摘要
对DBC-OPCC-Ⅰ型旋流燃烧器进行了结构上的优化改造,并利用Fluent软件对改造前后的单个旋流燃烧器进行了数值模拟计算,分析了改造前后燃烧器区域的速度场、温度场以及NOx体积分数分布.结果表明:改造后的速度场出现中心回流区,且回流区在长度和宽度上均有所增加,速度明显减小;改造后的整体温度分布有所降低,最高温度降幅达200K,尤其是旋流燃烧器出口扩锥处的温度明显降低;改造后的NOx体积分数也显著降低,NOx最高体积分数可降1×106,改造后旋流燃烧器的性能比改造前优越.
An optimization retrofit was made to the structure of a DBC-OPCC-I swirl burner,to which numerical simulation was carried out before and after the retrofit using Fluent software,so as to analyze corresponding velocity field,temperature field and NOxconcentration distribution.Results show that a central recirculation zone appears in the velocity field after retrofit,and the recirculation zone increases both in length and width while reduces significantly in velocity values.The temperature drops entirely after retrofit,and the maximum temperature drop gets up to 200K,especially,the temperature drops obviously at the expansion cone of burner outlet.The NOxconcentration reduces significantly,and the maximum drop of NOxconcentration turns out to be 1×106.The performance of the optimized swirl burner is proved to be better than before.
出处
《动力工程学报》
CAS
CSCD
北大核心
2014年第4期260-266,共7页
Journal of Chinese Society of Power Engineering
关键词
旋流燃烧器
优化改造
温度场
NOx
数值模拟
swirl burner
optimization retrofit
temperature field
NOx
numerical simulation
