化工学报 ›› 2014, Vol. 65 ›› Issue (11): 4564-4570.DOI: 10.3969/j.issn.0438-1157.2014.11.050

• 能源和环境工程 • 上一篇    下一篇

水蒸气对oxy-coal燃烧中NO生成的影响

胡晓炜, 吴望晨, 姚洪   

  1. 华中科技大学煤燃烧国家重点实验室, 湖北 武汉 430074
  • 收稿日期:2014-04-14 修回日期:2014-06-09 出版日期:2014-11-05 发布日期:2014-11-05
  • 通讯作者: 姚洪

Influence of steam on NO formation during oxy-coal combustion

HU Xiaowei, WU Wangchen, YAO Hong   

  1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China
  • Received:2014-04-14 Revised:2014-06-09 Online:2014-11-05 Published:2014-11-05

摘要: 为了研究H2O对燃料N向NO转化各个阶段的影响,采用可沿程取样的沉降炉反应器,研究了一种烟煤在1273 K温度下,O2/N2、O2/CO2以及O2/CO2/H2O气氛下燃烧的燃尽与NO生成的情况.并通过在停留时间为0.2、0.3、0.5、1.1 s与O2浓度为5%、21%及30%情况下的实验来研究H2O对NO生成的影响.实验结果表明,相对于O2/CO2气氛,H2O的添加抑制了NO的生成,且该影响主要集中在燃烧初期挥发分N的氧化过程.随着O2浓度的增加,H2O添加对oxy-coal燃烧方式下NO生成影响加大.

关键词: 煤, 氧燃料燃烧方式, NO

Abstract: The influence of H2O on NO formation during oxy-coal combustion was investigated in a drop-tube furnace. A bituminous coal was selected and burnt at temperature of 1273 K under O2/N2, O2/CO2 and O2/CO2/H2O atmospheres, respectively. At different O2 contents 5%, 21%, and 30%, the samples were analyzed for increasing residence time from 0.2 s to 1.1 s. The results show that NO formation is suppressed by addition of H2O. The mechanism of NO reduction is due to the change of volatile-N chemistry with H2O addition. The H2O influence on homogeneous NO formation goes up with the increase of O2 concentration.

Key words: coal, oxy-coal combustion, NO

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