RH-MFB真空精炼过程中循环流量的物理模拟研究

Study on circulation flow rate in water model of RH-MFB vacuum refining process

在120tRH MFB多功能真空精炼装置1∶5 45比例的水模型上,采用毕托管测定下降管内钢水流速,从而测定循环流量的方法,研究了真空循环精炼过程中钢液的环流特性.考察了该冶金反应器主要结构参数和工艺操作因素,包括插入管内径、驱动气体流量、驱动气体用喷嘴个数及其布置、驱动气体引入位置(气泡行程)、插入管浸入深度、钢水处理容量等对循环流量的影响关系.结果表明,循环流量随插入管内径、驱动气体流量、驱动气体用喷嘴个数、气泡行程、插入管浸入深度的增加而加大.

The flow characteristics and circulating flow rate of the vacuum refining process were investigated on a 1∶5.45 water model of a 120 t RH-MFB unit. Pitot tube was used to masure the velocity of fluid flow in the down-snorkel, and then to calculate the circulation flow rate. The influences of the main process and structure factors such as the lifting gas flow rate, the diameter of up and down snorkels, the number and distribution of nozzles etc., were considered and examined. The resuts show that the circulation flow rate of the vacuum refining process increases with the increase of the lifting gas flow rate, the diameter of up and down snorkels, the number of nozzles and the immersion-depth of the snorkels.