摘要
配风方式是影响煤粉燃烧过程NOx排放的关键因素。对非设计配风条件下W火焰锅炉NOx排放特性进行深入研究具有重要意义。应用CFX-TASCFLOW软件对一台现役300MW机组W火焰锅炉进行了数值模拟,利用现场运行数据验证了基础工况数值模拟的准确性。进行了18种非设计配风工况炉内燃烧数值模拟,计算与分析结果表明:前后拱上一次风量比在大于5∶6与小于6∶5范围内变化时,前后拱一次风量偏差对NO生成有显著影响,一次风速增加使得NOx的排放浓度降低。
The air distribution pattern is a key factor influencing the NOx emissions in a pulverized coal combustion process. It is of major significance to study in depth the NOx emission characteristics of a boiler with a W-shaped flame under the condition of an off-design air distribution. By using software CFX-TASCFLOW,a numerical simulation was conducted of a 300 MW plant with the above boiler in active service. The on-site operating data were used to verify the accuracy of the numerical simulation results at the base load condition. The in-furnace combustion was numerically simulated at 18 off-design air distribution operating conditions. The calculation and analysis results show that when the primary air ratio of the front and rear arch changes in a range of more than 5:6 and less than 6:5,the difference of the primary air flow of the front and rear arch will exercise a notable influence on NO production. An increase of the primary air speed will lead to a reduction of the NOx emissions concentration.
出处
《热能动力工程》
CAS
CSCD
北大核心
2010年第1期57-60,共4页
Journal of Engineering for Thermal Energy and Power
关键词
W火焰锅炉
配风
数值模拟
NOX排放
flame boiler,air distribution,numerical simulation,NOx emission
