精品人妻无码一区二区三区91,中文字幕亚洲欧美日韩不卡,久久国产精品成人无码网站,日韩无码黄色视频

Weiyi Fan, Tianle Zhu, Yifei Sun. Effects of gas compositions on NOx reduction by selective non-catalytic reduction with ammonia in a simulated cement precalciner atmosphere

發(fā)布日期:2020-04-21瀏覽次數(shù): 信息來源: Chemosphere

      Abstract: The effects of gas compositions on NOx reduction and NH3 slip by selective non-catalytic reduction (SNCR) with NH3 were investigated in a simulated cement precalciner atmosphere. The results show that the presence of H2O improves NOx reduction and widens the reduction temperature window significantly. O2 is indispensable for reducing NOx. The optimum reduction temperature decreases and the temperature window widens to a lower temperature with the increase of O2 content. In addition, the increase of O2 content also results in a decrease of the maximum NOx reduction efficiency. The effect of SO2 on NOx reduction is negligible in the simulated precalciner atmosphere. To increase CO concentration makes NO reduction take place at relatively low temperatures. However, NH3 will tend to be oxidized into NO instead of reducing NO after entering the stream containing O2 at high temperatures if it is initially blended with a high concentration of CO in an oxygen-free environment. The increase of H2O, O2, SO2 or CO concentration is helpful to reduce NH3 slip in the temperature region below 900 °C. These effects are resulted from the fact that the generation and consumption of O and OH radicals which are crucial to NO reduction and formation can be influenced by the four gas compositions. In industrial operation of SNCR for cement precalciner, these effects should be taken into account to increase NOx reduction efficiency and avoid NH3 slip.

鹿泉市| 枞阳县| 永定县| 阿克陶县| 左云县| 通江县| 新和县| 康平县| 阳朔县| 西林县| 禹城市| 信丰县| 土默特左旗| 海兴县| 平利县| 洞口县| 砀山县| 南郑县| 乐陵市| 广汉市| 杭锦旗| 礼泉县| 沾化县| 和平县| 曲水县| 东光县| 肃宁县| 法库县| 多伦县| 义乌市| 区。| 玉林市| 马尔康县| 闽侯县| 石狮市| 花莲县| 河南省| 高雄县| 昌图县| 姚安县| 应用必备|