电磁场对板坯连铸中间包内钢液流动和传热的影响
|
摘要
通道式电磁感应加热中间包是利用电磁场热效应和力效应开发的,其目的是实现低过热度恒温浇铸并促进钢液中非金属夹杂物去除。研究建立了通道式板坯连铸电磁感应加热中间包的三维数学模型,考察了当前工艺条件,在有无电磁场作用下,板坯连铸中间包内的流动和传热情况。结果表明,通道式板坯连铸电磁感应加热中间包通道内的钢液在电磁场作用下,受到了指向通道中心的偏心电磁力,电磁力呈现近壁面区域大,中心区域小的分布,该偏心电磁力会对流经通道内的钢液产生向心的旋转作用。电磁场对钢液产生的焦耳热主要分布于两个通道的后半部分,在加热145 s后,通道内钢液的温度升高了31.8 K。
Channel type induction heating tundishis developed by utilizing the thermal effect and force effect of electromagnetic field. Its purpose is to achieve low superheat and constant temperature pouring and thus promoting the removal of non-metallic inclusions in molten steel. In this study, a three-dimensional mathematical model of electromagnetic induction heating tundish for channel slab continuous casting was carried out.The molten steel flow and heat transfer in slab continuous casting tundish with or without electromagnetic field were investigated under current technological conditions. The results show that the molten steel in the channels of the slab continuous casting tundish is subjected to eccentric electromagnetic force pointing to the center of the tundish under the action of electromagnetic field. The distribution of electromagnetic force is larger near the wall and smaller in the center. The eccentric electromagnetic force causes the centripetal rotational flow of molten steel in the channel. Joule heat generated by electromagnetic field mainly distributes in the latter half of the two channels. After 145 seconds of heating, the temperature of molten steel in the channels increases by 31.8 K.
Channel type induction heating tundishis developed by utilizing the thermal effect and force effect of electromagnetic field. Its purpose is to achieve low superheat and constant temperature pouring and thus promoting the removal of non-metallic inclusions in molten steel. In this study, a three-dimensional mathematical model of electromagnetic induction heating tundish for channel slab continuous casting was carried out.The molten steel flow and heat transfer in slab continuous casting tundish with or without electromagnetic field were investigated under current technological conditions. The results show that the molten steel in the channels of the slab continuous casting tundish is subjected to eccentric electromagnetic force pointing to the center of the tundish under the action of electromagnetic field. The distribution of electromagnetic force is larger near the wall and smaller in the center. The eccentric electromagnetic force causes the centripetal rotational flow of molten steel in the channel. Joule heat generated by electromagnetic field mainly distributes in the latter half of the two channels. After 145 seconds of heating, the temperature of molten steel in the channels increases by 31.8 K.
引文
[1] ZHANG L F, WANG S Q, DONG A P, et al. Application of electromagnetic (EM) separation technology to metal refining processes: a review [J]. Metallurgical and Materials Transactions B, 2014, 45(6):2153-2185.
[2] 毛斌, 李爱武, 马志民, 等. 连铸中间包八字型通道感应加热与精炼技术的研发及应用[J].炼钢, 2015, 31(1):1-6.
[3] NAKATO H,NOZAKI T,HABU Y,et al. Tundish heating system for the continuous casting of steel[J]. ISIJ International,1986,26(8):758-758.
[4] 二川哲雄,柏倉義光,佐藤雄司ウ. タンディッシュ内溶鋼加熱装置の開発[J]. 鉄と鋼,1987,73(12):192.
[5] SUZUKI I,NOGUCHI S,KASHIWAKURA Y,et al. Development of tundish induction heater for high quality continuously cast blooms[C]//Steelmaking Proceedings,1988,71:125-131.
[6] NAKATA H. Prodoctivity improvement of the bloom CC in Chita plant[C]//Proceeding of the Sixth International Iron and Steel Congress,1990:470-477.
[7] 叶枫,姚海英,肖红,等. 中间罐感应加热在特钢连铸上的应用及其关键技术[C]//2015连铸装备的技术创新和精细化生产技术交流会会议论文集, 2015:83-90.
[8] 马志民,李爱武. 中间包八字型通道感应加热与精炼技术在特钢连铸上的应用[C]//2014年全国炼钢-连铸生产技术会论文集. 唐山,2014:520-523.
[9] 赵沛,王新江,王林英. 连铸中间包钢液加热方式的模拟[J].北京科技大学学报, 1994,16(1):6-9.
[10] 张广庆,金山同. 隧道式感应加热中间罐夹杂物去除及温度分布水模型研究[J].连铸,1998(2):3-7.
[11] WANG Q, QI F S, LI B K, et al. Behavior of non-metallic inclusions in a continuous casting tundish with channel type induction heating[J]. ISIJ International, 2014, 54(12):2796-2805.
[12] YUE Q, ZHANG C B, PEI X H. Magnetohydrodynamic flows and heat transfer in a twin-channel induction heating tundish[J]. Ironmaking & Steelmaking, 2017, 44(3):227-236.
[13] YANG B, LEI H, BI Q, et al. Fluid flow and heat transfer in a tundish with channel type induction heating[J].Steel Research International,2018.DOI:10.1002/srin.201800173.
[14] XING F, ZHENG S, ZHU M. Motion and removal of inclusions in new induction heating tundish[J]. Steel Research International,2018.DOI:10.1002/srin.201700542.
[15] YANG B, LEI H, BI Q, et al. Electromagnetic conditions in a tundish with channel type induction heating[J].Steel Research International,2018.DOI:10.1002/srin.201800145.
[2] 毛斌, 李爱武, 马志民, 等. 连铸中间包八字型通道感应加热与精炼技术的研发及应用[J].炼钢, 2015, 31(1):1-6.
[3] NAKATO H,NOZAKI T,HABU Y,et al. Tundish heating system for the continuous casting of steel[J]. ISIJ International,1986,26(8):758-758.
[4] 二川哲雄,柏倉義光,佐藤雄司ウ. タンディッシュ内溶鋼加熱装置の開発[J]. 鉄と鋼,1987,73(12):192.
[5] SUZUKI I,NOGUCHI S,KASHIWAKURA Y,et al. Development of tundish induction heater for high quality continuously cast blooms[C]//Steelmaking Proceedings,1988,71:125-131.
[6] NAKATA H. Prodoctivity improvement of the bloom CC in Chita plant[C]//Proceeding of the Sixth International Iron and Steel Congress,1990:470-477.
[7] 叶枫,姚海英,肖红,等. 中间罐感应加热在特钢连铸上的应用及其关键技术[C]//2015连铸装备的技术创新和精细化生产技术交流会会议论文集, 2015:83-90.
[8] 马志民,李爱武. 中间包八字型通道感应加热与精炼技术在特钢连铸上的应用[C]//2014年全国炼钢-连铸生产技术会论文集. 唐山,2014:520-523.
[9] 赵沛,王新江,王林英. 连铸中间包钢液加热方式的模拟[J].北京科技大学学报, 1994,16(1):6-9.
[10] 张广庆,金山同. 隧道式感应加热中间罐夹杂物去除及温度分布水模型研究[J].连铸,1998(2):3-7.
[11] WANG Q, QI F S, LI B K, et al. Behavior of non-metallic inclusions in a continuous casting tundish with channel type induction heating[J]. ISIJ International, 2014, 54(12):2796-2805.
[12] YUE Q, ZHANG C B, PEI X H. Magnetohydrodynamic flows and heat transfer in a twin-channel induction heating tundish[J]. Ironmaking & Steelmaking, 2017, 44(3):227-236.
[13] YANG B, LEI H, BI Q, et al. Fluid flow and heat transfer in a tundish with channel type induction heating[J].Steel Research International,2018.DOI:10.1002/srin.201800173.
[14] XING F, ZHENG S, ZHU M. Motion and removal of inclusions in new induction heating tundish[J]. Steel Research International,2018.DOI:10.1002/srin.201700542.
[15] YANG B, LEI H, BI Q, et al. Electromagnetic conditions in a tundish with channel type induction heating[J].Steel Research International,2018.DOI:10.1002/srin.201800145.