介质阻挡放电脱硝的研究

介质阻挡放电(DBD)作为低温等离子体技术常被用于烟气中污染物的脱除。研究了利用DBD技术脱除烟气中一氧化氮(NO)的效果,以及氧气(O₂)、乙烯(C₂H₄)和放电区间活性炭添加对NO脱除率的影响。结果表明:当O₂浓度小于3%时,O₂的增加对NO的脱除有促进作用;大于3%时,O₂的增加会产生过量的氧自由基(·O),对NO的脱除产生抑制作用。添加活性炭和C₂H₄均能明显提升NO的脱除效果。在三者结合作用下,NO的脱除率可达到90%,特别是C₂H₄的增加对NO的脱除有促进作用。

Study on denitration by dielectric barrier discharge technology

Dielectric barrier discharge (DBD) technology is a kind of low-temperature plasma technology which is often used in the removal of pollutants in flue gas. The effect of nitric oxide removal by DBD was studied, and the influences of oxygen content, ethylene content and the addition of activated carbon in the discharge interval on the removal efficiency of nitric oxide were analyzed. The results show that when the oxygen content is less than 3%, the increase of oxygen promotes the removal of nitric oxide, while under the oxygen content of more than 3%, the increase of oxygen will produce excessive oxygen free radical (·O), which inhibits the removal of nitric oxide. The removal efficiency of nitric oxide can be improved by adding activated carbon and ethylene. Through the combination of DBD, activated carbon and ethylene, the removal efficiency of nitric oxide can go up to 90%, and especially the addition of ethylene can promote the removal of nitric oxide.