纳米TiO_2催化燃烧脱除氮氧化物的实验研究

Nano TiO_2 addition and effect on denitrogenation during coal combustion

对纳米TiO2催化CaO燃烧脱除氮氧化物进行了实验研究。探讨了纳米TiO2添加量、Ca/N摩尔比、燃烧温度及不同条件下制备的纳米TiO2对分析纯CaO脱除氮氧化物效率的影响。纳米TiO2添加剂,工艺条件变化对NOx脱除效率影响的变化规律:NOx脱除效率随着纳米TiO2含量的增加迅速增加,最佳比例为8%,单独脱除效率在36.5%,加入CaO后,脱除效率提升到40.6%;不同Ca/N,氮氧化物去除率不同,实验数据表明最佳Ca/N为1.22;燃烧温度对纳米TiO2的脱氮效率也有很大的影响,最佳燃烧温度为850℃;对于不同温度下合成的TiO2,750℃下合成的TiO2脱除效率最高。

Experiment research of nanometer TiO2 catalytic combustion to CaO denitrogenation was studied. The effects of analytical grade CaO denitrogenation by nanometer TiO2 addition, Ca/N molar ratio, nanometer TiO2 that prepared at different conditions and combustion temperature were discussed. The order of denitrogenation with different nanometer TiO2 and CaO additions is： the effect of denitrogenation markedly increased by adding more TiO2 addition, but the optimum proportion is 8 96, the efficiency of denitrogenation of nanometer TiO2 is 36.5 % ; after adding CaO, the effect reached 40.6 %, the experiment results showed that the optimum of Ca/N is 1.22; the effect of denitrogenation is infected largely by the combustion temperature , the optimistic combustion temperature is 850℃, comparing with synthetic TiO2 of different temperature, the 750℃ - synthetic - TiO2 has the best denitrogenation efficiency.