摘要
为了对水泥窑应用SNCR控制技术时CaO催化NH3氧化问题进行研究,该文采用固定床反应器,研究温度(650～950℃)、NH3体积分数(100×10-6～1500×10-6)和O2体积分数(0～4%)对于CaO催化NH3氧化作用的影响。采用Fourier变换红外光谱仪(FTIR)测量NH3和NO组分的体积分数。实验结果表明:CaO催化NH3氧化反应的转化率和产物NO的选择性随NH3体积分数增加而下降,随温度和O2体积分数增加而增加。基于NH3转化率和产物NO选择性随NH3体积分数的变化规律,提出CaO催化NH3氧化的首要途径是NH3和O2的吸附,吸附态NH3会与O2反应生成NO,而非前人提出的NH3与CaO反应生成CaN。采用该机理可以较好地解释实验规律。
This paper presents the NH3 oxidation catalyzed by CaO particles from using SNCR to control cement kiln NOx.Experiments in a fixed bed reactor showed the influence of temperature（650~950 ℃）,NH3 volume fraction（100×10-6~1 500×10-6） and O2 volume fraction（0~4%）.The experiments by an FTIR gas analyzer used to measure the NH3 and NO concentrations showed that the NH3 conversion and the NO selectivity decreased as the ammonia concentration increased.The NH3 conversion and NO selectivity increased as the temperature and O2 concentration increased.A reaction mechanism analysis showed that the reaction between the adsorbed NH3 and adsorbed O2 was the most important NO and N2 formation reaction.The reaction between NH3 and CaO to form CaN was of less importance.Reaction mechanisms agree well with the experimental results.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第6期831-835,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家“八六三”高技术项目(2006AA06A304)
