超重力环境下芬顿溶液氧化吸收NO的研究

Oxidation and Absorption of NO into Fenton Reagent under Super-gravity Environment

NO的排放严重影响大气环境,其溶解度低不易被液相吸收。芬顿法产生的羟基自由基氧化性极强但寿命很短,超重力机具有混合速率快、液体停留时间短的特点,该文创新性地结合二者优势,对NO气体进行液相氧化吸收。分别研究了芬顿溶液pH值、浓度、H_2O_2与Fe^(2+)浓度比值、超重力机转速以及NO与芬顿溶液体积流量比等条件对NO脱除效果的影响。超重力机双进液口处即时混合H_2O_2与Fe^(2+)溶液,在1 400 r/min转速下使用pH=2,H_2O_2浓度0.2 mol/L,H_2O_2与Fe^(2+)浓度比为4的芬顿溶液对NO的脱除效果最优。当H_2O_2与Fe^(2+)液流量均为15 L/h,500×10-6 NO气流量为200 L/h时,NO的脱除效率可以达到75%。

NO, due to its low solubility, is not easily absorbed by liquid. To remove NO, oxidation and absorption of NO by Fenton method was used together with a rotating packed bed, the super-gravity machine, during which hydroxyl radicals pro-duced by Fenton reaction had super high oxidative properties with very short lifetime, while the rotating packed bed gave rise to quick mixing rate and short liquid residence time. In this paper, parameters affecting NO removal were studied including pH, concentration of Fenton solution, and ratio of H2O2 to Fe^2＋, as well as the rotor speed of super-gravity machine. When operating under the optimum condition, H2O2 and Fe^2＋ blended at the very edge of reactor inlet, and pH=2, H2O2 concentration was 0.2 mol/L, ratio of H2O2 to Fe^2＋4, and rotor speed being 1 400 r/min. When flow rates of H2O2 and Fe^2＋were the same 15 L/h and flow rate of NO of 500×10-6 was 200 L/h, NO removal efficiency could be as high as 75%.