ABSTRACT: 要煙High-concentration CaO particl生家es and gas compositions have a sign要外ificant influence on NOx re器請duction by selective non-catalytic錯校 reduction (SNCR) in cement p習房recalciners. The effect of能說 gas composition on NOx reduction by S草又NCR with NH₃ was studied術習 in a cement precalc暗要iner atmosphere with and witho秒來ut CaO at 700-1100 °C. It was found中訊 that CaO significantly lowers NOx redu化秒ction efficiency between 750 °C and 1時麗000 °C, which is attributed to the c件跳atalytic oxidation of 樂訊NH₃ to NO. Although incr湖喝easing NH₃ concentration 雨用was advantageous to NOx聽些 reduction, the exist她鐘ence of CaO led to the opposi光厭te result at 750-900 °讀村C. Adding H₂O can suppress the negat不的ive effect of CaO on年秒 NOx reduction. Decreasing女有 O₂ content from 10% to 1% shifts t醫體he temperature range in which CaO ha雨海s a significant effec對土t from 750-1000 °C to 800-10鄉去50 °C. CO has a variety of in快海fluences on the CaO effect under differ車人ent experimental conditions. 請來The influences of NH₃, H₂O, 火房O₂, and CO on the effect of他開 CaO can be attributed to學為 the impacts of the gas 爸近compositions on gas-森厭phase NH₃ conversion, gas-solid catal我相ytic NH₃ oxidation, or bo商船th processes. A proposed pathway for 花就the effect of gas composition樹市s on NOx reduction in 照們CaO-containing SNCR pr兒鐘ocess was developed that well 書頻predicted the CaO-containing 頻歌SNCR process.
