摘要
立体分级低NOx燃烧系统,由低NOx燃烧器的燃料水平分级和高位燃尽风空气垂直分级技术有机耦合而成。本文利用CFD平台,对采用了立体分级低NOx燃烧系统的200 MW四角切圆锅炉燃烧和NOx排放特性进行了模拟,得到了炉膛内烟气温度场和燃烧产物的组分浓度分布,并对均等配风工况下的温度、氧量和NOx排放浓度与试验值进行对比,发现模拟值与试验值符合较好,验证了模型的合理性。同时,对比了主燃区二次风均等配风与倒塔配风两种配风方式对炉内燃烧和NOx排放特性的影响。结果表明,均等配风更利于降低NOx的排放,研究为立体分级低NOx燃烧系统改造效果的预报和应用提供重要参考依据。
A stereo- staged low NOx combustion system is consist of horizontal bias combustion （HBC） burners and over fire air （OFA）. Numerical simulation of the combustion process and NOx emission in a 200MW tangentially fired furnace with stereo - staged combustion system was performed on computational fluid dynamics software platform. The temperature field and the distribution of combustion species＇ concentration in the furnace were gained. The comparison between the simulation and the in- site test shows a good agreement. Furthermore, the effect of even and converse - pagoda shaped secondary air arrangements on combustion process and NOx emission was studied. The results show the even secondary air arrangements reduces more NOx. The numerical simulation can provide an important basis for the optimization and application of the stereo - staged low NOx combustion system in boilers.
出处
《节能技术》
CAS
2008年第4期305-308,362,共5页
Energy Conservation Technology
基金
国家十一五目标导向类项目“燃煤锅炉复合分级超低NOx排放燃烧技术”资金支持
关键词
立体分级
氮氧化物
燃尽风
数值模拟
stereo- staged combustion
NOx
over fire air
numerical simulation
