煤粉炉SNCR对SO3生成影响的数值模拟

doi:10.11949/j.issn.0438-1157.20170095

化工学报 ›› 2017, Vol. 68 ›› Issue (8): 3225-3231.DOI: 10.11949/j.issn.0438-1157.20170095

煤粉炉SNCR对SO₃生成影响的数值模拟

沈文锋, 向柏祥, 张海, 张扬, 吕俊复

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

收稿日期:2017-01-20 修回日期:2017-03-08 出版日期:2017-08-05 发布日期:2017-08-05
通讯作者: 张海
基金资助:
国家自然科学基金项目（51476088）。

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

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

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2017-01-20 Revised:2017-03-08 Online:2017-08-05 Published:2017-08-05
Supported by:
supported by the National Natural Science Foundation of China(51476088).

摘要/Abstract

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。

关键词: 选择性非催化还原, 氨, 二氧化硫, 三氧化硫, 平推流反应器

Abstract:

A numerical investigation on the formation of SO₃ during selective non-catalytic reduction (SNCR) process and the influences of the concentrations of SO₂, NO, O₂, 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.

Key words: selective non-catalytic reduction, ammonia, sulfur dioxide, sulfur trioxide, plug flow reactor

中图分类号:

TK229.6

沈文锋, 向柏祥, 张海, 张扬, 吕俊复. 煤粉炉SNCR对SO₃生成影响的数值模拟[J]. 化工学报, 2017, 68(8): 3225-3231.

SHEN Wenfeng, XIANG Baixiang, ZHANG Hai, ZHANG Yang, LÜ Junfu. Numerical simulation on formation of SO₃ during SNCR process in pulverized coal-fired boiler[J]. CIESC Journal, 2017, 68(8): 3225-3231.

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煤粉炉SNCR对SO₃生成影响的数值模拟

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

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