420 / 2018-12-26 10:26:03

Experimental and numerical research on a novel low-NOx swirl pulverized-coal burner

Numerical simulation ; Recirculation zone; Air distribution;Thermal test

全体主题 > 锅炉

低NOx旋流燃烧器数值模拟与试验研究
沈涛,于强,张超,宋振宇,赵明潇,朱绘娟
哈尔滨锅炉厂有限责任公司；
黑龙江 哈尔滨150046；
（Tel:0451-82199923,Email:shen1390498@126.com）
摘要：旋流燃烧能够有效强化高温燃烧产物和未燃烧燃料在回流区的混合过程，并形成稳定的点火源，从而使火焰稳定，也是降低NOx排放的有效手段之一。它具有燃烧室结构紧凑，燃烧火焰稳定性好，节能、高效、低污染，燃烧器负荷调节比大等优势，还可以控制火焰的形状，改变火焰的扩张角和射程。本文通过数值模拟对低NOx旋流燃烧器的空气动力场及风箱内燃烧器的风量分配进行计算，并结合试验数据加以验证和对比，研究不同叶片角度对冷态回流区、热态NOx和CO的影响；研究表明：旋流燃烧器的冷态回流区随着叶片角度的增大而增大；二次风箱内每只燃烧器的风量分配是不均匀的；热态NOx随着叶片角度的增大而减小，随二次风门开度的增大呈先增加后稳定，随氧量浓度的增大而增加。
关键词：旋流燃烧器；数值模拟；回流区；风量分配；热态试验

Experimental and numerical research on a novel low-NOx swirl pulverized-coal burner
T.Shen,Q.Yu,C.Zhang,Z.Y.Song,M.X.Zhao,H.J.Zhu
Harbin Boiler Company Limited；
Heilongjiang Harbin150046；
（Tel:0451-82199923,Email:shen1390498@126.com）
Abstract: Swirl combustion can effectively enhance the mixing process of high temperature combustion products and unburned fuels in the recirculation zone,and then form a stable ignition source, thus stabilizing the flame and also one of the effective means to reduce NOxemission.It has the advantages of compact combustion chamber structure ,good combustion flame stability ,energy saving ,high efficiency,lowpollution,high load regulation ratio of burner,and can control the shape of flame ,change theexpansionangle and range of the flame.In this paper,the aerodynamic field of the low NOx swirl burner and the air distribution of the burner in the bellows are calculated by means of numerical simulation, and the effects of different blade angles on the cold back flow zone ,the thermal NOx and CO are studied by the comparision with the experimental data.The experimental results show that the cold recirculationzone of swirl burner increases with the increase of blade angle,The air distribution of each burner in the two-time bellows is uneven, and the thermal NOx decreases with the increase of the blade angle，and increases and then becomes stable with the increase of the opening degree of two-time damper,and increases with the increase of oxygen concentration.
Keywords:Swirl burner ; Numerical simulation ; Recirculation zone; Air distribution;Thermal test