Generation of Droplets in Slag-Metal Emulsions through Top Gas Blowing
Generation of Droplets in Slag-Metal Emulsions through Top Gas Blowing
复制标题
DOI：
10.2355/isijinternational.43.983
复制
发表时间：
2003-07
影响因子：
1.8
通讯作者：
Subagyo;G. Brooks;K. Coley;G. Irons
中科院分区：
文献类型：
--
作者：
Subagyo;G. Brooks;K. Coley;G. Irons
利用铸铁-炉渣-氮气系统，在高温下对渣-金属-气体乳状液中金属液滴的撞击吹气行为进行了实验研究。建立了用于确定金属液滴的生成速度、尺寸分布和停留时间的乳化过程的数学模型，并用实验数据成功地进行了验证。研究发现，吹气惯性力与液态金属的表面张力和浮力的比值对金属液滴的生成速率和尺寸分布有很大影响。提出了一个新的无量纲数，即吹气数，它表示系统的惯性、表面张力和浮力之比，以及系统偏离Kelvin-Helmholtz准则所定义的稳定条件的程度。提出了金属熔滴的生成速度和尺寸分布与吹炼次数的函数关系。
The behavior of metal droplets in a slag-metal-gas emulsion through impinging gas blowing was investigated experimentally using a cast iron-slag-nitrogen gas system at high temperatures. A mathematical model of the emulsification process for determining the generation rate, size distribution, and residence time of metal droplets has been developed and successfully validated using experimental data. From the present work, it was found that the generation rate and size distribution of metal droplets is strongly influenced by the ratio of the inertial force of blown gas to the surface tension and buoyancy forces of the liquid metal. A new dimensionless number, i.e. blowing number, which represents the ratio of inertial to surface tension and buoyancy forces and also the departure of the system from its stable condition defined by the Kelvin-Helmholtz criterion, is proposed. A functional relationship of generation rate and size distribution of metal droplets with the blowing number is proposed.