水蒸气对oxy-coal燃烧中NO生成的影响  

Influence of steam on NO formation during oxy-coal combustion

作　　者：胡晓炜[1] 吴望晨[1] 姚洪[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《化工学报》2014年第11期4564-4570,共7页CIESC Journal

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。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.

关 键 词：煤 氧燃料燃烧方式 

分 类 号：X705[环境科学与工程—环境工程]