Abstract: The effects of gas c內很ompositions on NOx reductio知答n and NH3 slip by selective non-catalytic r房站eduction (SNCR) with NH3 were investigated in a木來 simulated cement pre時算calciner atmosphere. The re道金sults show that the pr身下esence of H2O improves NOx reductio空內n and widens the reduction te些海mperature window significantly. O2 is indispensable for reducing NOx. 船在The optimum reduction temperature 雪老decreases and the temperature w錢高indow widens to a lower temperature wit哥這h the increase of O2 content. In addition, the increa嗎制se of O2 content also results in a decreas市時e of the maximum NOx reduc一好tion efficiency. The effect of SO2 on NOx reduction is neg小事ligible in the simulated precalciner 男資atmosphere. To increase CO concentr花間ation makes NO reduc金也tion take place at relatively low t數現emperatures. However, NH3 will tend to be oxidized int舞要o NO instead of reducing NO aft報吃er entering the stream conta老為ining O2 at high temperatures if it i了城s initially blended with a high concent算習ration of CO in an oxygen-fr物票ee environment. The in她中crease of H2O, O2, SO2 or CO concentration is helpful to 書也reduce NH3 slip in the temperature region bel民話ow 900 °C. These effects are resulte信微d from the fact that the generation an跳西d consumption of O and OH radicals國體 which are crucial to照技 NO reduction and formation can be i媽窗nfluenced by the four gas compositions.弟玩 In industrial operati鄉坐on of SNCR for cement precalciner自森, these effects shou要嗎ld be taken into account to increase N東生Ox reduction efficiency and avoi物女d NH3 slip.
