底吹气中间包内钢液流动及夹杂物去除模拟研究

通过40 t中间包的1:3水模型实验,对小方坯连铸6流中间包内钢液的流场进行了测定,研究了5种不同底吹气方案对中间包内钢液流动特性和夹杂物去除的影响。结果表明,在注流区吹气能延长钢水在中间包内的停留时间,减弱湍流强度,同时注流区内吹气可将气泡击碎成弥散小气泡促进了夹杂物上浮,夹杂物去除效果最佳。在近流与中流水口之间吹气,可改善各流的流动特性,中间包内的流动状况最佳,但近流处夹杂物去除效果略差。在中流和远流水口之间吹气,流场改善效果不理想。

A Study on Simulation of Fluid Flowing and Inclusions Removing for Liquid Steel in Tundish with Bottom Gas Blowing

The effect of five different bottom gas blowing scheme on flow characteristics of liquid steel and inclusions removing from steel in tundish has been studied by using 1: 3 water model-testing for a 40 t tundish to measure the flow field of liquid in tundish for 6 strands billet casting. Results show that the residence time of liquid in tundish is prolonged by gas blowing at injection flow area to decrease the turbulence intensity, while gas blowing at injection flow area is available to break the bubbles to form disperse small bubbles, promote inclusions floating up and get best inclusions removing effect ； the gas blowing at area between near flow nozzle and med. flow nozzle is available to improve flow characteristics, at this situation the flow condition of liquid is best but the inclusion removal at near nozzle area is lower ； and the gas blowing at area between med. flow nozzle and far flow nozzle is not an idea location to effectively improve the flow field.