【摘要】 研究了不同料层高度下烧结过程中尾气成分(O2、CO2、SO2和NO)的变化规律.结果表明:随着烧结历程的推进,尾气中O2含量降低而CO2含量升高,这主要是因为固体燃料燃烧量逐渐增多;尾气中SO2、NO的含量亦呈升高趋势,但幅度很小,这主要是因为烧结料层对SO2有吸收作用,而燃烧带的CO气体则可以还原使部分NO分解;在临近烧结终点时,因料层对SO2的吸收作用消失而使析出作用强化,导致尾气中SO2含量急剧升高.另外,随着料层高度的增加,因固体燃料配比相应减小,尾气中CO2、SO2和NO的含量降低,而O2含量增加.因此,控制高温区宽度的厚料层烧结技术是我国开展减少烧结尾气中气体污染物(CO2、SO2和NO)的有效措施.更多还原

【Abstract】 The change in exhaust composition (such as O 2,CO 2,SO 2 and NO) at different bed depths in sintering process was studied.The results show that with the sintering process proceeding,the quantity of combustion solid fuel increases,therefore the content of O 2 decreases and the content of CO 2 increases.As SO 2 is absorbed by the sinter bed and NO is reduced by CO in the combustion zone,the contents of SO 2 and NO increase slowly.Near the burning through point,the absorption of SO 2 by the sintering bed disappears and the decomposability of SO 2 strengthens,leading to the rapid increase of SO 2 content.With the bed depth increasing,the ratio of solid fuel declines,therefore the contents of CO 2,SO 2 and NO decrease and the content of O 2 increases.So controlling the width of the high temperature zone in deep-bed sintering can efficiently reduce gaseous pollutants (CO 2,SO 2 and NO) in sintering tail gas.更多还原