薄板坯连铸结晶器内流动传热行为的研究

基于珠钢CSP薄板坯连铸机设备工艺条件和所采用扁平浸入式水口结构,结合铜板测温导出的热流密度分布进行了漏斗形结晶器内钢水流动、自由液面以及传热凝固等冶金现象的综合描述和数值分析.结晶器熔池中以两个上旋涡为主的钢水循环流动局限在漏斗形结晶器内,上旋涡流股冲击和离开熔池液面分别对液面起伏波动有所贡献,弯月面下距窄边100 mm范围内有二次涡形成.除水口下方两侧存在两个具有明显过热的高温区外,熔池中绝大部分钢水的温度在液相线附近保持恒定,铸坯表面温度分布和坯壳发育过程均反映出水口高温射流的影响,铸坯表面最高温区位于熔池液面下方靠近结晶器窄边的地方.

Numerical Simulation on Fluid Flow and Heat Transfer Behaviors in Mould of CSP Thin Slab Caster

For CSP thin slab caster at Zhujiang Steel, a comprehensive mathematical simulation concerning fluid flow, fluctuation of bath surface, heat transfer and solidification of melt was performed with given SEN and meas ured heat fluxes. It was found that the circulation of liquid steel, in which two upper-vortexes occupy most space, is totally localized in the funnel part of mold. The fluctuation of bath surface is caused by up vortex streams impinging on surface and deviating from the surface, and secondary vortexes exist below meniscus 100 mm off mold narrow faces. Except that there is obvious superheat at lower sides of SEN, the temperature of liquid steel in mold is around the liquidus, and the surface temperature of slab and growth of solidifying shell are affected by streams from SEN, and the hottest zone on slab surface is below meniscus near mold narrow faces.