二次风喷射角度对切向燃烧炉膛出口烟气流量偏差的影响

针对四角切向燃烧大容量锅炉普通存在的由于烟气残余旋转造成的上炉膛及对流烟道中的烟气流量左右两侧偏差问题进行了分析研究。并以一台４１０ｔ／ｈ锅炉为对象，用数值模拟方法，在原有设计方案基础上，改变某些流动参数，如不同的二次风喷射角度、最上层二次风反切流动，在计算机上进行模拟计算，分析总 模拟结果进而提出降低炉膛出口烟气速度偏差的可行方案。

The Effect of a Secondary Air Injection Angle on the Deviation of Flue Gas Flow Rate at a Tangentially Fired Furnace Outlet

In a tangentially fired large sized boiler there generally occurs a common phen o menon of flue gas flow deviation on the right and left side of both the upper fu rnace and the convection flue. This is generally attributed to the flue gas resi dual rotation. An analytical study was conducted to address this issue. Moreover , a 410 t/h boiler was selected as a specific object of study in this regard. By the use of a numerical simulation method and based on an initial design scheme, the authors have made changes in such flow parameters as secondary air injectio n angle and the secondary air inverse tangential flow at the furnace uppermost l ayer. After a summing up and analysis of the simulation results a feasible sche m e was proposed to lower the deviation of the flue gas speed at the furnace outle t.