摘要
针对FW型W火焰锅炉燃尽性差、飞灰含碳量高、NOx排放浓度高等问题,提出了高效低氮燃烧系统改造方案,并以某FW型W火焰锅炉为模型进行了数值模拟计算,对比分析了低氮燃烧系统改造前后炉膛空气动力场、温度场、煤粉颗粒轨迹及NOx分布特点。结果表明,改造后NOx排放浓度由1 158.9mg/m3降至793.4mg/m3,炉膛出口烟气温度由1 126℃降至1 075℃,炉膛温度分布均匀,减温水流量和蒸汽温度偏差减小,提高了锅炉燃烧的稳定性和安全性。
To solve such problems as poor burnout characteristics,high fly ash content and high NOx emis-sion concentration occurred in FW type down fired boilers,a high efficient transformation scheme for low NOx combustion system was proposed.Moreover,an FW type W-shaped flame boiler was taken as the model to carry out the simulation.The aerodynamic field,temperature field,coal particles traj ectory and NOx concentration distribution before and after the low NOx optimization retrofitting were comparatively analyzed.The results show that,after the transformation,the NOx emission decreased from 1 158.9 mg/m3 to 793.4 mg/m3 ,the furnace outlet gas temperature dropped from 1 126 ℃ to 1 075 ℃,the temperature field in furnace had good uniformity and the deviation of the desuperheating water quantity and the steam temperature reduced,which enhanced the stability and safety of the combustion.
出处
《热力发电》
CAS
北大核心
2014年第12期31-37,48,共8页
Thermal Power Generation
基金
国家科技部支撑计划项目(2011BAA04B01)
关键词
W火焰锅炉
低氮燃烧
N
Ox
排放
烟气温度
蒸汽温度
减温水流量
数值模拟
W-shaped flame boiler
low NOx combustion
NOx emission
flue gas temperature
steam temper-ature
desuperheating water quantity
numerical simulation
