300MW机组切圆燃烧锅炉低氮燃烧改造  

Low NO_x combustion transformation for a 300 MW unit tangentially fired boiler

作　　者：张春华 王士桥 刘峰 

机构地区：[1]长安益阳发电有限公司,湖南益阳413000 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热力发电》2015年第3期124-128,共5页Thermal Power Generation

摘　　要：针对某电厂300 MW机组锅炉NOx排放浓度较高问题,采取采用低NOx煤粉燃烧器、设置合理的分离燃尽风、改进三次风燃烧器及紧凑式燃尽风(OFA)喷口、预置水平偏角的辅助风喷口(CFS)等措施对其进行了低氮燃烧改造。改造后在减温水量无明显增加的情况下,过热、再热蒸汽温度保持稳定,同样过量空气系数下,NOx排放浓度降低30%左右,锅炉飞灰可燃物、炉渣可燃物均有不同程度的降低,锅炉燃烧效率有所提高。NOxemission from a 300 MW unit boiler was relatively high. Thus,low NOxcombustion retrofitting was performed. Countermeasures include adopting the low NOxcoal burners,arranging reasonable separated over fire air,improving the tertiary air burner and compact over air（ OFA） nozzle,and presetting the auxiliary air nozzle with horizontal angles. After the transformation,under condition with nearly no change of the desuperheating water quantity,the temperature of superheated and reheated steam kept stable. With the same excess air ratio,the NOxemission decreased by about 30%,the combustible matter content in fly ash and slag reduced,and the combustion efficiency increased.

关 键 词：四角切圆锅炉 燃烧器 低NOX燃烧 空气分级 NOX排放 锅炉效率 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]