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| Influence of swirl nozzle on fluid flow behavior and inclusion removal in large round billet mold |
| ZHANG Zhixiao1, HAN Leilei2, LI Xianglong1, ZHANG Pei2, QU Tianpeng1, WANG Deyong1 |
1. Shagang School of Iron and Steel, Soochow University, Jiangsu 215137, Suzhou, China;
2. Steelmaking Technique Center, Shandong Iron and Steel Group Company Limited, Jinan 271104, Shandong, China |
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Abstract Round billets are widely used in the fields of wind power generation, petrochemical industry and machinery manufacturing. However, the problem of inclusions is the bottleneck of continuous casting of large round billets, which restricts the further improvement of the quality of large round billets. In order to improve the removal rate of inclusions, a three-hole swirl nozzle was proposed. Based on the large eddy simulation method, a three-dimensional transient mathematical model of the round billet mold was established, and the VOF method was used to describe the fluctuation of the slag-gold interface. The influence of the nozzle structure on the flow field of the crystallizer was studied. The research results show that when the swirl nozzle is used, there are many vortices of different scales in the upper part of the mold, the flow field distribution is relatively uniform, the fluctuation at the slag-gold interface is stable, and the speed is about 0.1 m/s. However, when the straight nozzle is used, the velocity of the flow field in the upper part of the mold is very small, and the fluctuation of the slag-gold interface is basically stagnant, which is not conducive to slag removal. In addition, due to the deep jet depth of the straight-through nozzle, the inclusions are not easy to float, and the inclusion removal rate is only 2.05%. The jet depth of the swirl nozzle is shallow, and the annular flow formed in the molten steel can effectively promote the inclusions to float up to the slag-gold interface, so the inclusion removal rate is high, reaching 10.52%. In summary, the three-hole swirl nozzle improves the flow state of molten steel, activates the slag-gold interface, and is beneficial to purifying molten steel, which has certain reference significance for the production of large round billets.
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Received: 25 November 2022
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| [1] |
张洪才,印传磊,郑力宁,等.浸入式水口结构对连铸大圆坯质量的影响[J].中国冶金,2022,32(9):57.
|
| [2] |
刘文祥,任磊.浸入式水口倾角对宽幅连铸结晶器内流动行为的影响[J].钢铁,2022,57(1):83.
|
| [3] |
HUGO A G, CARLOS A E, GERARDO B C, et al. Behavior and removal of Inclusions by means of the use of mathematical and physical simulations as well as the measured vibrations with an accelerometer in a funnel mold in thin slab continuous casting[J]. ISIJ International,2015,55(5):1017.
|
| [4] |
熊宵,邓小璇,王新华,等.水口出口形状对高拉速板坯连铸结晶器内流场特征的影响[J].钢铁研究学报,2014,26(7):35.
|
| [5] |
金业磊. 圆坯结晶器水口优化的模拟研究[D].武汉:武汉科技大学,2016.
|
| [6] |
CHEN J, SU Z J, LI D G,et al. Flow behavior in the slab mold under optimized swirling technology in submerged entry nozzle[J]. ISIJ International,2018,58(7):1242.
|
| [7] |
石红燕,吴春雷,刘利,等.电磁旋流水口对圆坯结晶器液面波动的控制[J].连铸,2021(6):24.
|
| [8] |
潘鹏,侯栋,戈文英,等.连铸坯凝固末端电磁搅拌位置及连铸工艺优化[J].连铸,2022(2):66.
|
| [9] |
吴光辉,唐海燕,程鹏飞,等.浸入式水口结构对180 mm×240 mm断面连铸结晶器内钢液流动行为的影响[J].炼钢,2017,33(4):31.
|
| [10] |
张静,马靓,吴会平.水口结构对连铸中低碳钢流场和温度场的影响[J].钢铁,2019,54(8):116.
|
| [11] |
张静,赵登飞,吴会平. 结晶器电磁搅拌对连铸GCr15钢温度场分布的影响[C]//第十一届中国钢铁年会论文集.北京:中国金属学会,2017:698.
|
| [12] |
王超,张慧,马忠伟,等.圆坯结晶器水口优化的模拟研究[J]. 钢铁研究学报,2014,26(3):15.
|
| [13] |
HUANG C D, ZHOU H C, ZHANG L F, et al. Effect of casting parameters on the flow pattern in a steel continuous casting slab mold: Numerical simulation and industrial trials[J]. Steel Research International,2021,93(2):93.
|
| [14] |
薛瑞,张燕超,张彩军,等.160 mm×160 mm小方坯连铸结晶器内流场数值模拟[J].中国冶金,2020,30(1):51.
|
| [15] |
陈威,张立峰.板坯连铸结晶器内夹杂物分布的大涡模拟[J].中国冶金,2018,28(增刊1):26.
|
| [16] |
LI X L, LI B K, LIU Z Q, et al. Large eddy simulation of electromagnetic three-phase flow in a round bloom considering solidified shell[J]. Steel Research International,2019,90(4):693.
|
| [17] |
SCHURMANN D, GLAVINIĆI, WILLERS B, et al. Impact of the electromagnetic brake position on the flow structure in a slab continuous casting mold: An experimental parameter study[J]. Metallurgical and Materials Transactions B, 2020, 51(1):61.
|
| [18] |
熊洪进,阴树标,马忠存,等.圆坯连铸机电磁搅拌磁场特性研究[J].连铸,2015(1):36.
|
| [19] |
赵菲,白明华,徐宽,等.电磁搅拌作用下弧形结晶器流场的数值模拟[J].连铸,2017(1):13.
|
| [20] |
XIE Q H, NI P Y, ERSSON M, et al. Numerical simulations on dynamic behavior of multiphase flow and heat transfer in a round mold with a swirling flow tundish design[J]. Metallurgical and Materials Transactions B, 2022, 53(5):3197.
|
| [21] |
王璞,李少翔,陈列,等.电磁搅拌对大圆坯结晶器冶金行为影响的探讨[J].钢铁,2019, 54(8):82.
|
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2023, Vol. 42 
