Mixing and interface mass transfer characteristics of electric arc furnace melt pool with composite stirring process
ZHANG Fujun1,2, YANG Shufeng1,2, LIU Wei1, SUN Ye1, JIAO Aoteng1, LI Jingshe1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Abstract：The lack of C-O reaction during the entire scrap steel arc furnace smelting process, coupled with the shallow dish shape of the melt pool, low stirring intensity of a single stirring method, and poor reaction kinetics conditions, are one of the main reasons that restrict the efficient smelting of the arc furnace. In order to improve the dynamic conditions in the molten pool during the arc furnace smelting process and improve smelting efficiency, physical simulation methods are used to study the flow field characteristics formed by a single stirring method. Based on this, further exploration was conducted on the mixing and interface mass transfer characteristics of the molten pool under different composite stirring combinations, and the optimal composite stirring method was explored. The research results indicate that the flow field formed by oxygen jet and side blowing is similar, mainly distributed in the upper and middle upper parts of the molten pool, and composite stirring cannot eliminate the weak stirring zone formed by single stirring. The entire molten pool is penetrated by the flow field from bottom blowing, but there are still weak stirring areas far from the center and bottom of the stream. Combined jet stirring the stirring effect can be greatly improved, with an average mixing time of 53-86 s.Adding a side blowing nozzle to the dead zone of jet and bottom blowing composite mixing, the stirring effect of the melt pool can be further strengthened, with an average mixing time of 31-68 s much lower than that of binary stirring. However, the effect of mixing inside the melt pool and the mass transfer at the steel slag interface is the different or even the opposite. Combining metallurgical effects under the “ternary” stirring conditions, the best comprehensive metallurgical effect is performed in groups 1 and 5.
张福君, 杨树峰, 刘威, 孙烨, 焦傲腾, 李京社. 复合搅拌工艺电弧炉熔池混匀与界面传质特性[J]. 钢铁, 2024, 59(2): 85-98.
ZHANG Fujun, YANG Shufeng, LIU Wei, SUN Ye, JIAO Aoteng, LI Jingshe. Mixing and interface mass transfer characteristics of electric arc furnace melt pool with composite stirring process[J]. Iron and Steel, 2024, 59(2): 85-98.
[1] 朱荣,魏光升. 电弧炉炼钢复合吹炼搅拌强度的研究[C]//2016全国炼钢学术会议论文集. 长沙:中国金属学会炼钢分会,2016:26.(ZHU R,WEI G S. Study on the composite blowing stirring intensity in EAF steelmaking process[C]//Proceedings of the 2016 National Steelmaking Conference. Changsha:Steel Making Branch of the Chinese Metal Society,2016:26.) [2] 张福君,杨树峰,李京社,等.“双碳”背景下低碳排炼钢流程选择及关键技术[J]. 工程科学学报,2022,44(9):1483.(ZHANG F J,YANG S F,LI J S,et al. Selection and key technologies of low carbon steelmaking process under the background of "Double Carbon"[J]. Chinese Journal of Engineering,2022,44(9):1483.) [3] 段卫平,杨树峰,李京社,等. 中国现代电弧炉炼钢废钢快速熔化技术进展[J]. 中国冶金,2021,31(9):78.(DUAN W P,YANG S F,LI J S,et al. Development of rapid melting technology for steel scrap in modern electric arc furnace of China[J]. China Metallurgy,2021,31(9):78.) [4] 王柏惠,杨凌志,郭宇峰,等. 电弧炉炼钢成分预报现状与熔池搅拌对其影响[J]. 中国冶金,2017,27(12):1.(WANG B H,YANG L Z,GUO Y F, et al. Present situation composition forecast in EAF steelmaking and influence of molten bath stirring[J]. China Metallurgy,2017, 27(12):1.) [5] 李连福,施丹昭,姜茂发,等. 搅拌部位及强度对底吹电弧炉熔池混合特性的影响[J]. 炼钢,1998,5(5):30.(LI L F,SHI D Z,JIANG M F, et al. Effects of stirring location and energy on mixing characteristics of bath in bottom blowing EAF[J]. Steelmaking,1998,5(5):30.) [6] 王丹,郭志红,霍彦朋,等. 130 t直流电弧炉喷吹过程的优化模拟[J]. 钢铁,2022,57(2):46.(WANG D,GUO Z H,HUO Y P, et al. Optimization simulation of injection process in 130 t DC electric arc furnace[J]. Iron and Steel,2022,57(2):46.) [7] HE C L,ZHU R,DONG K,et al. Modeling of an impinging oxygen jet on molten bath surface in 150 t EAF[J]. Journal of Iron and Steel Research International,2011,18(9):13. [8] 李国丰,朱荣,刘文涛,等.电炉炼钢集束射流氧枪的数值模拟及在通钢的应用[J]. 过程工程学报,2008,8(增刊1):86.(LI G F,ZHU R,LIU W T,et al. Numerical simulation on oxygen stream field of coherent jet oxygen lance and application to tonghua and steel corpration[J]. The Chinese Journal of Process Engineering,2008,8(s1):86.) [9] 刘福海,魏光升,朱荣,等. 电弧炉炼钢集束氧枪射流冲击深度特征规律研究[J]. 工程科学学报,2018,40(增刊1):130.(LIU F H,WEI G S,ZHU R,et al. Study of penetration depth characteristics of coherent jet in EAF steelmaking[J]. Chinese Journal of Engineering,2018,40(s1):130.) [10] LIU F,ZHU R,DONG K,et al. Simulation and application of bottom-blowing in electrical arc furnace steelmaking process[J].ISIJ International,2015,55(11):2365. [11] 魏光升. 电弧炉熔池内气-固喷吹冶炼应用基础研究[D]. 北京:北京科技大学,2018.(WEI G S. The Application Fundamental Research on EAF Steelmaking with Submerged Gas-Solid Injection[D]. Beijng:University of Science and Technology Beijing,2018.) [12] 王学义,朱荣,李国丰,等. 90t电弧炉底吹工艺效果分析[J]. 工业加热,2013,42(2):39.(WANG X Y,ZHU R,LI G F,et al. Process effect analysis of bottom stirring system for 90 t EAF[J]. Industrial Heating,2013,42(2):39.) [13] 马国宏,朱荣,刘润藻, 等. 电弧炉炼钢复合吹炼技术的研究及应用[J]. 中国冶金,2013,23(12):12.(MA G H,ZHU R,LIU R Z,et al. Research and application of electric arc furnace composite blowing technology[J]. China Metallurgy,2013,23(12):12.) [14] 董凯,魏光升,常军,等. 底吹条件下电弧炉炼钢熔池的流体流动特性[J]. 工程科学学报,2018,40(增刊1):93.(DONG K,WEI G S,CHANG J,et al. Fluid flow characteristics of molten bath with bottom-blowing in EAF steelmaking[J]. Chinese Journal of Engineering,2018,40(s1):93.) [15] LAI Z,XIE Z,ZHONG L. Influence of bottom tuyere configuration on bath stirring in a top and bottom combined blown converter[J]. ISIJ International,2008,48(6):793. [16] ZHONG L C,LEI Z L,JI C X,et al. Physical modeling and optimization of bottom tuyere configuration and blowing parameters in a top and bottom combined blowing converter[J]. Developments in Chemical Engineering and Mineral Processing,2006,14(3/4):343. [17] 王书晓,陈学刚,温治. 侧吹炉内气流穿透和搅动行为实验研究[J]. 中国有色冶金,2021,50(6):97.(WANG S X,CHEN X G,WEN Z. Experimental study on gas flow penetration and stirring behavior in side-blowing furnace[J]. China Nonferrous Metallurgy,2021,50(6):97.) [18] LIU Y,YANG T,ZHUO C,et al. Experiment and numerical simulation of two-phase flow in oxygen enriched side-blown furnace[J]. Transactions of Nonferrous Metals Society of China,2020,30(1):249. [19] 钟良才,朱英雄,赖兆奕,等. 顶底侧吹转炉熔池搅拌混匀物理模拟[J]. 东北大学学报(自然科学版),2010,31(6):843.(ZHONG L C,ZHU Y X,LAI Z Y,et al. Physical modeling of stirring and mixing in bath of top-bottom-side blown converter[J]. Journal of Northeastern University(Natural Science),2010,31(6):843.) [20] 钟良才,周小宾,朱英雄,等. 100t顶底侧吹转炉熔池混匀行为[J]. 材料与冶金学报,2011,10(4):241.(ZHONG L C,ZHOU X B, ZHU Y X,et al. Bath mixing behavior in a 100 t top-bottom-side blown converter[J]. Journal of Materials and Metallurgy,2011,10(4):241) [21] 蔡俊,曾加庆,梁强.复吹转炉顶吹枪位与非均衡底吹搅拌的水模拟[J].中国冶金,2019,29(10):26.(CAI J,ZENG J Q,LIANG Q. Water simulation of combined blowing converter for top lance level and non equilibrium bottom blowing stirring[J]. China Metallurgy,20139,29(10):26.) [22] 曾兴富,陈伯瑜,赖兆奕,等. 顶底侧吹转炉炼钢新技术开发研究及初步应用[J]. 炼钢,2010,26(4):12.(ZENG X F,CHEN B Y,LAI Z Y,et al. Development study and application of new steelmaking technology in a top-bottom-side blown converter[J]. Steelmaking,2010,26(4):12.) [23] 富强,赫英利,刘真海.缩短120 t顶底复吹转炉工艺时间的研究与实践[J].连铸,2022(3):83. (FU Q, HE Y L, LIU Z H. Research and practice of shortening process time of 120 t top and bottom compound blowing converter[J]. Continuous Casting, 2022, 41(3): 83.) [24] 陈伯瑜,钟良才,黄标彩,等. 顶底侧吹转炉炼钢新技术工业实验[C]//第七届(2009)中国钢铁年会论文集(上). 北京:中国金属学会,2009:1207.(CHEN B Y,ZHONG L C,HUANG B C,et al. Industrial experiment of new steelmaking technology in top-bottom-side blown converter[C]//Proceedings of the 7th (2009) China Steel Annual Conference (I). Beijing:The Chinese Society for Metals,2009:1207.) [25] 贾凝晰,董凯,马国宏,等. 45t电弧炉埋入式氧枪水模拟研究[J]. 工业加热,2016,45(4):44.(JIA N X,DONG K,MA G H,et al. Water model study of 45 t EAF embedded type oxygen lance[J]. Industrial Heating,2016,45(4):44.) [26] 唐天平,朱荣,魏光升,等. 电弧炉埋入式喷吹熔池搅拌水模拟优化研究[J]. 工业加热,2019,48(1):49.(TANG T P,ZHU R,WEI G S,et al. Simulation and optimization of embedded type oxygen lance in EAF[J]. Industrial Heating,2019,48(1):49.) [27] SINGH V, LENKA S N, AJMANI S K, et al. A novel bottom stirring scheme to improve BOF performance through mixing and mass transfer modelling[J]. ISIJ International,2009,49(12):1889. [28] SINGH R P, GHOSH D N. Cold model study of mixing and mass transfer in LBE process of steel-making[J].ISIJ International,1990,30(11):955. [29] 吴伟,邹宗树,吴志宏,等. 复吹转炉钢-渣间容量传质系数的水-油模型[J]. 特殊钢,2004,25(2):19.(WU W,ZOU Z S,WU Z H,et al. Water-oil model for volumetric mass transfer coefficient between slag and metal in combined blowing converter[J]. Special Steel,2004,25(2):19.) [30] 黄博,孙彦辉,白雪峰,等. 300 t脱磷炉渣-钢界面搅拌与传质效果模拟[J]. 钢铁,2017,52(10):38.(HUANG B,SUN Y H,BAI X F,et al. Simulate on agitating and mass transfer effect of 300 t dephosphorization slag-steel interface[J]. Iron and Steel,2017,52(10):38.) [31] SHARMA S K,HLINKA J W,KERN D W. The bath circulation jet penetration and high-temperature reaction zone in BOF steelmaking [J]. Iron Steelmaker,1977,4(7):7. [32] 刘小亮. 转炉底吹搅拌与渣-钢间传质的冷态模拟[D]. 北京:钢铁研究总院,2017.(LIU X L. Water Model Study of Bottom Blowing Stirring and Mass Transfer between Slag and Steel in Converter[D]. Beijing:Central Iron and Steel Research Institute,2017.)
2024, Vol. 59 
