钠添加剂对介质阻挡-电晕放电耦合法尿素脱除NO的影响

摘要

利用自主设计的介质阻挡-电晕放电耦合装置进行脱除NO的实验研究,在N2/O2/NO体系中,考察加入不同钠添加剂(Na2CO3、NaOH、CH3COONa)对尿素脱除NO的影响,同时探讨其在脱除NO过程中的作用机理.结果表明:在研究范围内,仅添加尿素时,NO脱除率随尿素含量的增加而增大,当输入电流为0.83A,尿素分解产生氨气的体积分数为0.3%时,NO脱除率为64.23%,此时体系中有CO生成且随尿素含量的增加而增加;少量钠添加剂的加入可显著提高NO脱除率,且脱除率随钠添加剂含量的增加而增大,此时CO生成量得到有效抑制.在加入量相同的条件下,各种钠添加剂对尿素脱除 NO 均有促进作用,促进作用大小依次为:NaOH>Na2CO3>CH3COONa,当加入氢氧化钠与尿素质量比为10:10时,输入电流仅为0.83A时,脱除率可达90.71%;电流为5A,脱除率达95.71%,此时体系中几乎无CO生成.%The effects of different sodium additives(Na2CO3、NaOH、CH3COONa)on the removal of the NO by urea and the mechanism of the NO removal were investigated on a self-designed dielectric barrier-corona discharge coupling device. The results indicated that,within the scope of the study,the NO removal rate increased with the increase of the urea content. The NO removal rate was 64.23% with 0.3% urea added at 0.83A current. However,the CO was produced and increased with the increasing of the dosage of urea;the addition of a small amount of sodium additives could significantly improve the NO removal rate that increased with the increase of the content of sodium additives. The amount of CO production was effectively inhibited. Under the same dosages,various sodium additives could promote the NO removal of urea. The NO removal was affected by the sodium additive in accordance with the order of NaOH>Na2CO3>CH3COONa. NO removal rate was 90.71% and 95.71% at 0.83A and 5A current,respectively;when sodium hydroxide and urea mass ratio was 10:10.while there was almost no CO.