C3H6浓度、放电能量密度等因素对各系统去除NOx的影响.实验结果表明:在合适的O2浓度下,低温等离子体可以有效将NO部分氧化为NO2,但过多的能量密度输入会导致副产物的大量生成同时造成能量消耗过多;提高NO2的量对于低温工况下大幅度提高SCR还原NOx 效率有重要意义,当NO2/NO=1时,NH3-SCR在各温度下NO二转化效率达到最高,继续增大NO2的比例,NOx的转化效率又趋于下降.利用低温等离子体辅助NH3-SCR的协同作用可以大幅度提高低温工况下NH3-SCR的NOx转化效率.
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