那放 Abstract: The effects of gas compos頻秒itions on NOx reduction 金紙and NH3 slip by selective non-cat議制alytic reduction (SNCR老哥) with NH3 were investigated in a simulated ceme睡也nt precalciner atmosphere. The result林購s show that the presence of H2O improves NOx reduction and widens the短下 reduction temperature window si玩內gnificantly. O2 is indispensable for reduc器來ing NOx. The optimum reduct什女ion temperature decreases and t務靜he temperature window widens to a歌匠 lower temperature with the窗東 increase of O2 content. In addition, the increa輛紅se of O2 content also results in a decrease of t那嗎he maximum NOx reduction effi玩分ciency. The effect of SO2 on NOx reduction is negligible in 服男the simulated precalciner atmosphe風訊re. To increase CO conc議靜entration makes NO reduction關答 take place at relativel店吧y low temperatures. Howe姐這ver, NH3 will tend to be oxidized into NO 看錯instead of reducing NO after entering 北日the stream containing O2 at high temperatures if it is initia道些lly blended with a high concentrat人海ion of CO in an oxygen-free environment爸行. The increase of H2O, O2, SO2 or CO concentration is廠頻 helpful to reduce NH3 slip in the temperature region討多 below 900 °C. These eff兒劇ects are resulted from t遠地he fact that the generation and河山 consumption of O and OH radicals雜司 which are crucial to NO reduction問子 and formation can be influen拿地ced by the four gas compositions. In in長白dustrial operation of SNCR for cement 鐵事precalciner, these effects should b科服e taken into account to increase NOx re嗎很duction efficiency and avoi藍秒d NH3 slip.
