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介质阻挡放电(DBD)协同催化剂可有效脱除NOx,在一段式DBD反应器中固体催化剂颗粒兼具有放电阻挡介质作用,可有效提高放电功率。今通过建立数学模型以及实验测试研究了在DBD反应器中填充颗粒直径对放电功率的影响规律,研究发现随填料颗粒直径增大,放电功率先增加再降低,并且随输入电压增大颗粒直径对放电功率影响更加显著。因为当填料粒径大于峰值时,在DBD反应器中随粒径增大间隙增加大,在相同条件下间隙电容小于固体颗粒电容,总电容量降低,所以放电功率随颗粒直径增大而降低。当填料粒径小于峰值时,随颗粒直径减小固体颗粒等效电容厚度变小,易被击穿,电容量降低,所以放电功率随颗粒直径减小而降低。随输入电压增大放电增强,有效面积增大,而最大有效放电面积跟填充颗粒直径有关,所以粒径对放电功率影响随输入电压增大而增强。填料颗粒直径对反应器总输入功率影响很小,因为总输入能量不仅消耗于系统放电,而且还使系统产生热量。理论模型和实验测试结果变化趋势基本一致,该结论可为DBD协同催化反应过程中选择适宜催化剂颗粒直径提供理论依据。
Dielectric barrier discharge (DBD) synergistic catalyst can effectively remove NOx. In one-stage DBD reactor, the solid catalyst particles also act as a discharge barrier medium, which can effectively improve the discharge power. Nowadays, the influence of particle diameter on discharge power in DBD reactor has been studied by establishing mathematical models and experimental tests. It is found that the discharge power increases first and then decreases with the increase of filler particle diameter, and increases with the increase of input voltage The impact of discharge power is more significant. Because when the filler particle size is greater than the peak, the DBD reactor with increasing particle size increases the gap, under the same conditions, the gap capacitance is less than the solid particle capacitance, the total capacitance decreases, so the discharge power decreases with increasing particle diameter. When the filler particle size is smaller than the peak value, as the diameter of the particles decreases, the equivalent capacitance of the solid particles becomes smaller and the breakdown voltage decreases. As a result, the discharge power decreases as the particle diameter decreases. As the input voltage increases, the discharge increases and the effective area increases, while the maximum effective discharge area is related to the diameter of the filled particles. Therefore, the influence of the particle size on the discharge power increases with the input voltage. The filler particle diameter has a small effect on the total reactor input power because the total input energy is not only dissipated in the system, but also causes the system to generate heat. The theoretical model and the experimental results of the trend of change are basically the same, which can provide a theoretical basis for the selection of suitable catalyst particle diameter during the synergistic catalysis reaction of DBD.