复吹转炉渣金间传质物理模拟及应用

doi:10.13228/j.boyuan.issn0449-749x.20220288

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摘要将200 t复吹转炉按照1：12的比例缩小,用液体石蜡模拟炉渣、水模拟钢水、压缩空气模拟顶吹和底吹气体,在实验室建立模拟复吹转炉吹炼过程熔池渣金间传质的试验模型,在顶吹气体流量为88 m³/h条件下,通过相对集中非对称布置的4、6、8、10、12支底枪吹入不同底吹气体,用苯甲酸作为传输物质,试验测定了复吹转炉熔池渣金间的容量传质系数,考察不同底枪支数和布置以及底吹气体流量对渣金间传质速率的影响,优化复吹转炉底枪布置和底吹气体流量,以增强复吹转炉熔池的搅拌,改善熔池渣金反应动力学条件。研究结果表明,当底吹气体流量为1.14 m³/h时,在4～12支的底枪布置方案中,4、6支底枪布置方案的容量传质系数(分别为1.77×10^-4、1.80×10^-4 L/s)低于8、10、12支底枪布置方案的容量传质系数(分别为2.41×10^-4、2.24×10^-4、2.42×10^-4 L/s);当底吹气体流量为0.57 m³/h时,在8～12支底枪布置方案中,10、12支底枪布置方案的容量传质系数(分别为1.68×10^-4、1.69 ×10^-4 L/s)明显大于8支底枪布置方案的容量传质系数(0.95 ×10^-4 L/s);在底吹气体流量不小于1.14 m³/h后,8、10、12支底枪布置的容量传质系数相差不大,在2.24×10^-4～2.87×10^-4 L/s的范围;在气体流量小于1.14 m³/h时,随着底吹气体流量的增加,渣金间的容量传质系数增加显著,底吹气体流量大于1.14 m³/h后,容量传质系数增加变缓。将12支底枪布置方案应用到实际复吹转炉,整个炉役的平均碳氧积为0.001 96×10^-4,在不同炉龄阶段,终点钢水平均碳氧积为0.001 88×10^-4～0.002 04×10^-4,终点钢水碳氧积小于0.002 5×10^-4的炉次比例达到90.53%。

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	杨晓江
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关键词 ：复吹转炉, 底枪支数和布置, 底吹气体流量, 渣金间传质, 物理模拟, 碳氧积

Abstract：Mass transfer between slag and metal in a 200 t combined blown converter was simulated in a model with 1∶12 geometrical scale. Liquid paraffin was used to simulate slag, water to simulate molten steel, and compressed air to simulate top and bottom gases. Influence of relatively concentrated and asymmetric configurations of 4, 6, 8, 10 and 12 bottom tuyeres and bottom gas flowrates on the mass transfer rate between slag and metal in the converter was investigated with benzoic acid as transport material under the condition of 88 m³/h top gas flowrate in order to optimize configuration of bottom tuyeres, enhance stirring in the combined blown converter bath and improve dynamic conditions of slag and metal reactions. It is known from the investigation that the volumetric mass transfer coefficients (1.77×10^-4 and 1.80×10^-4 L/s, respectively) from cases of 4 and 6 bottom tuyeres at 1.14 m³/h bottom gas flowrate is lower than those (2.41×10^-4, 2.24×10^-4and 2.42×10^-4 L/s, respectively) of the cases of 8, 10 and 12 bottom tuyeres for the configurations of 4-12 bottom tuyeres used in this research. At the bottom gas flowrate of 0.57 m³/h, the volumetric mass transfer coefficients (1.68×10^-4 and 1.69 ×10^-4 L/s, respectively) from the cases of 10 and 12 bottom tuyeres are higher than that (0.95 ×10^-4 L/s) from the case of 8 bottom tuyeres. At bottom gas flowrates higher than 1.14 m³/h, the volumetric mass transfer coefficients from the cases of 8, 10 and 12 tuyeres are not much different, being in the range of 2.24×10^-4-2.87×10^-4 L/s. The volumetric mass transfer coefficients increase greatly with increase in bottom gas flowrate lower than 1.14 m³/h, while at the bottom gas flowrate greater than 1.14 m³/h, the volumetric mass transfer coefficient increases slowly. The average product of carbon and oxygen contents of molten steel at the end point during a whole of campaign was 0.00196×10^-4 with the application of case of 12 bottom tuyeres in an industrial combined blown converter. At different stages of the converter campaign, the average carbon and oxygen product was 0.001 88×10^-4-0.002 04×10^-4. The ratio of the heats with the carbon and oxygen content product being less than 0.002 5×10^-4 reached 90.53%.

Key words： combined blown converter number and configuration of bottom tuyeres bottom gas flowrate mass transfer between slag and metal physical modeling product of carbon and oxygen contents

收稿日期: 2022-04-27

引用本文:

杨晓江, 周泉林, 张全, 孙建月, 钟良才, 李强. 复吹转炉渣金间传质物理模拟及应用[J]. 钢铁, 2022, 57(12): 57-65. YANG Xiao-jiang, ZHOU Quan-lin, ZHANG Quan, SUN Jian-yue, ZHONG Liang-cai, LI Qiang. Physical modeling of mass transfer between slag and metal in combined blown converter and application[J]. Iron and Steel, 2022, 57(12): 57-65.

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[1] 曾加庆,潘贻芳,王立平,等. 对复吹转炉低成本、高效化生产洁净钢水理论与实践的再认识[J].钢铁, 2014, 49(10):1. (ZENG Jia-qing, PAN Yi-fang, WANG Li-ping, et al. Further understanding of theories and practice for low cost and high-efficiency clean steel production by combined blowing converter[J]. Iron and Steel, 2014, 49 (10): 1.)
[2] 杨文远, 李林, 彭小艳, 等. 提高复吹转炉透气砖寿命和冶金效果的新技术[J]. 中国冶金, 2017, 27(12): 14. (YANG Wen-yuan, LI Lin, PENG Xiao-yan, et al. New technology for improving service life of multi hole plug and metallurgical effect for combined blown converter[J]. China Metallurgy, 2017, 27 (12): 14.)
[3] 罗磊, 赵长亮, 陈玉鑫, 等. 300 t复吹转炉冶炼X80管线钢磷含量控制[J]. 钢铁, 2014, 49(9): 49. (LUO Lei, ZHAO Chang-liang, CHEN Yu-xin, et al. Control of phosphorus content for refining pipeline steel X80 in 300t combined blowing converter[J]. Iron and Steel, 2014, 49 (9): 49.)
[4] 杨文远, 崔健, 蒋晓放, 等. 大型转炉复吹技术的研究[J]. 钢铁, 2011, 46(5): 1. (YANG Wen-yuan, CUI Jian, JIANG Xiao-fang, et al. Combined blowing technology of large converter[J]. Iron and Steel, 2011, 46 (5): 1)
[5] 张华书,肖泽强.渣-钢混合状态对冶金速率的影响[J].钢铁,1987,22(9):24.(ZHANG Hua-shu, XIAO Ze-qiang. Influence of slag-steel mixing state on metallurgical rate[J]. Iron and Steel, 1987, 22(9): 24.)
[6] 刘浏,郭征,李正.搅动熔池中的传质过程[J]. 东北大学学报(自然科学版),1998,19(增刊1):85.(LIU Liu, GUO Zheng, LI Zheng. Mass transfer process in stirred bath[J]. Journal of Northeast University(Natural Science), 1998, 19(s1):85.)
[7] 杨春光,李强,邹宗树. 渣-钢界面传质现象的物理模拟[J]. 东北大学学报(自然科学版),2009,30(8):1147.(YANG Chun-guang, LI Qiang, ZOU Zong-shu. Physical simulation of mass transfer phenomena at slag-metal interface[J]. Journal of Northeast University(Natural Science), 2009, 30(8): 1147.)
[8] 吴伟,吴志宏,邹宗树,等. 150 t顶底复吹转炉脱磷工艺参数的研究[J]. 炼钢, 2005,21(2):30. (WU Wei, WU Zhi-hong, ZOU Zong-shu, et al. Study on process parameters of dephosphorization for 150 ton combined blown converter[J]. Steelmaking, 2005, 21(2): 30.)
[9] 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 Xiao-liang. 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.)
[10] 曾加庆,杨利彬,王杰,等. 底吹搅拌对复吹转炉脱磷工艺的作用分析[J].钢铁, 2017,52(6):40. (ZENG Jia-qing, YANG Li-bin, WANG Jie, et al. Effect of bottom blowing stirring on dephosphorization process in combined blowing converter[J]. Iron and Steel, 2017, 52(6): 40.)
[11] 姚同路,曾加庆,王杰,等. 转炉渣钢间传质的冷态模拟试验[J].中国冶金,2017,27(3):12. (YAO Tong-lu, ZENG Jia-qing, WANG Jie, et al. Cold simulation experiment of converter slag-steel mass transfer[J]. China Metallurgy, 2017, 27(3): 12.)
[12] Singh R P, Ghosh D N. Cold model study of mixing and mass transfer in LBE process of steelmaking[J]. ISIJ International, 1990, 30(11): 955.
[13] Ajmani S K, Chatterjee A. Cold model studies of mixing and mass transfer in LD converters at Tata Steel[J]. Ironmaking and Steelmaking, 1996,23(4): 335.
[14] Ajmani S K, Chatterjee A. Cold model studies of mixing and mass transfer in steelmaking vessels[J]. Ironmaking and Steelmaking, 2005,32(6): 515.
[15] Martin M, Rendueles M, Diaz M. Steel-slag mass transfer in steel converter, bottom and top/bottom combined blowing through cold model experiments[J]. Chemical Engineering Research and Design A, 2005, 83(9): 1076.
[16] 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.
[17] 焦兴利,杨利彬,刘浏. 马钢300 t转炉长寿复吹工艺, 钢铁研究学报,2012,24(12): 28. (JIAO Xing-li, YANG Li-bin, LIU Liu. Long campaigns combined blowing steelmaking technique of 300 t converter in Masteel[J]. Journal of Iron and Steel Research, 2012, 24 (12): 28.)
[18] 李勤,王立永,丁立丰,等. 300 t转炉终点碳氧积控制技术研究[J].炼钢,2019,35(5): 10. (LI Qin, WANG Li-yong, DING Li-feng, et al. Study of control technology on end point carbon-oxygen equilibrium at blowing end point of 300t converter[J]. Steelmaking, 2019, 35(5): 10.)
[19] 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 Qiang, HE Ying-li, LIU Zhen-hai. Research and practice of shortening process time of 120 t top and bottom compound blowing converter[J]. Continuous Casting, 2022(3): 83.)
[20] 李向龙, 冯胜强, 张志霄, 等. 连铸坯拉速对结晶器卷渣现象的影响[J]. 连铸, 2022(2): 100. (LI Xiang-long, FENG Sheng-qiang, ZHANG Zhi-xiao, et al. Effect of casting speed on slag entrapment in continuous casting mold[J]. Continuous Casting, 2022 (2): 100.)
[21] 吴伟勤, 董建锋, 魏光升. 150 t钢包底吹氩气物理模拟[J]. 连铸, 2022(1): 45. (WU Wei-qin, DONG Jian-feng, WEI Guang-sheng. Physical simulation of bottom blowing argon in 150 t ladle[J]. Continuous Casting, 2022, 41(1): 45.)
[22] 詹中华,李庆超,阴树标,等.135t LF钢包炉底吹氩混匀时间及临界流量的物理模拟[J].连铸,2018 (1):29.(ZHAN Zhong-hua,LI Qing-chao,YIN Shu-biao,et al. Physical simulation of mixing time and critical flow rate of bottom blowing argon in a 135 t LF ladle[J]. Continuous Casting, 2018 (1):29.)
[23] 曾俊,代开举,薛飞,等.中间包底吹气正交试验数值模拟研究[J].连铸,2017 (4):6.(ZENG Jun, DAI Kai-ju, XUE Fei,et al. Numerical simulation investigation of orthogonal experiment in tundish with bottom gas blowing[J]. Continuous Casting, 2017 (4):6.)
[24] 马志民, 王家辉, 方庆, 等. 通道式感应加热中间包挡墙优化的物理模拟[J]. 连铸, 2022(4): 78. (MA Zhi-min, WANG Jia-hui, FANG Qing, et al. Physical simulation on optimization of baffles in an induction heating tundish[J]. Continuous Casting, 2022 (4): 78.)
[25] 王朝辉, 罗森, 王卫领, 等. 帘线钢82B小方坯电磁搅拌结晶器多场传输行为[J]. 连铸, 2022 (4): 36. (WANG Zhao-hui, LUO Sen, WANG Wei-ling, et al. Multi-physical transport in billet mold of cord steel 82B with electromagnetic stirring[J]. Continuous Casting, 2022 (4): 36.)
[26] 段鹏飞, 杨斌, 邓安元, 等. 板坯电磁加热中间包钢液流动特性和结构优化[J]. 连铸, 2022 (4): 27. (DUAN Peng-fei, YANG Bin, DENG An-yuan, et al. Steel flow characteristics and structure optimization for slab electromagnetic induction heating tundish[J]. Continuous Casting, 2022 (4): 27.)