摘要
对某亚临界300MW机组锅炉的NOx排放特性进行数值模拟,研究过量空气系数、燃尽风率、浓淡侧煤粉浓度比、一次风速对炉内温度场和NOx排放量的影响。计算和分析结果表明:过量空气系数减小,NOx排放减少;燃尽风率增大,NOx排放量降低;一次风喷口浓淡侧煤粉浓度比增大,NOx排放量下降;一次风速加大,NOx排放量增加。按数值模拟结果进行调整后,锅炉的NOx排放量由471mg/m3下降为226.79mg/m3,降低幅度达52%。
Numerical simulation on NOx emission characteristic of a 300 MW subcritical coal fired boiler was performed.The effects of such factors as excess air coefficient,over fire air ratio,coal concentration ratio of coal rich side to the lean side and the primary air speed on the furnace temperature field and NOx emission was investigated.The results showed that,with a drop in excess air coefficient and an increase in over fire air ratio,the NOx emission decreased.The higher the coal concentration ratio of coal rich side to the lean side,the lower the NOx emitted.The increasing primary air speed resulted in high NOx emission.After regulation according to the simulation results,the NOx emission dropped by 52%,namely from 471 mg/m3 to 226.79 mg/m3.
出处
《热力发电》
CAS
北大核心
2013年第6期51-57,68,共8页
Thermal Power Generation
关键词
过量空气系数
燃尽风率
浓淡侧煤粉浓度比
一次风速
数值模拟
NOX排放量
excess air coefficient
over fire air ratio
coal concentration ratio
rich side
lean side
primary air velocity
numerical simulation
NOx emission
