RH真空精炼循环流动流场结构的数值模拟

为研究RH真空脱气过程中的流动行为,基于欧拉-欧拉两流体模型,建立了描述气泡驱动下的RH循环气-液两相流动的数学模型.采用计算流体力学(CFD)商业软件FLUENT6.0,应用所建理论模型对真空室和钢包内的流动进行了数值模拟,得到真空室内及钢包内的流动规律与实验结果基本一致.对流场结构的分析发现其中存在内部相对独立的回旋流动区域,会降低整体循环效率.RH设备的几何结构参数和充气参数的优化与匹配设计是未来改善循环流动结构、提高循环效率的关键.

Numerical Simulation of Circulating Flow Field Structure in RH-Refining Process

A two-phase flow mathematic model based on Eulerian-Eulerian approach was developed to investigate the flow behavior of the Ruhrstahl Heraeus (RH) degassing process driven by bubbles. The liquid velocity distribution in vacuum chamber/ladle was simulated numerically by the CFD (commercial computational fluid dynamics) code FLUENT 6.0, and it was found that the theoretically simulated results of flow behavior in vacuum chamber/ladle conforms basically to the experimental results. Analyzing the structure of such a flow field, several swirling zones are found separated from the main circulating flow in vacuum chamber/ladle, which could reduce the circulating efficiency in refining process on the whole. The optimization of geometric and gas-charging parameters of RH system and matching them well in design will be crucial to improving the circulating flow field structure and recycling efficiency.