负极性高压脉冲电晕脱除NO的研究

利用负脉冲流光电晕放电在室温条件下对空气＋ＮＯ简单混合气体进行了脱硝实验研究．实验所用脉冲电压的前沿上升时间为３００ｎｓ，脉冲半高宽大约５００ｎｓ．结果表明：脉冲流光电晕放电对脱除ＮＯ是有效的；在脉冲电压上叠加直流偏压能提高ＮＯ的脱除率；混合气体中含一定量的水分对脱除ＮＯ有促进作用；在气体流速、ＮＯ脱除率和注入反应器中的电功率一定时，ＮＯ的脱除总量随初始浓度的增大而增加；氨气（ＮＨ３）添加剂使ＮＯ的脱除率大幅度上升，并生成固态硝酸铵（ＮＨ４ＮＯ３）．文中还对放电等离子体中气相化学反应脱除ＮＯ的机理进行了探讨．

The removal of NO by means of negative pulse streamer corona

The experimental study on the removal of NO from Air NO gas mixture Was con ducted using an intense corona discharges induced by very fast rising,narrow pulse high voltages at room temperature.The pulse voltage used in ail cases was regative polarity with a rise time of 300ns,a width of 500us and a frequency of 50Hz.The results shown that this new technique was effective to reduce NO,in particular,for the pulse voltages pulus dc bias.The effect of H2O on the removal rate of NO was of importance. The amount of NO consumption increased with increasing the initial concentration of NO in the mixture.An addition of NH3 considerably enhanced the reduction of NO in the moist mixture,and subsequently white powders(NH4NO3)was found in the reaction vessel. The mechanism of the removal of NO via gas phase reactions by pulse streamer corona discharges was analysed in the poper.