化工进展 ›› 2021, Vol. 40 ›› Issue (2): 1069-1076.DOI: 10.16085/j.issn.1000-6613.2020-0708

• 资源与环境化工 • 上一篇    下一篇

低氮燃烧器的NOx排放性能及运行优化

陈旭(), 朱永郁, 陶军, 王春华()   

  1. 辽宁石油化工大学石油天然气工程学院,辽宁 抚顺 113001
  • 收稿日期:2020-04-29 修回日期:2020-05-26 出版日期:2021-02-05 发布日期:2021-02-09
  • 通讯作者: 王春华
  • 作者简介:陈旭(1974—),女,博士,教授,硕士生导师,研究方向为加热炉燃烧技术及管道腐蚀。E-mail:469428642@qq.com
  • 基金资助:
    国家自然科学基金(51804154);辽宁省教育厅科研项目(L2020028)

NOx emission performance and operation optimization of low nitrogen burner

Xu CHEN(), Yongyu ZHU, Jun TAO, Chunhua WANG()   

  1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China
  • Received:2020-04-29 Revised:2020-05-26 Online:2021-02-05 Published:2021-02-09
  • Contact: Chunhua WANG

摘要:

为降低锅炉氮氧化物(NOx)排放浓度,综合利用烟气内外循环、旋流燃烧、稳焰技术等原理,本文设计出一种适合燃气锅炉的扩散式低氮燃烧器。在2.8MW燃气锅炉上进行了工业试验,同时展开了数值计算。通过工业试验及数值计算表明:燃料消耗量、过量空气系数和烟气外循环率都影响着NOx的排放浓度,但三者影响程度不同。随着锅炉燃料消耗量的增加,NOx排放浓度增加;随着过量空气系数的增加,NOx排放浓度先增加而后降低;随着烟气外循环率的增加,NOx排放浓度降低。针对本燃烧器,当烟气外循环率控制在28%~40%范围内,过量空气系数只需满足燃气充分燃烧,NOx排放浓度都会低于30mg/m3;当烟气外循环率超过40%易出现燃烧不稳定现象,低于28%时,NOx排放浓度会高于30mg/m3,不能满足排放要求。

关键词: 天然气, 低氮燃烧器, 烟气循环, 污染, 数值模拟

Abstract:

In order to reduce NOx emission concentration of the boiler, a diffused low-nitrogen burner suitable for gas-fired boiler was designed by using the principles of flue gas internal and external circulation, swirl combustion and flame stabilization technology. The industrial experiment was carried out on the 2.8MW gas-fired boiler, and the numerical calculation was carried out at the same time. The industrial experiment and numerical calculation showed that fuel consumption, excess air coefficient and flue gas circulation rate all affect NOx emission concentration, but the influence degrees of the three are different. With the increase of fuel consumption, NOx emission concentration increases. With the increase of excess air coefficient, NOx emission concentration first increases and then decreases. With the increase of flue gas external circulation rate, NOx emission concentration decreases. For the burner here, when the flue gas external circulation rate is controlled within the range of 28% to 40%, the excess air coefficient only needs to meet the requirement of fuel complete combustion,the NOx emission concentration will be lower than 30mg/m3. When the flue gas external circulation rate is more than 40%, it is prone to combustion instability, and when it is lower than 28%, the NOx emission concentration will be higher than 30mg/m3, which cannot meet the emission requirements.

Key words: natural gas, low nitrogen burner, flue gas recirculation, pollution, numerical simulation

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