摘要
通过实验测量了不同伴流温度和氧浓度条件下,DME-MILD射流火焰的热化学结构特性和NO_x分布及排放因子,并利用CFD-CRN多尺度数值方法,研究了DME-MILD火焰中NO_x的排放机理.数值仿真结合详细的NO_x反应机理进行计算,并采取反应路径和敏感性分析方法,阐明了炉膛不同区域内NO_x的排放机理.结果表明,在DME-MILD火焰中,NO_x主要经NNH和N2O中间体路径生成,这和传统射流火焰的差别很大.NO_x的排放因子随伴流温度或氧浓度的增加而增大,且有相当比例的NO(最高达87%,)最终转化为NO2.
Experiments were conducted to measure the thermo/chemical structure,NOx profile and emission index of the DME-MILD flame under different co-flow temperatures and oxygen concentrations.In addition,the CFD-CRN multi-dimensional numerical method was employed to study the NOx emission mechanism of the DMEMILD flame,which would provide theoretical references for practical application.The numerical simulation was performed with a detailed NOx formation kinetic mechanism.NOx emission mechanism in different subzones of the furnace was clarified by reaction path and sensitivity analyses.The results indicates that in the DME-MILD flame,NOx was mainly produced through the NNH-and N2 O-intermediate pathways,which is quite different from the formation of NOx in the traditional jet diffusion flame.The NOx emission index of the DME-MILD flame increased with the increase of co-flow temperature or oxygen concentration,and a considerable fraction of NO emission（87%, for the highest case）was converted to NO2.
作者
亢银虎
卢啸风
严谨
宋杨凡
孙思聪
Kang Yinhu;Lu Xiaofeng;Yan Jin;Song Yangfan;Sun Sicong(Key Laboratory of the Three Gorges Reservoir Region＇s Eco-Environment,Ministry of Education,Chongqing University,Chongqing 400045,China;Key Laboratory of Low-Grade Energy Utilization Technologies and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2018年第4期345-353,共9页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(51706027)
中国博士后科学基金资助项目(2016M590865)
中央高校基本科研业务费资助项目(106112016CDJXY210002)
作者简介
亢银虎（1985-）,男,博士,副教授.通讯作者：亢银虎,cqukangyh@cqu.edu.cn.
