塔式低排放旋流器斜径向角对燃烧性能的影响

Influence of Oblique Radial Angle on Combustion Performance of a Low Discharge Cyclone Tower

针对原型燃烧室在贫预混燃烧情况下设计了一种塔式分级旋流器,旨在降低燃烧室出口的NO_(x)以及CO排放.通过使用Fluent软件进行数值模拟,研究了设计工况下塔式旋流器不同斜径向角对燃烧性能的影响.结果表明:斜径向角对燃烧效率的影响差异在0.1%以内,随着斜径向角的增大,燃烧室内回流区后中轴线温度逐渐降低;燃烧室高温区面积逐渐减小;总压损失呈先减小后增大的变化趋势,出口温度不均匀性OTDF值逐渐减小最低达25.82%;出口NO_(x)排放逐渐减小,低至33.9×10^(-6).综合来看,斜径向角为45°时燃烧室整体性能最优.

In order to reduce NOx and CO emission at the combustor outlet,a tower type classifier cyclone was designed for the prototype combustor under lean premixed combustion.The influence of different oblique radial angles on the combustion performance of tower cyclone was studied numerically by using Fluent software.The results show that the difference in the influence of oblique radial angles on combustion efficiency was less than 0.1%.With the increase of oblique radial angle,the temperature of the central axis behind the reflux zone in the combustion chamber decreased gradually.The high temperature area of the combustion chamber decreased gradually.The total pressure loss decreased first and then increased,and the OTDF value decreased gradually to 25.82%.The NO_(x)emissions at the outlet gradually decreased to as low as 33.9×10^(-6).In summary,the overall performance of the combustor is the best when the oblique radial angle is 45°.