带有旋流的RH精炼系统循环流动的实验研究

Experimental Investigation on Circulation Flow in RH Refining System with Swirling Flow

探讨RH真空脱气装置水模型上升管中施加旋流以提高系统精炼效率的可能性,分别采用平直叶片叶轮和轴流式叶轮产生旋流,通过水模型实验,比较有旋流和无旋流上升管中气液两相流体流动现象的差别.利用超声波流量计测量系统的循环流量,利用摄像机记录气液两相流动状态.水模型实验结果表明,与无旋流情况相比,施加旋流后循环流量显著增大.由于向心力作用,气泡向管道中心区域积聚,从而使气泡与杂质物碰撞合并的机会大大增加;同时还能够避免气泡吸附在管壁上,提高RH真空精炼装置的寿命.

Investigation on the possibility of the improving the refining efficiency by applying swirling flows in the up-leg of RH refining process, the swirling flows are produced by using the impeller with the six plane blades and axial flow impeller.Difference of gas-liquid flow phenomena between without and with the swirling flow is analyzed using the water model experiments. The ultrasonic flowmeter is used to measure the circulation flow rate. A video recorder is used to record the two phase flow patterns. The water model experiments show that the circulation flow rate with swirling flow increases significantly. Caused by the centripetal force, the gas bubbles and the inclusions, whose densities are smaller than that of liquid, concentrated on the central zone of the up-leg. Where the collision and the coagulation of the bubbles and the inclusions can be increased remarkable. The attachment of the bubbles on the inner walls of the up-leg of RH vessel is also avoided. Thus the life of the RH vessel can be improved.