1025t/h四角切圆煤粉炉内空气过量系数对NO生成的影响

张俊霞; 郭雷雷; 宁少帅; 雷彻

doi:10.16803/j.cnki.issn.1004-6216.2017.02.015

环境保护科学

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张俊霞, 郭雷雷, 宁少帅, 雷彻. 1025t/h四角切圆煤粉炉内空气过量系数对NO生成的影响[J]. 环境保护科学, 2017, (2): 77-80. doi: 10.16803/j.cnki.issn.1004-6216.2017.02.015

引用本文:

Zhang Junxia, Guo Leilei, Ning Shaoshuai, Lei Che. Impact of Air Excess Coefficients on NO Generation in 1025t/h Tangentially-fired Boilers[J]. Environmental Protection Science, 2017, (2): 77-80. doi: 10.16803/j.cnki.issn.1004-6216.2017.02.015

Citation:

Zhang Junxia, Guo Leilei, Ning Shaoshuai, Lei Che. Impact of Air Excess Coefficients on NO Generation in 1025t/h Tangentially-fired Boilers[J]. Environmental Protection Science, 2017, (2): 77-80. doi: 10.16803/j.cnki.issn.1004-6216.2017.02.015

1025t/h四角切圆煤粉炉内空气过量系数对NO生成的影响

榆林学院能源工程学院, 陕西 719000

作者简介: 张俊霞(1974-),女,博士、副教授。研究方向:燃烧数值模拟。

基金项目:
陕西省科技厅工业攻关项目(2015GY099)基金资助
中图分类号: X701.7

Impact of Air Excess Coefficients on NO Generation in 1025t/h Tangentially-fired Boilers

School of Energy Engineering, Yulin University, Yulin 719000, China
Fund Project:

摘要: 文章采用计算流体力学软件Fluent数值模拟了1025t/h四角切圆煤粉炉内的湍流扩散燃烧,分析了空气过量系数对炉内烟气速度、烟气温度和氮氧化物组分的影响。结果表明:空气过量系数会对炉内流场的空气动力学特性和温度场分布均匀性产生显著影响。煤粉炉膛最佳空气过量系数为1.07,此时炉内温度场、速度场和浓度场的分布可使燃烧中间产物HCN和NH₃较好的将燃料型NO还原为N₂,来充分发挥空气分级燃烧降低NO排放的功效。
- 燃烧学 /
- 数值模拟 /
- 四角切圆煤粉炉 /
- 空气过量系数
Abstract: In this paper, Fluent software was applied to simulate a turbulent diffusion flame in a 1025t/h tangentially-fired boiler. Combustion characteristics were analyzed at various air excess coefficients, including gas velocity, gas temperature and nitrogen oxide composition. The results showed that the air excess coefficients significantly affected the air dynamic characteristics of the flow field and the distribution uniformity of the temperature field in the furnace. The optimum air excess coefficient was 1.07, at which there were fit temperature, velocity and concentration fields in the boiler which was helpful for the intermediate products HCN and NH₃ to reduce NO into N₂ during the generation of NO, indicating that the efficiency of NO emission reduction was achieved by means of air-staged combustion at air excess coefficients of 1.07.
- Combustion /
- Numerical Simulation /
- Tangentially-fired Boiler /
- Air Excess Coefficient

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Citation:

1025t/h四角切圆煤粉炉内空气过量系数对NO生成的影响

作者简介: 张俊霞(1974-),女,博士、副教授。研究方向:燃烧数值模拟。
榆林学院能源工程学院, 陕西 719000

收稿日期: 2016-11-09

基金项目:

陕西省科技厅工业攻关项目(2015GY099)基金资助

关键词:

摘要: 文章采用计算流体力学软件Fluent数值模拟了1025t/h四角切圆煤粉炉内的湍流扩散燃烧,分析了空气过量系数对炉内烟气速度、烟气温度和氮氧化物组分的影响。结果表明:空气过量系数会对炉内流场的空气动力学特性和温度场分布均匀性产生显著影响。煤粉炉膛最佳空气过量系数为1.07,此时炉内温度场、速度场和浓度场的分布可使燃烧中间产物HCN和NH₃较好的将燃料型NO还原为N₂,来充分发挥空气分级燃烧降低NO排放的功效。

English Abstract

Impact of Air Excess Coefficients on NO Generation in 1025t/h Tangentially-fired Boilers

School of Energy Engineering, Yulin University, Yulin 719000, China

Received Date: 2016-11-09

Fund Project:

Keywords:

Abstract: In this paper, Fluent software was applied to simulate a turbulent diffusion flame in a 1025t/h tangentially-fired boiler. Combustion characteristics were analyzed at various air excess coefficients, including gas velocity, gas temperature and nitrogen oxide composition. The results showed that the air excess coefficients significantly affected the air dynamic characteristics of the flow field and the distribution uniformity of the temperature field in the furnace. The optimum air excess coefficient was 1.07, at which there were fit temperature, velocity and concentration fields in the boiler which was helpful for the intermediate products HCN and NH₃ to reduce NO into N₂ during the generation of NO, indicating that the efficiency of NO emission reduction was achieved by means of air-staged combustion at air excess coefficients of 1.07.