ABSTRACT: High-conc金暗entration CaO particles and gas c銀物ompositions have a significant influenc雨店e on NOx reduction by selective non靜內-catalytic reduction (SN票你CR) in cement precalciners. T科個he effect of gas composition o請作n NOx reduction by SNCR with NH₃ was 朋化studied in a cement precalciner通愛 atmosphere with and without C離新aO at 700-1100 °C. It was found that C厭去aO significantly lowers N身黑Ox reduction efficie又學ncy between 750 °C and 1000 °C, whic嗎鄉h is attributed to the低志 catalytic oxidation of NH₃醫工 to NO. Although increasing NH₃弟制 concentration was advant新制ageous to NOx reduction, the exist關相ence of CaO led to the op有讀posite result at 750-900農們 °C. Adding H₂O can suppress the 動南negative effect of Ca北長O on NOx reduction. Decreasing O₂ 南秒content from 10% to 1% shifts th黃得e temperature range in which CaO ha工理s a significant effect from 750-1相也000 °C to 800-1050 °C. C草畫O has a variety of inf街筆luences on the CaO effect u民空nder different experimental co很愛nditions. The influences o可在f NH₃, H₂O, O₂, and CO on the eff錢資ect of CaO can be attributed to他煙 the impacts of the gas compositio兒少ns on gas-phase NH₃ conversion近腦, gas-solid catalytic 車吧NH₃ oxidation, or both processes可但. A proposed pathway for the effe自木ct of gas compositions on NOx reduct媽笑ion in CaO-containing SNCR pro間你cess was developed that well 小國predicted the CaO-containing S跳遠NCR process.
