摘要
采用转杯粒化法将氯化镁破碎成小颗粒并进行余热回收,利用Fluent软件模拟研究了粒化后熔滴的冷却行为,以SST k-ω湍流模型和焓法模型为基础,分析了熔滴直径、初始速度及初始温度对熔滴冷却行为的影响规律.结果表明:氯化镁熔滴的直径越大,表面凝固时间和完全凝固时间越长,凝固速率的变化在凝固后期比凝固前期越小;熔滴的初始速度越大,凝固速率越快,表面换热能力越强,但换热能力的增幅随着初始速度的增大而下降;熔滴初始温度与完全凝固时间的相关性并不大,但较高的初始温度会延长熔滴表面凝固的时间.该研究结果可为转杯粒化氯化镁装置的结构设计提供参考.
Magnesium chloride can be broken into tiny droplets to recover waste heat by rotary cup atomizer,and the cooling behavior of the droplets after granulation has been investigated by using Fluent.The impact laws of droplet diameter,initial velocity,and initial temperature on the cooling behavior of molten droplets have been examined using the SST k-ωturbulence model and the enthalpy method model.The simulation results show three effects.The larger diameter of magnesium chloride droplet,the longer surface solidification time and completely solidification time,the smaller amount of solidification rate change in the later droplet than the earlier.The heat exchange on the surface of the melt droplet is stronger and the solidification rate is more quickly with higher initial velocities,but the reinforcement increase decreases as initial velocities increasing.The total solidification time is not strongly correlated with the molten droplet's beginning temperature,although a greater initial temperature lengthens the period of molten droplet's surface solidifcation.The results of the aforementioned study also serve as a guide for the structural layout of the rotating cup atomizer used in the granulation of magnesium chloride.
作者
赵传进
吴彦铮
刘军祥
于庆波
李光辉
Zhao Chuanjin;Wu Yanzheng;Liu Junxiang;Yu Qingbo;Li Guanghui(School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《材料与冶金学报》
CAS
北大核心
2023年第2期178-184,共7页
Journal of Materials and Metallurgy
基金
辽宁省大学生创新创业训练计划项目(S202110145027)
中央高校基本科研业务专项资金(N2225042).
关键词
转杯粒化
固相体积分数
熔滴冷却
rotating cup granulation
solid phase volume fraction
molten drop cooling
