湿烟气条件下丙烷在金属铁表面还原NO的特性

发布时间：2018-06-16 11:24

本文选题：NO还原 + 铁　；参考：《应用基础与工程科学学报》2016年06期

【摘要】：在N_2气氛和模拟烟气气氛条件下,研究了水蒸气对丙烷在金属铁表面还原NO的影响.实验采用电加热的陶瓷管流动反应器进行,反应温度为300~1 100℃.对反应后的铁样品的组分变化和表面微观结构变化进行了XRD和SEM分析.结果表明,水蒸气会使金属铁氧化,生成氧化铁.在N_2氛围中,600~850℃时水蒸气降低了丙烷在金属铁表面还原NO的效率.温度进一步升高后,铁被氧化后表面微观结构变得疏松多孔,从而使得NO气体能够进入孔隙内部进行反应,此时水蒸气对NO还原效率的削弱作用逐渐消失.在模拟烟气条件下,水蒸气有利于提高NO还原效率,特别是在贫燃料条件下.湿烟气条件下SO_2对丙烷在金属铁表面还原NO的影响很小.在相同条件下丙烷在金属铁表面还原NO的效率与甲烷进行了比较.结果表明以丙烷为燃料在金属铁表面还原NO,不仅效率相对较高,而且可以节省燃料的体积流量.在富燃料条件下,如SR_1=0.9时,在900℃时水蒸气体积含量为7.0%条件下,丙烷在金属铁表面还原NO的效率比甲烷高14%,而丙烷的用量只有甲烷的1/3.
[Abstract]:The effect of water vapor on the reduction of propane on the surface of metal iron was studied under the conditions of N_2 atmosphere and simulated flue gas. The experiment was carried out by a ceramic tube flow reactor with electric heating. The reaction temperature was 300~1 100 C. The change of the composition of the iron samples and the change of the surface microstructure were analyzed by XRD and SEM. The results showed that the steam was steamed with water. Gas will oxidize metal iron and produce iron oxide. In the atmosphere of N_2, water vapor reduces the efficiency of propane reduction of NO on the metal iron surface at 600~850 C. After the temperature is further elevated, the microstructure becomes porous and porous after the oxidation of iron is oxidized, thus making the NO gas able to enter the pores and react with the NO reduction efficiency at this time. The weakening effect gradually disappeared. Under the simulated flue gas conditions, water vapor could improve the reduction efficiency of NO, especially under the condition of poor fuel. The effect of SO_2 on the reduction of NO on the surface of metal iron under the condition of wet flue gas was very small. The efficiency of propane reduction of NO on the metal iron surface was compared with methane under the same condition. The reduction of NO on the metal iron surface can not only be relatively high in efficiency, but also to save the volume flow of fuel. Under the condition of rich fuel, when the volume content of water vapor is 7% at 900 C, the efficiency of propane reduction of NO on the metal iron surface is 14% higher than that of methane, and the amount of propane is only 1/3. of methane.
【作者单位】：东华大学环境科学与工程学院;
【基金】：国家自然科学基金项目(51278095)
【分类号】：X701

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