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为了考察烧结过程中烧结矿各主要组分对NO脱除反应的影响,研究了有O2和无O2条件下CO还原NO的反应规律,并在还原性气氛下对烧结矿催化还原NO进行了动力学分析。在500~1 000℃,分别以CaO、MgO、Fe2O3和烧结矿为填料层,在固定床石英反应器中研究NO的脱除规律。研究结果表明,不同填料对CO还原NO反应催化作用的强弱顺序为CaO>烧结矿>Fe2O3>MgO。烧结矿作用下,CO体积分数为1.2%时,NO的转化率可达90%以上,CO还原NO反应的Arrhenius曲线以780℃为界分为两段,两段的反应机理不同。反应体系中O2存在时不利于NO还原反应的进行。
In order to investigate the effect of main components of sinter on NO removal during sintering, the reaction rules of NO reduction by CO with or without O2 were studied, and NO was catalyzed by sinter in a reducing atmosphere Analysis. At 500-1000 ℃, CaO, MgO, Fe2O3 and sinter were used as packed bed respectively to study the removal rule of NO in fixed-bed quartz reactor. The results show that the order of the catalytic effect of different fillers on the reduction of NO by CO is CaO> sinter> Fe2O3> MgO. Under the action of sinter, the conversion rate of NO can reach more than 90% when the volume fraction of CO is 1.2%. The Arrhenius curve of CO reduction NO reaction is divided into two sections at 780 ℃. The reaction mechanism of two stages is different. The presence of O2 in the reaction system is not conducive to the NO reduction reaction.