低能耗非热等离子体NO还原特性

分别建立了新型低能耗N2-NO系统的单电极尖端放电和介质阻挡放电非热等离子体NO还原实验系统，通过实验研究了电极极问电压V和尖端距离lg以及Al2O3，CaO，MgO，玻璃等不同介质阻挡对活性N原子产生及NO还原率的影响规律。结果表明，NO还原率随尖端距离lg的增大而先增后减，随极间电压Vm和气体停留时间t的增大而增大，尖端距离lg是决定电极之间的电场强度Eg和气流停留时间t的关键几何变量。利用活性N原子的产生条件解释了放电外轮廓直径及电场强度随尖端距离lg变化的消长规律。不同阻挡介质所形成的气体放电的电场强度不同，提供给活性粒子的能量也不同，从而对NO还原效果具有不同的影响。单电极尖端放电NO还原特性的研究结果对介质阻挡放电NO还原有指导作用。

NO Reduction Characteristics with Low Energy-Consumption Using Non-Thermal Plasma

Using an experimental NO reduction s ystem with single-electrode tip discharge structure and dielectric barrier disc harge structure respectively, NO reduction characteristics of the N 2-NO syste m and the effects of dielectric characteristics on NO reduction are revealed to guide the engineering practice. Experimental results show that the amount of act ive N atom and NO reduction rate increase at the beginning of the increasing dis tance between two tips and then drop when the distance exceeds to a certain va- lue. The NO reduction rate increases while the voltage between two electrodes or the resident time of gas flow increases. The distance is a key geometrical vari able which can determine the electric field intensity between two electrodes and gas flow resident time. Experimental results of NO reduction rate with differen t dielectrics, such as Al 2O 3, CaO, MgO and glass show that the electric fiel d intensity is different with different dielectrics, because it brings different energies to the active particles in discharge room, thus causing different NO r emoval rates.