130 t/h四角切圆煤粉炉低氮燃烧改造的试验研究及数值模拟分析  

Experimental and Numerical Investigations on Effects of Low-NO_x Combustion in a 130 t/h Tangentially Firing Furnace of Pulverized Coal

作　　者：曹瑞杰 张健[1] 毕德贵[1] 张忠孝[1] CAO Rui-jie;ZHANG Jian;BI De-gui;ZHANG Zhong-xiao(Institute of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai,China,Post Code ：20009)

机构地区：[1]上海理工大学环境与建筑学院

出　　处：《热能动力工程》2018年第10期75-82,共8页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点研发计划(2018YFB0604202);上海浦江人才计划(16PJ1407800);上海高校青年教师培养资助计划(ZZslg16043)~~

摘　　要：运用试验研究及数值模拟方法，分析了130t／h四角切圆煤粉炉进行低氮燃烧改造后，空气分级对炉内火焰特性、NOx排放和灰渣结焦的影响。研究表明：分离燃尽风（s0FA）比率为24．8％时，燃烧器区域的平均燃烧温度下降120℃，SOFA风上部的烟气温度上升80℃；改造后锅炉NOx排放量下降了36．4％；CFD数值模拟与NOz实测排放的相对误差在±5％以内，证明了数值模拟的可靠性；随着SOFA比率的增大，燃烧器上部火焰切圆直径增大，较高温度下灰中结焦液体含量增多，反映了炉内SOFA风上部炉壁更易结焦，这与实际情况相符。Through a series of experiments and CFD numerical simulations, the influence of air staging on flame behavior,includlng NOx emission, temperature profiles and slagging,were investigated in a 130 t/h tangentially firing furnace of pulverized coal. The results showed that the average combustion temperature in the burner zone was reduced by 120 ℃ when SOFA wind ratio is 24.8% ,but the flue gas temperature increased by 80 ℃ above the SOFA nozzle. The NOx emissions were effectively decreased by 36.4% through the low-NOx combustion retrofit, i. e. , air staging and low-NOx burner. The relative error between CFD numerical simulation and NOx measured emission is less than 5% ,the CFD modeling was verified. With the increase of air distribution ratio in SOFA nozzle, the circle diameter of flame increases, which show the trajectories of pulverized coal or ash particles are much more near the wall and cause the slag- ging. with higher temperature, the liquid level in ash sample increases, indicating it is easier to have slag- ging near the wall above SOFA,which is consistent with experimental observation.

关 键 词：空气分级 数值模拟 NOX排放 结焦 

分 类 号：TK229.63[动力工程及工程热物理—动力机械及工程]