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首页> 外文期刊>RSC Advances >Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations
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Mechanistic study on NO reduction by sludge reburning in a pilot scale cement precalciner with different CO2 concentrations

机译：不同CO2浓度的中试水泥分解炉中通过污泥再燃减少NO的机理研究

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An experimental study on the effects of CO _(2) concentration on the release of reducing gases and the NO reduction efficiency by sludge reburning was carried out in a pilot scale cement precalciner. The results indicate that sludge reburning shows an ideal NO reduction activity. The best NO reduction efficiency of 54% is reached when the CO _(2) concentration is 25 vol%. Characteristic analysis of the sludge shows that the main types of reducing gases generated by sludge reburning are HCN, NH _(3) , CO and CH _(4) . Among them, CO _(2) concentration plays a crucial role in the release of HCN, CO and CH _(4) . The mechanistic study indicates that NO reduction is dominated by homogeneous reduction during the sludge reburning process, in particular the reducing gases of CO and NH _(3) have significant influences on the NO reduction. Meanwhile, the effect of CO _(2) concentration on NO reduction is mainly due to the difference in CO release. The results of the present study not only provide insight into the mechanism of NO reduction by sludge reburning, but could also contribute to the development of NO _( X ) removal technology in the cement industry.
机译：在中试规模的水泥分解炉中进行了CO_（2）浓度对还原气体释放和污泥再燃的NO还原效率影响的实验研究。结果表明，污泥再燃显示出理想的NO还原活性。当CO _（2）浓度为25 vol％时，最佳的NO还原效率达到54％。对污泥的特性分析表明，污泥再燃产生的还原性气体的主要类型为HCN，NH_（3），CO和CH_（4）。其中，CO_（2）浓度在HCN，CO和CH_（4）的释放中起关键作用。机理研究表明，污泥再燃过程中NO的还原主要由均相还原决定，特别是CO和NH _（3）的还原气体对NO的还原有重要影响。同时，CO_（2）浓度对NO还原的影响主要是由于CO释放的差异。本研究结果不仅为深入研究污泥再燃减少NO的机理提供了依据，而且还为水泥工业中NO_（X）去除技术的发展做出了贡献。

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