板坯连铸结晶器内钢液过热消除过程的数值模拟

金属学报

2009, Vol. 45

Issue (4): 476-484

论文

本期目录 | 过刊浏览

板坯连铸结晶器内钢液过热消除过程的数值模拟

于海岐;朱苗勇

东北大学材料与冶金学院; 沈阳 110004

NUMERICAL SIMULATION OF LIQUID STEEL SUPERHEAT REMOVAL IN SLAB CONTINUOUS CASTING MOLD

YU Haiqi; ZHU Miaoyong

School of Materials and Metallurgy; Northeastern University; Shenyang 110004

引用本文:

于海岐朱苗勇. 板坯连铸结晶器内钢液过热消除过程的数值模拟[J]. 金属学报, 2009, 45(4): 476-484.
, . NUMERICAL SIMULATION OF LIQUID STEEL SUPERHEAT REMOVAL IN SLAB CONTINUOUS CASTING MOLD[J]. Acta Metall Sin, 2009, 45(4): 476-484.

全文: PDF(5645 KB)

摘要:

利用数值模拟方法研究了连铸结晶器内钢液的三维温度分布和传热, 分析了水口浸入深度、水口侧孔倾角、结晶器宽度、拉速、钢液过热度、吹Ar、电磁制动及吹Ar量和电流强度等对结晶器内过热钢液的温度分布和传热的影响. 结果表明, 凝固坯壳前沿的最大热量传入处出现在结晶器窄面的钢液冲击点附近, 钢液的大部分过热耗散发生在这一区域附近; 过热钢液传递到凝固坯壳表面的热流量与拉速和过热度的增加成正比; 吹Ar导致结晶器窄面冲击区域和宽面上部区域的热流密度增加; 电磁制动有利于提高结晶器上部区域的温度, 但对热流密度分布没有明显影响; 吹Ar和电磁制动的双重作用使结晶器上部区域的宽面热流密度提高, 冲击区域的热流密度分布没有明显变化.

关键词 ：板坯结晶器, 温度, 传热, 吹Ar, 电磁制动, 数值模拟

Abstract：

Mathematical model was developed to study the 3D temperature distribution and heat transfer from superheated liquid steel to the inside of the solidifying shell in the slab continuous casting mold. The effects of some factors, such as submergence depth and port angle of submerged entry nozzle (SEN), mold width, casting speed, superheat temperature, argon gas injection, electromagnetic brake (EMBr) and also including the argon gas flow rate and current intensity etc., on the temperature distribution and heat transfer of superheated liquid steel in the mold were analyzed. The results indicate that the maximum heat input to the solidifying shell forefront occurs near the impingement point of liquid steel on the narrow face of mold, and the most superheat of superheated liquid steel is dissipated near the impingement zone. Heat flux of superheated liquid steel delivered to the shell surface increases in direct proportion to the casting speed and superheat temperature, respectively. Argon gas injection leads to a substantial increase in superheat flux to the impingement zone of narrow face and the upper region of wide face. EMBr is beneficial in increasing the temperature of upper region of the mold, but has no obvious effect on the heat flux distribution. The double action of argon gas injection and EMBr also produces an increase in heat flux to the upper region of wide face, which has no visible influence for the hat flux distribution of impingement zone.

Key words： slab mold temperature heat transfer argon gas injection electromagnetic brake numerical simulation

收稿日期: 2008-07-30

ZTFLH:

TF777.1

基金资助:

国家自然科学基金委员会和宝钢集团公司“钢铁联合研究基金”项目50674020以及新世纪优秀人才支持计划项目NCET--04--0285资助

作者简介: 于海岐, 男, 1980年生, 博士生

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