化工学报 ›› 2018, Vol. 69 ›› Issue (9): 4037-4043.DOI: 10.11949/j.issn.0438-1157.20180377

• 能源和环境工程 • 上一篇    下一篇

不同尺寸反应器内H2O2热分解氧化NO特性与氧化产物分析

赵海谦1, 董明1, 汪怀远2, 刘立君1, 李栋1, 刘晓燕1   

  1. 1. 东北石油大学土木建筑工程学院, 黑龙江 大庆 163318;
    2. 东北石油大学化学化工学院, 黑龙江 大庆 163318
  • 收稿日期:2018-04-08 修回日期:2018-05-10 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: 刘晓燕
  • 基金资助:

    国家自然科学基金项目(51606036);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2016085);黑龙江省青年科学基金项目(QC2014C047)。

Characteristics and product generation pathway of NO oxidation by H2O2 thermal decomposition in different size reactors

ZHAO Haiqian1, DONG Ming1, WANG Huaiyuan2, LIU Lijun1, LI Dong1, LIU Xiaoyan1   

  1. 1. School of Civil Engineering & Architecture, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Chemistry and Chemical Engineering School, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
  • Received:2018-04-08 Revised:2018-05-10 Online:2018-09-05 Published:2018-09-05
  • Supported by:

    supported by the National Natural Science Foundation of China (51606036), Innovative Talents Training Plan for Youth Scholars in Heilongjiang Province (UNPYSCT-2016085) and Heilongjiang Science Funds for Youths (QC2014C047).

摘要:

采用实验方法研究了不同尺寸滴管炉反应器内H2O2热分解氧化NO特性。对比了不同H2O2蒸发条件对NO氧化率的影响规律。分析了气体温度、H2O2溶液浓度、H2O2:NO摩尔比、NO初始浓度及气体流量对NO氧化率的影响。检测了氧化产物并分析了产物的生成路径。结果表明:H2O2的快速蒸发是其热分解氧化NO的前提。减小H2O2液滴尺寸或液膜厚度可加速H2O2蒸发与分解,提高NO氧化率,扩宽NO氧化的温度范围。保证蒸发速率可削弱H2O2浓度对NO氧化率的影响。当H2O2:NO < 10时,NO氧化率随H2O2:NO的增加而增加;当H2O2:NO>10时,NO氧化率几乎不随H2O2:NO变化。H2O2热分解对于较高浓度的NO具有更高的氧化效率。H2O2热分解氧化NO的主要产物为NO2。HO2·直接将NO氧化为NO2,·OH则先将NO转化为HONO,然后进一步氧化为NO2

关键词: H2O2热分解, NO, 氧化, 蒸发条件, 反应器

Abstract:

Characteristics of NO oxidation by H2O2 thermal decomposition in different size reactors in drop tube furnaces were studied. The effects of different H2O2 evaporation conditions on NO oxidation ratio were compared. The effects of gas temperature, H2O2 concentration, H2O2:NO, initial NO concentration and gas flow rate on NO oxidation ratio were analyzed. The oxidation product was detected and the generation pathway of the product was analyzed. The results showed that the rapid evaporation of H2O2 was the precondition for NO oxidation by H2O2 thermal decomposition. Reducing H2O2 droplet size or liquid film thickness could accelerate H2O2 evaporation and decomposition rate which enhanced NO oxidation ratio and broadened the NO oxidation temperature range. Ensuring the evaporation rate of H2O2 decreased the effect of H2O2 concentration on NO oxidation. When H2O2:NO < 10, the NO oxidation ratio increased with the increase of H2O2:NO; when H2O2:NO>10, the NO oxidation ratio did not change with it. H2O2 thermal decomposition had higher oxidation efficiency for high concentrations of NO. The main product of NO oxidation by H2O2 thermal decomposition was NO2. HO2· directly oxidized from NO to NO2. However, ·OH converted NO to HONO firstly, and then further oxidized HONO to NO2.

Key words: H2O2 thermal decomposition, NO, oxidation, evaporation conditions, reactor

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