在模拟实验系统上,利用介质阻挡放电(DBD)结合 Ag/Al2 O3催化剂进行烟气脱硝实验,分析了C2 H4对脱除 NOx 的影响及脱除机理.结果表明：同样情况下,添加C2 H4后,NO脱除率明显升高,并且随着 C2 H4浓度的升高而增加；同时,加载催化剂比未加载催化剂的NO脱除率高.在能量输入密度300 J/L、C2 H4体积分数1％时,DBD协同Ag/Al2 O3催化,NO脱除率达61．3％.分析认为：在DBD发生器中, C2 H4与 O2反应生成CH3 O2�、HO2等强氧化性基团,将 NO 氧化成 NO2；在催化装置中,C2 H4与 O2在 Ag/Al2 O3表面发生反应,产生更多的 CH2＝CH-O�和CH3 COO�等自由基,最终使NOx 脱除率升高.%An experimental simulation system was built for removal of NOx from flue gas using combined method of dielectric barrier discharge (DBD)and Ag/Al2 O3 catalyst.The effect of eth-ylene addition on NOx reduction was investigated in detail.The results show that NO removal rate increased significantly with the addition of C2 H4;as the C2 H4 concentration increased,the effects were enhanced.Compared to the system without catalyst,NO removal rate increased by a certain degree with catalyst.When the energy density was 300 J/L and the volume fraction of ethylene was 1%,NO removal rate would reach 6 1 .3% by DBD-Ag/Al2 O3 .The mechanism analysis indi-cates that,strong oxidizing radicals produced in DBD generator,like CH3 O2��,HO2 ,etc.,and CH2=CH-O��,CH3 COO��,etc.produced in catalytic reactor through the reaction of C2 H4 with O2 ,played a key role in NOx removal.
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