Control on vortex critical height during a ladle teeming
HU Qun1, TANG Hai-yan1, LI Xiao-song1, ZHANG Jia-quan1, BAO Wei-feng2, JIANG Xian-xun3
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Steelmaking Plant, Jilin Jianlong Iron and Steel Co., Ltd., Jilin 132000, Jilin, China; 3. Product Development Division, Jilin Jianlong Iron and Steel Co., Ltd., Jilin 132000,Jilin,China
Abstract：To control the critical height of the sink vortex during the ladle teeming, a 1∶3 water model has been established for a 150 t industrial ladle to study the effects of the ladle initial liquid level, residence time, nozzle location and structure, and anti-vortex device on the formation and evolution of the vortex based on the similarity principle. The results show that the residence time of the ladle and the location of the nozzle will exert an important influence on the vortex formation rather than the initial liquid level. With the increase of the residence time, the starting height of the sink vortex gradually increases, while the critical penetration height first increases and then decreases; the vortex critical height gradually decreases with the increasing nozzle eccentricity. By comparing the nozzle types, it is found that the trapezoidal nozzle and square nozzle can reduce the critical height of the vortex by a small amount. A cylindrical anti-vortex device is proposed, and the critical penetration height of the vortex has been reduced by 78.2% with it. The industrial practice shows that the vortex occurrence rate at high casting speed (1.4-1.6 m/min) can be reduced from 8.6%-12% to 1.96% by using this device.
胡群, 唐海燕, 李小松, 张家泉, 包伟峰, 蒋宪勋. 钢包浇注过程中旋涡临界高度控制[J]. 钢铁, 2021, 56(6): 35-41.
HU Qun, TANG Hai-yan, LI Xiao-song, ZHANG Jia-quan, BAO Wei-feng, JIANG Xian-xun. Control on vortex critical height during a ladle teeming[J]. Iron and Steel, 2021, 56(6): 35-41.
[1] 黄晔, 叶树峰, 陶玉平, 等. 渣层厚度和出流口形状对汇流旋涡下渣的影响[J]. 钢铁研究学报, 1995, 7(6): 9.(HUANG Ye, YE Shu-feng, TAO Yu-ping, et al. Influence of slag thickness and outlet shape on the vortex sink carrying slag[J]. Journal of Iron and Steel Research, 1995, 7(6): 9.) [2] Sucker D, Reinecke J, Hage-Jewainski H. Flow investigations for melting metallurgical processes[J]. Stahl Eisen, 1985, 105(14): 765 [3] Morales R D, Davila-Maldonado O, Calderon I, et al. Physical and mathematical models of vortex flows during the last stages of steel draining operation from a ladle[J]. ISIJ International, 2013, 53(5): 782. [4] 叶树峰, 谢裕生, 黄晔, 等. 反应器中出流口的大小和形状对漩涡临界高度的影响[J]. 炼钢, 1999, 15(5): 55.(YE Shu-feng, XIE Yu-sheng, HUANG Ye, et al. Influence of the area and shape of outlet on the critical height of vortex sink[J]. Steelmaking, 1999, 15(5): 55.) [5] 黄含哲, 唐萍, 蒋有洪, 等. 钢包浇铸末期旋涡高度控制物理模拟研究[J]. 炼钢, 2018, 34(4): 17.(HUANG Han-zhe, TANG Ping, JIANG You-hong, et al. Study on control of height of the vortex during ladle final teeming by physical model[J]. Steelmaking, 2018, 34(4): 17.) [6] 王谦, 何生平, 何宇明, 等. 减少钢包下渣提高铸坯洁净度[J]. 钢铁, 2007, 42(10): 32.(WANG Qian, HE Sheng-ping, HE Yu-ming, et al. Improvement in cleanness of continuously cast slab by decreasing slag carry over[J]. Iron and Steel, 2007, 42(10): 32.) [7] 连文敬. 连铸钢包下渣检测技术的发展[J]. 中国冶金, 2011, 21(8): 8.(LIAN Wen-jing. Development of the ladle slag carry over detection technology in continuous casting[J]. China Metallurgy, 2011, 21(8): 8.) [8] 冯巍, 屈天鹏, 王德永. 冶金过程旋涡流动行为模拟研究[J]. 连铸, 2019, 44(5): 1.(FENG Wei, QU Tian-peng, WANG De-yong. Modeling of vortex flow during metallurgical process[J]. Continuous Casting, 2019, 44(5): 1.) [9] 孔凡杰, 蒋有洪, 唐萍, 等. 100 t钢包浇铸末期起旋高度及控制物理模拟研究[J]. 连铸, 2020, 45(1): 6.(KONG Fan-jie, JIANG You-hong, TANG Ping, et al. Physical simulation study on the starting height and control of 100 t ladle at the end of casting[J]. Continuous Casting, 2020, 45(1): 6.) [10] Miloh T, Tyvand P A. Nonlinear transient free-surface flow and dip formation due to a point sink[J]. Physics of Fluids, 1993, 5(6): 1368. [11] Koria S C, Kanth U. Model studies of slag carry-over during drainage of metallurgical vessels[J]. Steel research, 1994, 65(1): 8. [12] 蔺瑞, 彦正国, 刘涛, 等. 60 t钢包浇注过程中汇流旋涡形成机理[J]. 过程工程学报, 2010, 10(4): 655.(LIN Rui, YAN Zheng-guo, LIU Tao, et al. Modeling formation mechanism of vortex during steel casting in a 60 t ladle[J]. The Chinese Journal of Process Engineering, 2010, 10(4): 655.) [13] 周俐, 曹成虎, 戴伟, 等. 120 t钢包汇流卷渣的物理模拟[J]. 炼钢, 2012, 28(2): 56.(ZHOU Li, CAO Cheng-hu, DAI Wei, et al. Physical simulation of sink-vortex slag entrainment in 120 t ladle[J]. Steelmaking, 2012, 28(2): 56.) [14] 唐海燕, 梁永昌. 钢包浇注末期汇流旋涡形成机理及影响因素[J]. 金属学报, 2015, 52(5): 519.(TANG Hai-yan, LIANG Yong-chang. Formation mechanism and influence factors of sink vortex during ladle teeming[J]. Acta Metallurgica Sinica, 2015, 52(5): 519.) [15] 梁永昌, 唐海燕, 江涛, 等. 钢包浇铸末期汇流旋涡形成的影响因素研究[J]. 炼钢, 2016, 32(3): 35.(LIANG Yong-chang, TANG Hai-yan, JIANG Tao, et al. Research on influence factors of sink vortex during ladle teeming[J]. Steelmaking, 2016, 32(3): 35.) [16] 屈天鹏, 郭瑞琪, 郝月莹, 等. 连铸钢包浇注过程中旋涡的形成机理[J]. 钢铁研究学报, 2016, 28(8): 22.(QU Tian-peng, GUO Rui-qi, HAO Yue-ying, et al. Mechanism of vortex formation in teeming ladle during continuous casting process[J]. Journal of Iron and Steel Research, 2016, 28(8): 22.) [17] 郑淑国, 朱苗勇. 钢包浇注过程环出钢口吹氩控制下渣新工艺的数学物理模拟[C]//第十一届中国钢铁年会. 北京: 中国金属学会, 2017: 266.(ZHENG Shu-guo, ZHU Miao-yong. Physical and mathematical simulation of the new process with argon injected into ladle around the tapping hole for controlling slag carry-over during ladle teeming process[C]//The 11th CSM Steel Congress. Beijing: The Chinese Society for Metals, 2017: 266.) [18] 李海峰. 自由表面旋涡的机理研究[D]. 上海: 上海大学, 2009.(LI Hai-feng. Study of the Mechanism of the Free Surface Vortex[D]. Shanghai: Shanghai University, 2009.) [19] 蔺瑞. 钢包浇注过程中漩涡下渣的产生及控制[D]. 沈阳: 东北大学, 2012.(LIN Rui. Generation and Controlling of Slag Entrapment Caused by Vortex on Teeming Process in Ladle[D]. Shenyang: Northeastern University, 2012.)
2021, Vol. 56 
