Numerical simulation on formation of SO<sub>3</sub> during SNCR process in pulverized coal-fired boiler

SHEN Wenfeng; XIANG Baixiang; ZHANG Hai; ZHANG Yang; LÜ Junfu

doi:10.11949/j.issn.0438-1157.20170095

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Numerical simulation on formation of SO₃ during SNCR process in pulverized coal-fired boiler

更新时间：2025-12-10

- Numerical simulation on formation of SO₃ during SNCR process in pulverized coal-fired boiler
- CIESC Journal Issue 8, Pages: 3225-3231(2017)
- 作者机构：
  
  清华大学热能工程系, 热科学与动力工程教育部重点实验室,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170095
  CLC： K229.6
- Online First：05 August 2017，
  
  Published：05 August 2017
- 稿件说明：
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SHEN Wenfeng, XIANG Baixiang, ZHANG Hai, et al. Numerical simulation on formation of SO₃ during SNCR process in pulverized coal-fired boiler[J]. CIESC Journal, 2017, (8): 3225-3231. DOI: 10.11949/j.issn.0438-1157.20170095.
DOI：

SHEN Wenfeng, XIANG Baixiang, ZHANG Hai, et al. Numerical simulation on formation of SO₃ during SNCR process in pulverized coal-fired boiler[J]. CIESC Journal, 2017, (8): 3225-3231. DOI: 10.11949/j.issn.0438-1157.20170095. DOI：

摘要

基于详细化学反应机理，利用CHEMKIN-PRO软件中的平推流反应器研究了选择性非催化还原（SNCR）脱硝过程对SO3生成作用，以及烟气中SO2、NO、O2和H2O的体积浓度对SO3生成量的影响。结果表明，氨的注入改变了SO3生成机理和主要路径，明显促进烟气中SO2向SO3氧化。在NH3的体积浓度为300 μl·L-1、SO2的体积浓度为2000 μl·L-1、停留时间1.9 s内温度从1373 K降低至573 K时，生成的SO3体积浓度大于10 μl·L-1。随着SO2体积分数的降低，生成的SO3体积浓度减小，但转化率有所增加；此外生成的SO3体积浓度随O2体积浓度、NO体积浓度和停留时间的增加而增加，随着H2O体积浓度的增加而减小。燃用高硫煤时，SNCR对SO3的生成作用必须给予重视。

Abstract

A numerical investigation on the formation of SO3 during selective non-catalytic reduction (SNCR) process and the influences of the concentrations of SO2

and H2O were performed using the plug flow reactor of the CHEMKIN-PRO software with a detailed chemical kinetic mechanism. The simulation results showed that the presence of NH3 changed the formation mechanism and reaction pathway of SO3 and noticeably enhanced the formation of SO3. When the reaction temperature decreased from 1373 K to 573 K within 1.9 s residence time with inlet NH3 concentration being 300 μl·L-1 and inlet SO2 concentration being 2000 μl·L-1

the formation concentration of SO3 was above 10 μl·L-1. The SO3 concentration decreased while SO3/SO2 conversion ratio slightly increased with increasing inlet concentration of SO2. Meanwhile

SO3 concentration increased with increasing inlet concentrations of O2 and NO

and decreased with increasing H2O inlet concentration in the flue gas. Based on the study

the formation of SO3 during SNCR process should be paid attention when high sulfur coal was burned.

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Numerical simulation on formation of SO3 during SNCR process in pulverized coal-fired boiler

DOI：10.11949/j.issn.0438-1157.20170095

摘要

Abstract

关键词

Keywords

references

Numerical simulation on formation of SO₃ during SNCR process in pulverized coal-fired boiler