镍闪速熔炼过程数值仿真  

Numerical simulation of nickel flash melting process

作　　者：陈爱良 王子彪 刘瑶 何利华 张希军 刘福林 卢苏君 HWANG Jiann-Yang 孙丰龙 CHEN Ailiang;WANG Zibiao;LIU Yao;HE Lihua;ZHANG Xijun;LIU Fulin;LU Sujun;HUANG Jiann-Yang;SUN Fenglong(School of Metallurgy and Environment,Central South University,Changsha 410083,China;State Key Laboratory of Comprehensive Utilization of Nickel and Cobalt Resources,Jinchang 737100,China;Michigan Technological University,Houghton,MI 49931,USA)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]镍钴资源综合利用国家重点实验室,甘肃金昌737100 [3]Michigan Technological University,Houghton,MI 49931,USA

出　　处：《中南大学学报（自然科学版）》2024年第3期871-881,共11页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2022YFC3902001);国家自然科学基金资助项目(52374363,52004340);甘肃科技重大专项(22ZD6GC018)。

摘　　要：采用数值模拟软件对国内某大型镍厂闪速炉内气相的速度、温度、浓度及不同粒径颗粒的速度和温度分布特性进行研究。研究结果表明:通过COMSOL软件模拟后,喷嘴喷入的混合气流入炉后发生膨胀,在闪速炉内形成涡流,并会向反应塔上部运动发生回流;氧化反应主要发生在离反应塔中心1.2 m区域内,在距塔顶5.59 m处氧化反应基本完成,且氧气未被完全消耗,沉淀池出口氧气体积分数为7.70%;喷嘴下方和反应塔中下部存在局部高温区域,反应塔中上部区域出现低温区域;小粒径混合物料颗粒与大粒径混合物料颗粒相比受气体影响程度较大,达到的最大速度更大,且由于着火点低,温度上升较快,控制混合物料颗粒粒径在60~80μm之间熔炼反应效果较好。Numerical simulation software was used to study the velocity,temperature and concentration of the gas phase in the flash furnace of a large nickel plant in China,as well as the velocity and temperature distribution characteristics of particles of different particle sizes.The results show that after simulation by COMSOL software,the mixed gas stream injected by the nozzle expands after entering the furnace, it forms a vortex in the flash furnace, and moves towards the upper part of the reactor tower and causes backflow. The oxidation reaction mainly occurs in the area of 1.2 m radius from the center of the tower, and the oxidation reaction is basically completed at 5.59 m from the top of the tower. The oxygen is not completely consumed and the oxygen volume fraction at the outlet of the precipitation tank is 7.70%.There is a local high temperature region below the nozzle and in the middle and lower part of the reaction tower, and a low temperature region in the middle and upper part of the reaction tower. The small particle size mixture particles are affected by the gas to a greater extent than the large particle size mixture particles and reach a greater maximum velocity. And due to the low ignition point, the temperature increases faster. The melting reaction is more effective when the mixture particle size is controlled between 60−80 μm.

关 键 词：镍闪速熔炼 数值模拟 分布特性 反应塔 

分 类 号：TF815[冶金工程—有色金属冶金]