Abstract：[Fe(NO)]2+ formed by the complexation between NO and Fe2+ was easily oxidized by O2 to NO2- and NO3-. Furthermore, NO2- and NO3- were reduced to N2 by urea in solution. Based on these reactions, we developed a new method for removing NOx in flue gas, i.e., complexation-oxidation-reduction method in which ferrous sulfate solution, oxygen and urea were selected as complex agent, oxidant and reductant respectively. Effects of some factors including initial concentration of urea, pH value of absorbing solution, initial concentration of NOx and flow rate of flue gas on removal rate of NOx in flue gas were investigated. Results showed that the removal rate of NOx was positive correlation with the initial concentration of urea and the initial concentration of NOx, but negative correlation with the pH value of absorbing solution and the flow rate of flue gas. When initial concentration of urea, pH value of absorbing solution, initial concentration of NOx and flow rate of flue gas were 1.19mol/L, 3.2, 1493mg/m3and 800mL/min respectively, the removal rate of NOx was more than 92% in the initial stage (0~6min) and this removal rate still maintained about 69% after treatment of NOx for an hour.
黎宝林, 李明玉, 刘海豪, 曹刚, 任刚, 宋琳, 叶向东. 络合-氧化-还原耦合方法脱除烟气中NOx的研究[J]. 中国环境科学, 2014, 34(5): 1125-1130.
LI Bao-Lin, LI Ming-Yu, LIU Hai-Hao, CAO Gang, REN Gang, SONG Lin, YE Xiang-Dong. Removal of NOx in flue gas by complexation-oxidation-reduction coupling method. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(5): 1125-1130.
