电磁制动在中间包冶金中应用的基础研究

It is significant to control the fluid flow in the tundish to improve its performance so as to produce clean steel. Electromagnetic brake is a cleaner extra force which is a novel concept and research field to control fluid flow and heat transfer in tundish metallurgy. Physical and mathematical models are going to be built to investigate the effect of electromagnetic brake on fluidynamics and heat transmission in a tundish. Theories and models related to hydromagnetics, mass transfer, heat transfer, the motion, growth and removal of inclusions will be coupled to predict the flow field under difference electromagnetic fields with various magnitudes and locations. This work consists the following tasks: 1) a physical model is to be set up to investigate the flow field and particle trajectory under conventional flow control devices and electromagnetic forces; 2) establishing, validating and modifying a mathematical model base on physical study; 3) the mathematical model will be extended to study the impact of electromagnetic forces on the turbulent flow structures and temperature distribution, including the velocity field, temperature field and concentration field under the forces with different positions and intensities; 4) the motion, growth and removal of inclusions will be compared under electromagnetic forces. The purpose of present work is to investigate the fundamentals for the application of electromagnetic brake in tundish metallurgy.

通过控制连铸中间包内的钢液流动和传热行为来提高中间包的冶金效果是洁净钢生产技术的关键环节之一。电磁制动的外加力更为"洁净"，是中间包冶金的一个新的理念。 项目拟采用物理模拟和数值模拟的研究方法，通过整合磁流体力学、传质、传热、夹杂物运动、碰撞长大和去除等理论和模型，预测不同强度和分布的电磁力对中间包内湍流结构、传热和夹杂物去除的影响。主要工作包括：1）建立低温液态金属物理模型，对比研究传统控流装置和电磁制动力作用下对中间包内速度场和示踪粒子运动轨迹；2）在物理模拟的基础上，建立、验证和修正数值模拟模型；3）数值模拟探究电磁力作用下的中间包内的湍流结构和温度分布，主要包括电磁场位置和强度的组合（构成相应的电磁湍流抑制器、电磁墙和电磁坝）对其速度场、浓度场和温度场的影响规律；4）数值模拟电磁力作用下的夹杂物运动、碰撞长大和去除行为。项目的目标是探索和建立电磁制动技术应用于中间包冶金的理论基础。