Experimental and modeling study of the effects of multicomponent gas additives on selective non-catalytic reduction process.
Experimental and modeling study of the effects of multicomponent gas additives on selective non-catalytic reduction process.
复制标题
DOI：
10.1016/j.chemosphere.2009.06.008
复制
发表时间：
2009-08
期刊：
影响因子：
8.8
通讯作者：
Qingxi Cao;Shaohua Wu;Hui Lui;Dunyu Liu;Penghua Qiu
中科院分区：
文献类型：
--
作者：
Qingxi Cao;Shaohua Wu;Hui Lui;Dunyu Liu;Penghua Qiu
在电热管式反应器中研究了多组分添加剂对选择性非催化还原NO过程的影响。多组分添加剂由CO、CH 4和H2两种物质组成，它们的摩尔比在1/3 ~ 3/1之间变化。结果表明，所研究的添加剂均能有效降低NO还原的最佳温度，但各组分的贡献不同。由CO和CH 4组成的多组分添加剂的性能主要取决于CH 4组分。CO组分的作用是使NO还原反应的温度窗口向低温方向移动，并使温度窗口变窄。由H2和CH 4组成的多组分添加剂的温度窗口与其各组分的温度窗口不同，因此H2和CH 4组分都有重要贡献。当它们所组成的多元添加剂中CO含量不超过H2时，H2组分对添加剂的性能起主导作用;当CO含量增加时，CO组分的影响变得显著。定性地，使用详细的化学动力学机制的建模结果表现出与实验观察到的温度窗口漂移相同的特性。通过反应机理分析，CO、CH 4和H2组分对多元添加剂性能的显著影响主要是由于它们各自氧化过程中OH自由基的产生速率不同所致。
The influence of multicomponent additives on NO reduction by selective non-catalytic reduction process has been investigated experimentally in an electricity-heated tube reactor. The multicomponent additives are composed of two species of CO, CH4and H2, and the molar ratio of their two components varies from 1/3 to 3/1. The results show that all the investigated additives could decrease the optimal temperature for NO reduction effectively, but the contributions of their components are different. The performance of multicomponent additive composed of CO and CH4depends mainly on CH4component. The function of CO component is shifting the temperature window for NO reduction to lower temperature slightly and narrowing the temperature window a little. The temperature window with multicomponent additive composed of H2and CH4is distinct from that with its each component, so both H2and CH4component make important contributions. While the fraction of CO is no more than that of H2in multicomponent additives composed of them, the performance of multicomponent additives is dominated by H2component; while the fraction of CO becomes larger, the influence of CO component becomes notable. Qualitatively the modeling results using a detailed chemical kinetic mechanism exhibit the same characteristics of the temperature window shift as observed experimentally. By reaction mechanism analysis, the distinct influences of CO, CH4or H2component on the property of multicomponent additive are mainly caused by the different production rates of OH radical in their own oxidation process.