摘要
某台300MW机组旋流燃煤锅炉通过增大燃尽风量的方法降低了炉内NOx的生成量。利用计算流体力学(CFD)软件对改进前后炉内的实际燃烧情况、燃烧产物的组分浓度分布以及NOx的生成规律进行数值模拟研究。结果表明,改进后主燃区内氧量减小,温度降低,CO浓度增大,使得炉内热力型NOx和燃料型NOx的生成量减少,有效抑制了NOx的生成,降低了锅炉的总体NOx排放量。
To control the NOx emission during combustion,reducing the tertiary air volume and enhancing the over fire air flow were to be adopted.Numerical simulation of the actual combustion situation,the concentration distribution of combustion products and the characteristic of NOx formation before and after retrofitting were performed by CFD software,for a 300 MW pulverized coal fired boiler.Results show that,after the improvement,oxygen content of the primary combustion zone reduces,the temperature decreases,and the CO concentration increases.Therefore,the formation of fuel-NOx and thermal-NOx both decreases,the retrofitting can effectively inhibit the NOx emission in boiler.
出处
《热力发电》
CAS
北大核心
2012年第7期13-16,21,共5页
Thermal Power Generation
关键词
锅炉
旋流燃烧
NOx生成量
数值模拟
三次风
燃尽风
combustion
pulverized coal
boiler
numerical simulation
NOx formation
tertiary air
over fire air
