ABSTRACT: High-conc輛技entration CaO particles an房看d gas compositions ha多快ve a significant influence懂頻 on NOx reduction by selective n報問on-catalytic reducti懂店on (SNCR) in cement precalciners.光舊 The effect of gas composition on NOx 我文reduction by SNCR with NH₃ was studied 河筆in a cement precalci問他ner atmosphere with and with工紅out CaO at 700-1100 °C. It was f坐劇ound that CaO significantly lowers匠要 NOx reduction efficiency betw學錢een 750 °C and 1000 °C, which i錢會s attributed to the catalytic oxi鄉在dation of NH₃ to NO. Although increa廠答sing NH₃ concentration was靜問 advantageous to NOx reduction, t海他he existence of CaO led to t時月he opposite result at 750-900 °C.在離 Adding H₂O can suppress t低站he negative effect of CaO on NOx r子筆eduction. Decreasing O₂ content 數笑from 10% to 1% shifts the temperat厭老ure range in which CaO h她飛as a significant effect from 75討妹0-1000 °C to 800-1050 °C. CO has a va新討riety of influences on the 銀業CaO effect under different ex車文perimental conditions. The土討 influences of NH₃, H東員₂O, O₂, and CO on the effect of CaO c討輛an be attributed to the impacts 城謝of the gas composition相看s on gas-phase NH₃ conversion, gas來南-solid catalytic NH₃ oxidation, o內朋r both processes. A proposed 店照pathway for the effect of gas c還到ompositions on NOx reduct大海ion in CaO-containing SNCR process was舞雜 developed that well predicted the她著 CaO-containing SNCR process.
