ABSTRACT: High-con讀現centration CaO particles and gas大海 compositions have a significan上少t influence on NOx reductio城美n by selective non-cata數看lytic reduction (SNCR) in cem銀關ent precalciners. The e短歌ffect of gas composition on NOx redu藍銀ction by SNCR with NH₃ was stud間老ied in a cement prec輛錢alciner atmosphere with a信森nd without CaO at 700-1100 °C. It was 訊綠found that CaO significan科跳tly lowers NOx reduction efficiency水物 between 750 °C and 1000 °C, which i女間s attributed to the catalytic oxidatio們湖n of NH₃ to NO. Although increasing 音湖NH₃ concentration was adv明城antageous to NOx reduction, the 關我existence of CaO led 作務to the opposite result 麗多at 750-900 °C. Adding H₂O can suppress 有國the negative effect of下行 CaO on NOx reduction校明. Decreasing O₂ content from 事秒10% to 1% shifts the temperatur暗也e range in which CaO has a s技厭ignificant effect from 750-1000 °C to謝錢 800-1050 °C. CO has a variety of 做間influences on the CaO effect 她商under different experimen訊快tal conditions. The i近國nfluences of NH₃, H₂O, O₂, a地視nd CO on the effect of CaO can be attr歌討ibuted to the impacts of the g關窗as compositions on gas-p工厭hase NH₃ conversion, gas-sol雜購id catalytic NH₃ oxida金數tion, or both process通少es. A proposed pathway for t我有he effect of gas comp間村ositions on NOx reduction in CaO-co公制ntaining SNCR process was developed th去畫at well predicted the CaO-containin厭用g SNCR process.
