480t/h锅炉空气分级燃烧优化数值模拟  

Numerical Simulation of Air-staged Combustion on a 480t/h Boiler

作　　者：张凯峰[1,2] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]神华(福州)罗源湾港电有限公司,福建福州350512

出　　处：《发电与空调》2014年第2期8-11,共4页

摘　　要：为降低NOx排放,对某电厂480t/h锅炉空气分级燃烧改造数值模拟与优化,研究了分离燃尽风、切圆变化、煤粉细度变化对锅炉炉内温度场、NOx浓度分布和煤粉燃尽率的影响。模拟结果表明:空气分级改造后NOx排放浓度约为250mg/m3,较改造前降低约48%;切圆减小后,煤粉气流偏墙现象明显改善,水冷壁的结渣及高温腐蚀趋势降低;煤粉细度减小以后,煤粉燃尽率提高至97.56%,NOx排放浓度为248mg/m3,略有降低。In order to reduce NOx emission, a numerical simulation study was carried out on a 480 t/h boiler retrofitted with low NOx combustion system, in which the influence of SOFA, tangential circle and coal fineness to tempera- ture, NOx and burning rate of coal was researched. The results of simulation indicate that after retrofitting the amount of NOx emission concentration can be decreased to 250 mg/m^3, reduced by 48%. Through reducing tangential circle diameter the phenomenon of pulverized coal skew improve significantly, which can reduce slagging and high temperature corrosion of water wall. While the coal fineness deceased, the burning rate of coal increased to 97.56%, and NOx emission concentration was 248 mg/m^3, which is better than the initial condition.

关 键 词：氮氧化物 分离燃尽风 四角切圆直径 煤粉细度 数值模拟 

分 类 号：TM621.2[电气工程—电力系统及自动化]