铁浴反应器多段侧吹混合特性数值模拟  

Numerical simulation of multi-stage side-blowing mixing characteristics in iron bath reactor

作　　者：何奕波 郭文科 李怡宏 刘光明[1] 崔鑫 Yibo HE;Wenke GUO;Yihong LI;Guangming LIU;Xin CUI(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024

出　　处：《过程工程学报》2021年第12期1430-1439,共10页The Chinese Journal of Process Engineering

基　　金：山西省重点研发计划(编号:201903D121093);山西省高等学校科技创新项目(编号:2019L0633,2019L0616);山西省科技重大专项(编号:20181101002)。

摘　　要：在厚渣层铁浴熔融还原反应器水模实验的基础上,通过数值模拟的方法研究了双层侧枪在不同喷吹角度(40°,45°,50°)和不同水平插入深度(60,120,180 mm)条件下对熔池的搅拌情况的影响,通过水模型实验验证了数值模拟的准确性。通过观察气液两相流中熔池的流场以及示踪剂在熔池中的流动扩散情况,分析弱流区和死区的占比以及不同侧吹条件下的混匀时间,结果表明,侧枪水平插入角度对熔池搅拌的影响较水平插入深度更显著,侧枪的水平插入角度和深度影响熔池中产生的回旋流区域和回旋流个数,当侧枪水平插入角度越大,水平插入深度越深时,熔池中弱流区或死区的体积占比越小,越有利于熔池搅拌混匀。最佳的喷吹条件为上层喷吹角度50°及插入深度60 mm、下层喷吹角度50°及插入深度120 mm。研究了不同气流量对熔池混匀情况的影响,得出上下枪单支气流量分别为8.58和10.43 Nm^(3)/h时,熔池的混匀时间最短。Based on the water model experiment of an iron bath smelting reduction reactor with thick slag layer,numerical simulation is taken out to study the stirring characteristics of the molten bath by double-layer side-blowing lance under different injection angles (40°,45°,50°) and different horizontal insertion depths (60,120,180 mm),and the accuracy of numerical simulation is verified by the results of water model experiment.By observing the flow field of the molten pool in the gas-liquid two-phase flow and the diffusion of the tracer,the proportion of the weak flow zone and the dead zone and the mixing time under different side-blowing conditions are analyzed,the results show that:the horizontal insertion angle of the side-blowing lance has a more significant influence on the stirring characteristics of the molten pool than the horizontal insertion depth.The horizontal injection angle and insertion depth of the side-blowing lance affect the swirling flow area and the number of swirling flows generated in the molten pool.When the horizontal injection angle of the side-blowing lance is larger and the horizontal insertion depth is deeper,the volume of the weak flow zone or the dead zone in the molten pool is smaller,which is more conducive to the stirring and mixing of the molten pool.The best injection conditions are obtained from the numerical simulation:the upper injection angle is 50°,the insertion depth is 60 mm,the lower injection angle is 50°,and the insertion depth is 120 mm.In addition,the mixing time of molten bath under different gas flow rates are also studied.It is obtained that the mixing time of molten bath is the shortest when the single gas flow rates of upper and lower lance are 8.58 and 10.43 Nm^(3)/h,respectively.

关 键 词：铁浴反应器 多段侧吹 数值模拟 气液两相流 混匀时间 

分 类 号：TF557[冶金工程—钢铁冶金]