W型火焰锅炉炉内空气动力场的实验研究

Experimental Investigation on Aerodynamic Flow-Fields of Double-Arch Flame Furnaces

本实验利用Thring-Newby模化方法对三种典型的W型火焰锅炉炉膛的空气动力场进行了分析研究.利用热线风速仪测得不同工况下不同炉型的炉内速度场图谱.实验结果证实;W型火焰炉内的空气动力场取决于拱顶风与前后墙侧风动量比,射流角度等运行参数和几何参数.同时得到不同配风方式下炉膛出口速度及炉膛上部丘段速度分布的规律.结果还表明,拱顶风与前后墙侧风动量比和炉膛几何形状对冷灰斗结渣及燃烧器附近的回流区大小有很大的影响.

Three typical aerodynamic flow field found in double-arch flame furnaces are experimentally studied by means of the Thring Newby modelling method. Velocity distribution fields of various furnaces under different conditions arc found with hot-wire velocity-meters. Experimental results show than the aerodynamic flow field in a double-arch flame furnace depands on certain operational and ueometncal parameters such as the ratio of momentum between primary and secondary air injection angles and so on Simultaneously furnace exit velocity and sectional velocity distribution in the furnace's upper part under defferent modes of air allocation is obtained. Experimental results also show that the size of the eddy current regions in vicinity of the burnners and ash hopper are strongly effected by the furnace's geometrical features and the momentum ratio between primary and secondary air. Figs 16 and refs 6.