微纳米气液分散体系吸收NO

以模拟烟气为气源,去离子水为水源,通过微纳米气泡发生器形成微纳米气液分散体系,吸收模拟烟气中的NO,考察了多种因素对脱硝率(η)和气相体积总传质系数(KGa)的影响,分析了微纳米气液分散体系吸收NO的反应机理。结果表明:η和KGa随着进气NO体积分数和十二烷基苯磺酸钠(SDBS)质量浓度的提高而下降;随着吸收液初始pH的提高先降低后升高;随着进气O2体积分数的增大而提高;随着吸收液温度的升高先提高后降低;控制进气NO体积分数为0.06%时,在吸收液初始pH为2.0、吸收剂为去离子水、吸收液温度为25℃、进气O2体积分数为10%的最佳条件下,脱硝率可达81.0%。微纳米气液分散体系是通过产生羟基自由基从而对NO进行氧化吸收的。

Absorption of NO into micro-nano gas-liquid dispersion system

Using the simulated flue gas as gas source,the deionized water as water source,the micro-nano gas-liquid dispersion system was formed by the micro-nano bubble generator to absorb NO in the simulated flue gas. The factors affecting the NO removal rate （η） and the gas phase volumetric total mass transfer coefficient （K_Ga） were investigated,and the reaction mechanism of NO absorption into the micro-nano gas-liquid dispersion system was studied. The results indicated that：η and K_Ga was decreased with the increase of NO volume fraction and sodium dodecyl sulfate （SDBS） mass concentration,decreased firstly and then increase with the increase of initial absorbent pH,increased with the increase of O₂ volume fraction,and increased firstly and then decreased with the increase of absorption temperature;When the volume fraction of intake NO was controlled at 0.06%,under the optimal conditions of initial pH of absorption liquid 2.0,using deionized water as absorbent,absorption temperature 25 ℃ and O₂ volume fraction of the intake 10%,the NO removal rate could reach 81.0%. The micro-nano gas-liquid dispersion system could oxidize and absorb NO by generating hydroxyl radicals （·OH）.