上海交通大学学报(自然版)

• 能源与动力工程 • 上一篇    下一篇

二甲醚选择性催化还原NOx的试验研究

闫应,张武高,陈晓玲,刘佳
  

  1. (上海交通大学 动力机械与工程教育部重点实验室, 上海 200240)
  • 收稿日期:2009-11-10 修回日期:1900-01-01 出版日期:2010-10-31 发布日期:2010-10-31

Experimental Study on Dimethylether SCR NOx Reduction

YAN Ying,ZHANG Wugao,CHEN Xiaoling,LIU Jia
  

  1. (Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2009-11-10 Revised:1900-01-01 Online:2010-10-31 Published:2010-10-31

摘要: 使用7% MoO3/γAl2O3(质量分数)为催化剂,对二甲醚(DME)作为还原剂选择性催化还原(SCR)降低NOx进行了试验研究.分别考察了反应温度、氧含量、DME与NO的比例对NO转化率的影响,测定了产物中的碳分布,并对NO与NO2分别作为NOx源进行了转化率比较.研究结果表明:常压条件下,在250~500 ℃内,随着反应温度的升高,NOx转化率先增大后减小;醚氮比对NO转化率的影响不明显;随着氧含量的增加,NOx转化率先增大后减小,当φO2=5%时,NO最高转化率约为53%;NO2比NO更容易被DME催化还原;含碳主要产物为CO、CO2,有少量甲醇(CH3OH)、甲醛(H2CO)生成.

关键词: 二甲醚, 转化率, 选择性催化还原

Abstract: Selective catalytic reduction (SCR) activity for NOx conversion to N2 over 7% MoO3/γAl2O3 (mass fraction) was investigated with Dimethylether (DME) as a reductant. The effects of the reaction temperature, DME/NO ratio as well as the oxygen inlet concentration were studied respectively. The carboncontaining product distributions were presented. NOx conversion with NO and NO2 respectively as NOx source was also investigated. The results show that between the range of 250℃ to 500℃, under atmospheric pressure, when operation temperature increases, NOx conversion increases at the beginning and then decreases. DME/NO ratio has a little impact on NO conversion. When the oxygen inlet concentration increases, NOx conversion increases at the beginning and then decreases, and the highest conversion rate of NO is about 53% when the oxygen inlet concentration is 5%. NO2 is easier for selective reduction than NO with DME as the reductant. The main carboncontaining products are CO and CO2, while a little CH3OH and H2CO have also been detected during the experiment.

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