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分析了非平衡等离子和介质阻挡放电的产生机理.根据非平衡等离子产生活性基体的特点,建立了非平衡等离子辅助催化对柴油机有害排放的转化模型.采用蜂窝式介质阻挡放电反应器辅助催化装置,在台架试验上研究了不同试验方案对降低有害排放的影响.试验结果表明在不添加催化剂的情况下,NOx的总量基本不变,表明非平衡等离子气相区内主要是将NO氧化为NO2;添加催化剂后,NOx的总量明显下降,表明NO2被还原为N2.同时PM颗粒与强氧化性的活性基体反应生成CO2得以大幅度降低,证明了利用非平衡等离子辅助催化技术可以有效降低柴油机NOx和PM颗粒排放.
The formation mechanism of non-equilibrium plasma and dielectric barrier discharge was analyzed.Based on the characteristics of non-equilibrium plasma-generated active matrix, a model of non-equilibrium plasma-assisted catalytic reduction of harmful emissions to diesel engine was established.Using a CID catalytic reactor, The effects of different experimental schemes on reducing harmful emissions were studied on a bench test.The experimental results show that the total amount of NOx is basically unchanged without addition of catalyst, indicating that NO is mainly oxidized to NO2 in the non-equilibrium plasma gas phase region ; After adding the catalyst, the total amount of NOx decreased significantly, indicating that NO2 was reduced to N2. At the same time, the reaction between PM particles and strongly oxidizing active matrix to produce CO2 could be greatly reduced. It was proved that using unbalanced plasma assisted catalysis can effectively reduce the diesel engine NOx and PM particulate emissions.