金属熔池埋入式气–固喷吹冲击的特征规律  

Impact characteristics of submerged gas–solid injection in the manufacturing process of steel

作　　者：魏光升 朱荣[1,2] 田博涵 董凯 杨凌志[3] WEI Guang-sheng;ZHU Rong;TIAN Bo-han;DONG Kai;YANG Ling-zhi(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials,Beijing 100083,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]高端金属材料特种熔炼与制备北京市重点实验室,北京100083 [3]中南大学资源加工与生物工程学院,长沙410083

出　　处：《工程科学学报》2020年第S01期47-53,共7页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51804345);中国博士后科学基金资助项目(2020T130053,2019M660459);中央高校基本科研业务费资助项目(FRF-TP-19-031A1)。

摘　　要：电弧炉炼钢以废钢为基本原料,熔清后磷含量波动大,且受炉型结构限制,反应动力学条件差,深脱磷困难;全废钢冶炼熔清碳含量低,熔池内C–O反应缺乏,气泡产生数量少;且吹氧强化搅拌造成渣中FeO含量高、钢液易过氧化.电弧炉熔池内气–固喷吹冶炼新工艺,通过向熔池内部直接喷射石灰粉或碳粉,有效解决上述问题.本文通过数值模拟和水力学模拟实验研究了金属熔池内埋入式气体喷吹和气–固喷吹的冲击特征规律.熔池内射流水平和竖直冲击深度随气体喷吹流量增加而增加,而当气体喷吹流量一定时,随着喷枪安装角度的增大,熔池内射流竖直冲击深度增加,而水平冲击深度减少.同时发现,粉剂颗粒提高了气体射流的冲击动能,增加了气体射流的冲击穿透深度.Scrap is used as a basic raw material in an electric arc furnace(EAF)steelmaking process.During the process of melting,the phosphorus content fluctuates greatly,which is affected by various parameters such as the furnace structure and poor reaction dynamic conditions.Moreover,dephosphorization is very difficult to achieve.It is known that the carbon content of all melting scraps is low,C–O reaction in the molten pool is not sufficient,and number of bubbles is small;the FeO content in slag is high and molten steel is very easily oxidized by blowing oxygen and effective stirring.This study proposed a new process of submerged gas–solid injection and implemented it in EAF steelmaking,which effectively solved the aforementioned problems by delivering lime powder or carbon powder directly into the molten pool.In this study,the impact characteristics of submerged gas–solid injection in molten bath were investigated using numerical simulations and water model experiments.It is observed that when the gas flow rate was increased,the horizontal and vertical penetration distances were also increased.Meanwhile,when the installed angle of the nozzle was increased,the horizontal penetration distance was also increased,whereas,there was a decrease in vertical penetration distance.Further,the results obtained also show that both the kinetic energy of gas jet and impact penetration depth are increased by the proposed powder injection process.

关 键 词：电弧炉炼钢 埋入式气–固喷吹 冲击特性 数值模拟 水模型实验 

分 类 号：TF743[冶金工程—钢铁冶金]