CFD simulation of low-temperature NO oxidation using ozone in sintering flue gas

Jiangyuan QU; Xiaolong LIU; Yanjun GUAN; Nana QI; Yang TENG; Wenqing XU; Tingyu ZHU; Kai ZHANG

doi:10.11949/0438-1157.20190418

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CFD simulation of low-temperature NO oxidation using ozone in sintering flue gas

Energy and environmental engineering | 更新时间：2020-06-24

- CFD simulation of low-temperature NO oxidation using ozone in sintering flue gas
- CIESC Journal Vol. 70, Issue 11, Pages: 4387-4396(2019)
- 作者机构：
  
  1.华北电力大学热电生产过程污染物监测与控制北京市重点实验室，北京 102206
  2.中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室，北京 100190
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190418
  CLC： X 511
- Received：21 April 2019，
  
  Revised：2019-08-16，
  
  Published：05 November 2019
- 稿件说明：
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曲江源, 刘霄龙, 关彦军, 齐娜娜, 滕阳, 徐文青, 朱廷钰, 张锴. 基于CFD模拟的臭氧低温氧化烧结烟气中NO过程分析[J]. 化工学报, 2019, 70(11): 4387-4396

QU Jiangyuan, LIU Xiaolong, GUAN Yanjun, QI Nana, TENG Yang, XU Wenqing, ZHU Tingyu, ZHANG Kai. CFD simulation of low-temperature NO oxidation using ozone in sintering flue gas[J]. CIESC Journal, 2019, 70(11): 4387-4396
曲江源, 刘霄龙, 关彦军, 齐娜娜, 滕阳, 徐文青, 朱廷钰, 张锴. 基于CFD模拟的臭氧低温氧化烧结烟气中NO过程分析[J]. 化工学报, 2019, 70(11): 4387-4396 DOI： 10.11949/0438-1157.20190418.

QU Jiangyuan, LIU Xiaolong, GUAN Yanjun, QI Nana, TENG Yang, XU Wenqing, ZHU Tingyu, ZHANG Kai. CFD simulation of low-temperature NO oxidation using ozone in sintering flue gas[J]. CIESC Journal, 2019, 70(11): 4387-4396 DOI： 10.11949/0438-1157.20190418.

摘要

以256 m

烧结机O

氧化烧结烟气中NO过程为研究对象，采用CFD数值模拟方法考察了含O

喷射气体与烧结烟气流动及NO低温氧化特性。通过与76步复杂反应机理的对比验证了11步简化机理的适用性，分析了反应温度、O

/NO摩尔比以及O

分布特性对NO氧化效率和不同价态NO

转化率的影响规律。通过对简单结构反应器的模拟结果表明：NO

稳定性较差，烟道内主要氧化产物为NO

与N

；随反应温度升高，NO氧化效率基本保持不变，NO

转化率提高且提升速率逐渐增大而N

呈相反规律；随O

/NO摩尔比增大，NO氧化效率提高但提升速率逐渐减小，NO

转化率先增大后在摩尔比高于1.25时开始减小，而各工况均产生N

且生成量逐渐增大，其原因为射流核心区可提供高O

/NO摩尔比条件；通过优化O

分布器结构改善O

与烟气接触与混合条件，O

与NO摩尔比为1.0、停留时间为0.87 s时NO氧化率可提高约12.8%，摩尔比为2.0、停留时间为1.73 s时N

转化率可提高约15.6%。

Abstract

The flue gas from a 256 m

sintering machine was selected to explore the characteristics of NO oxidized by ozone at low temperature. The flow characteristics of O

injection gas and sintering flue gas and NO oxidation characteristics were investigated by CFD numerical simulation method. By compared with 76-step complex reaction mechanism

11-step simplified mechanism was verified to be reasonable for the above process. The effects of process conditions

including reaction temperature

/NO molar ratio and O

distribution

on the conversion rates of NO

with different chemical valences were examined. The results from the simulation for the reactor

which is simple in structure

show that NO

and N

are the main oxidation products in the flue gas

whilst NO

is consumed due to its poor chemical stability. The oxidation efficiency of NO changes little with the increase of reaction temperature

the conversion rate of NO

increases and performs more significant change at higher temperature. However

the conversion rate of N

presents an opposite trend compared with that of NO

. With the raise of O

/NO molar ratio

the oxidation rate of NO increases slowly and that of NO

increases firstly and then decreases when the molar ratio higher than 1.25

while N

emerges in the condition even the O

/NO molar ratio less than 1.0 and the N

production increases gradually

resulting from a higher O

/NO ratio in the injection core regions. Furthermore

the structural optimization for the ozone distributor could improve the homogeneity of O

in the sintering flue gas. Afterwards the oxidation efficiency of NO increases by 12.8% approximately when the O

/NO molar ratio is 1.0 and the average residence time is 0.87 s

while the increase for N

conversion rate of about 15.6% was obtained when the O

/NO molar ratio is 2.0 and the average residence time is 1.73 s.

关键词

Keywords

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