Abstract: The effects of gas composit多長ions on NOx reduction and NH3 slip by selective non-catalytic 愛畫reduction (SNCR) with NH3 were investigated in a s朋多imulated cement precalciner atmos機理phere. The results show that the 作頻presence of H2O improves NOx reduction and 聽校widens the reduction temperatu通朋re window significantly. 行跳O2 is indispensable for reducing NOx. The麗老 optimum reduction t區學emperature decreases and the tempe黑信rature window widens t但短o a lower temperature with美大 the increase of O2 content. In addition, the increase of 亮了O2 content also results in 村綠a decrease of the maximum NOx reducti不兒on efficiency. The effe河慢ct of SO2 on NOx reduction is negligible in t明玩he simulated precalci見要ner atmosphere. To increase CO她話 concentration makes NO reduction take 山離place at relatively low temp低吧eratures. However, NH3 will tend to be oxidized in文黑to NO instead of reducing NO after en花金tering the stream containi家內ng O2 at high temperatures if it is initial媽票ly blended with a high concentr頻秒ation of CO in an oxygen-free e資靜nvironment. The increase of H2O, O2, SO2 or CO concentration is hel短書pful to reduce NH3 slip in the temperature region below 90女金0 °C. These effects are re土黑sulted from the fact that th著懂e generation and consumption of O and 少笑OH radicals which are crucial t說區o NO reduction and form秒費ation can be influence船睡d by the four gas compositions. In indu黑會strial operation of SNCR南會 for cement precalciner, these e黃算ffects should be taken into a樹身ccount to increase NOx reductio物區n efficiency and avoid NH3 slip.
