球团竖炉结构影响炉内气流分布的实验研究

Experimental Study on Gas Flow Distribution Affected by Constructional Parameters of Pelletizing Shaft Furnaces

根据相似原理建立了球团竖炉冷态模型实验台,依据实验数据绘制流网图,通过流网图判断炉内气流运动,从而得到竖炉结构参数对气流分布的影响规律·结果表明,结构参数中,导风墙宽、焙烧带宽、冷却带宽、焙烧带高、均热带高和冷却带高等是影响气流分布的主要因素,其中,导风墙宽增大,或焙烧带宽减小,或火口中心线上料层增高,则上行冷却风趋势减小,下行焙烧风趋势增大,临界流入风量比k 减小;反之,上行冷却风趋势增大,下行焙烧风趋势减小,k 增大;此外,焙烧带宽是影响气流分布均匀性的主要因素·此研究结果可指导竖炉的初始设计和生产参考,尤其供竖炉的计算机辅助设计参考·

Pelletizing shaft furnace(PSF) is usually used to produce acidic pellet in China. A cold-state experimental set-up was built according to the principle of similitude, and then the flow-net diagrams with different constructional parameters were plotted to make sure of the gas flow distribution in PSF and how the gas flow distribution is affected by the constructional parameters. The results showed that among such constructional parameters the widths of vertical air internal channels, roasting zone and cooling zone and the heights of roasting zone, soaking zone and cooling zone are the main influencing factors on gas flow distribution in PSF. In case the width of internal channels or the height of roasting zone is increased or the width of roasting zone decreased, the upward cooling gas tends to decrease while the downward roasting gas tends to increase with the critical ratio of inflow k~* decreased gradually, and vice versa. It is important that the width of roasting zone is the key influencing factor on the uniformity of gas flow distribution in PSF. The results as above can be applied to the initial design of PSF especially in CAD.