O2/CO2气氛下CO对煤焦异相还原NO影响的研究

为揭示O₂/CO₂燃烧过程中高浓度的CO对煤焦异相还原NO的影响,在1073 K温度下使用山西褐煤在卧式炉上进行了实验。分别对O₂/CO₂浓度比及CO浓度下NO的还原特性进行详细实验研究。研究结果表明:在O₂/CO₂气氛下,O₂浓度为30%时具有较高的还原率;相同O₂浓度下O₂/CO₂气氛较空气气氛NO还原率高,表明在CO存在的条件下,高浓度的CO₂会促进NO的还原;当CO浓度从1.5%逐渐升高时,NO的还原率逐渐降低,到CO浓度为5%时,NO还原率比没有加入CO时还要低,而在空气气氛下CO浓度的变化对NO的还原率影响较小。

Investigation on Effect of CO on NO Heterogeneous Reduction With Char in O2/CO2 Atmosphere

To reveal the effect of high concentrated CO on NO heterogeneous reduction with char during the process of O₂/CO₂ combustion,combustion experiments of Shanxi lignite were carried out on a horizontal furnace at 1073 K.NO reduction characteristics under different O₂/CO₂ concentration and CO concentration were discussed.The results showed that high efficiency of NO reduction had been obtained when O₂ concentration was 30%in O₂/CO₂ atmosphere.The reduction efficiency of NO was much higher in O₂/CO₂ atmosphere than that of in air at the same O₂ concentration,which indicated that high CO₂ concentration will promote the catalytic reduction of NO on char surface with the presence of CO.Reduction efficiency of NO decreased as the concentration of CO rose from 1.5%.However,the reduction efficiency of NO under 5%CO was even lower than that of no CO was added.In addition,NO reduction was less affected by the variation of CO concentration in air condition.