生物柴油浸没喷吹的雾化特性

Atomization characteristics of biodiesel immersion blown

以生物柴油替代柴油进行浸没喷吹熔池熔炼是发展低碳铜冶炼的重要途径。针对该过程建立生物柴油浸没喷吹雾化流动过程计算模型,本文模拟计算了喷枪在水模型中浸没深度为20mm时不同油气比条件下生物柴油雾化颗粒的雾化特性,并实验验证了计算模型。研究结果表明:油滴颗粒的贯穿距随着空气流速的增加而增大;在气泡内油滴颗粒以一定的雾化半角向前扩散;当油滴颗粒到达气泡底部时,油滴颗粒以气泡底部平面为中心向整个空间扩散;气泡内距离喷枪轴向越远的观察面内大颗粒数目越多;油滴颗粒的索特平均直径(SMD)沿喷枪轴向先增大后减小;气泡内距喷枪口越远油滴颗粒SMD越大,进入水区域的油滴颗粒SMD逐渐减小;雾化空气流速越大,油滴颗粒SMD最大值的位置距喷口越远。

It is an important way to develop low-carbon copper smelting by using biodiesel instead of diesel oil. The calculation model of biodiesel immersion atomization flow process was established and the immersion depth of the spray gun was calculated in the water model. The atomization characteristics of the biodiesel atomized particles under different oil/gas ratios were studied and the calculation model was verified by experiments. The results indicated that the penetration of oil droplets increased with the increase of air flow rate. In the bubble the oil droplets spread with a certain half radius of smoke. When the oil droplets particles reached the bottom of the bubble,the oil droplets diffused from the bubble bottom plane as the center to the entire space. The farther from the axis of the gun in the area of interest,the more the number of large particles within the bubble. The SMD of the oil droplet particles increased first and then decreased along the axial direction of the spray gun. The greater the distance between the bubble and the nozzle,the larger the oil droplets SMD,and the droplet particles SMD in the water area gradually decreased. The higher the atomization air flow rate,the greater the position of the oil droplet particle SMD farther from the nozzle.