O2+、O3同时脱硫脱硝实验

针对目前的烟气同时脱硫脱硝方法中存在的投资成本、运行费用、占地面积大等问题,研究强电离放电方法产生高浓度氧活性粒子(O2+、O3)注入烟气外排管道中,进行O2+、O3消除烟气中的NO, SO2转化成HNO3, H2SO4的等离子化学反应.描述强电离介质阻挡放电制取O2+、O3原理和烟道中O2+与H2O反应形成·OH及其氧化脱硫脱硝反应机制,分析回收酸液中的酸根离子种类及浓度.在O2+、O3与NO+SO2的物质的量比为5,烟气温度为65℃,H2O体积浓度为10%,停留时间为1s的实验条件下,脱硝脱硫率分别为97.4%,83.2%.

Simultaneous desulfurization and denitrification by O2+, O3

In order to solve the disadvantage of high investment and operating costs, and large occupied area in conventional technology of simultaneous flue gas desulfurization and denitrification, reactive oxygen species (O2+ and O3) produced by a strong ionization dielectric barrier discharge were injected into the emission duct. In the plasma reaction duct, O2+ and O3 oxidized NO to HNO3, and SO2 to H2SO4. The principle for O2+ and O3 produced was discussed. The mechanisms for ·OH radical generated from O2+ reacting with H2O, and simultaneous flue gas desulfurization and denitrification by ·OH radicals were introduced. The composition of the recovered acid liquid was analyzed. Removal rates of 97.4% for NO, and 83.2 % for SO2 were obtained under the following optimal experimental conditions: the molar ratio of reactive oxygen species (O2+, O3) to SO2 and NO was five; the inlet flue gas temperature was 65 °C; the H2O volume fraction was 10%, and the reaction time was 1s.