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为了研究介质材料对介质阻挡放电脱除NO的影响,采用不同介电常数的材料作为介质层进行了模拟和试验研究,并用玻尔兹曼方程计算了折合场强与分子离解速率和电子平均动能的关系.结果表明:随着介质介电常数的增大,反应器内电场强度增大,导致折合场强升高,增大了电子的平均动能,提高了气体分子的离解速率,可产生更多活性粒子;在刚玉、石英和陶瓷3种材料中,刚玉的介电常数最大,刚玉介质层的等效电容运输电荷的能力最强,放电电流增大,有利于NO的脱除.
In order to study the effect of dielectric materials on the NO removal by dielectric barrier discharge, a series of simulation and experimental studies have been carried out on materials with different dielectric constants. The equivalent field strength, molecular dissociation rate and electron average kinetic energy have been calculated using the Boltzmann equation The results show that with the increase of the dielectric permittivity, the electric field strength in the reactor increases, which leads to the increase of the field strength, the increase of the average kinetic energy of the electrons and the increase of the dissociation rate of the gas molecules, resulting in more In the corundum, quartz and ceramic materials, the dielectric constant of corundum is the largest. The equivalent capacitance of corundum dielectric layer is the strongest to transport the charge and the discharge current is increased, which is propitious to the removal of NO.