不同雾化角燃油超低NOx燃烧器的大涡模拟  

Large Eddy Simulation of Fuel Ultra Low NOx Burners with Different Atomization Angles

作　　者：王雪 安恩科[1] 董沛 WANG Xue;AN Enke;DONG Pei(School of Mechanical and Energy Engineering,Tongji University)

机构地区：[1]同济大学机械与能源工程学院

出　　处：《上海节能》2023年第4期456-467,共12页Shanghai Energy Saving

基　　金：上海市科委项目“燃油锅炉脱硝新技术研究”(16dz1206305)。

摘　　要：采用大涡模拟方法分析不同雾化角对旋流非预混燃油低NOx燃烧器燃烧性能的影响。在充分燃尽的基础上,进行收敛性研究,对比分析两工况的温度场、速度场以及污染物排放情况,结果表明:大雾化角压力频谱低频段信息增加,燃烧室压力振荡强度增强,更易发生燃烧不稳定现象;雾化角的增大使得火焰集中分布在射流锥内侧,角回流区极少有火焰分布;大雾化角使得燃油径向雾化效果增强,轴向刺透深度减小,导致着火点提前,燃烧反应速率增大,使得炉膛最高温度升高,导致污染物排放水平升高。Using large eddy simulation method to analyze the effect of different atomization angles on the combustion performance of a low NOx swirl non premixed fuel burner.On the basis of sufficient burnout,conduct convergence research and compare and analyze the temperature field,velocity field,and pollutant emissions under two operating conditions.The results show that the low-frequency information of the pressure spectrum at high atomization angle increases,and the intensity of combustion chamber pressure oscillation increases,making it more prone to combustion instability;The increase in atomization angle causes the flame to be concentrated and distributed inside the jet cone,and there is very little flame distribution in the corner reflux zone.The large atomization angle enhances the radial atomization effect of fuel,reduces the axial penetration depth,leads to an earlier ignition point,increases the combustion reaction rate,and increases the maximum temperature of the furnace,leading to an increase in pollutant emission levels.

关 键 词：大涡模拟 雾化角 燃油燃烧器 NOx 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]