高温铜渣风淬造粒实验研究及铜渣液滴冷凝过程的数值模拟  

Experimental study on air-quenching granulation of high-temperature copper slag and numerical simulation of cooling and solidification process of copper slag droplet

作　　者：戴鹏飞 张斌 黎显俊 尹一鸣 吴怡康 李明周[1] DAI Pengfei;ZHANG Bin;LI Xianjun;YIN Yiming;WU Yikang;LI Mingzhou(School of Metallurgyical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Energy Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]江西理工大学冶金工程学院,江西赣州341000 [2]中南大学能源科学与工程学院,长沙410083

出　　处：《有色金属科学与工程》2024年第5期650-659,共10页Nonferrous Metals Science and Engineering

基　　金：江西省科技厅自然科学基金项目(20212BAB204026);江西省研究生优质课程和案例建设项目(赣教研字[2021]17号);大学生创新创业训练计划项目(DC2023-010)。

摘　　要：为了探究高温铜渣风淬造粒的可行性和分析液体黏度对风淬造粒效果的影响,搭建了风淬造粒实验台,对水、机油和液态石蜡的风淬造粒效果进行对比,得出随着液体黏度的升高,液滴形状更加接近球形且尺寸分布更加均匀;冷凝后的石蜡颗粒粒径分布较窄,有利于对高温颗粒进行二次余热回收。使用流体体积函数模型(VOF)和凝固熔化模型和辐射模型(DO)对单个铜渣液滴的冷凝过程进行了数值模拟。结果表明,初始温度为1355 K,直径为2 mm的铜渣液滴被300 K室温空气冷却时,液滴表面能够快速凝固形成坯壳,经过1.62 s后铜渣液滴完全凝固。冷却过程中迎风面冷却速度较快而背风面较慢,导致液滴凝固不均匀。气流速度越大,对铜渣液滴的冷却能力越强,液滴的冷凝越快;液滴初始粒径越小,换热效率越高,凝固时间越短。In order to explore the feasibility of air-quenching high-temperature copper slag and investigate the influence of liquid viscosity on granulation,an experimental device was built to compare the granulation effectiveness of water,machine oil and liquid wax.The results show that the shape of liquid drops is closer to the sphere,and size distribution is more uniform with increasing liquid viscosity.Solidified wax granular has a narrow size distribution,which is beneficial for secondary the recovery of waste heat.Simulation of cooling and solidification of a single high-temperature copper slag droplet was carried out by using fluid volume function models(VOF),solidification melting model and radiation model(DO).The results indicate that the copper slag droplet with a diameter of 2 mm and temperature of 1355 K can form a shell quickly and solidify completely after 1.62 s when cooled by air at room temperature of 300 K.The cooling rate at the windward side of the droplet is higher than the leeward side during the cooling process,which will result in uneven solidification.High-velocity airflow has a stronger cooling ability,which can lead to a faster solidification rate of the droplet.Heat transfer efficiency will be higher,and solidification time will be shortened with a decrease in initial droplet size.

关 键 词：铜渣 风淬造粒 数值模拟 余热回收 凝固融化 

分 类 号：TF09[冶金工程—冶金物理化学] X756[环境科学与工程—环境工程]