钢包底喷粉元件狭缝粗糙壁面对粉气流输送行为影响

针对钢包底喷粉精炼新工艺,研究了底喷粉元件狭缝粗糙壁面对粉气流输送行为影响规律.通过分析颗粒-粗糙壁面的碰撞过程,提出了壁面粗糙角概率分布函数,建立了颗粒历史影响模型,基于欧拉-拉格朗日法,模拟研究了钢包底喷粉元件缝隙内粉气流输送行为,考察了壁面粗糙度对颗粒运动轨迹、颗粒速度分布及颗粒质量浓度分布的影响,预测了近壁面附近颗粒的运动轨迹.结果表明:粗糙壁面增加了颗粒壁面碰撞的频率,导致颗粒输送动能降低,脉动速度增加,并促使粉剂颗粒在底喷粉元件缝隙内均匀分布.

Effect of Slot Rough Wall on Transfer Behavior of Particle-Gas Flow in the Device of Ladle Bottom Powder Injection

For the new technology of ladle bottom powder injection， the effect of rough slot wall on transfer behavior of particle-gas flow was studied. A new probability distribution function of roughness angle was proposed by analyzing the process of particle-rough wall collision， and a particle history effect model was established to consider wall roughness effect. Based on the Eulerian-Lagrangian approach， this model was utilized to stochastically model the transfer behavior of particulate flow in the slot plug. The effect of wall roughness on particle trajectories， velocity distributions and particle mass concentrations was considered， and the trajectories of particles near the slot wall have been predicted successfully. The results indicate that roughness wall causes particles to collide on the wall with a higher frequency， which leads to the decrease of particle kinetics and the increase of fluctuation velocity. Moreover， roughness wall also causes a more uniform distribution of particles in the bottom powder injection device.