方坯连铸内外复合冷却流场温度场耦合数值模拟

Numerical Simulation of Continuous Casting Slab in Inner-outer Cooling with Flow Field Coupled with Temperature Field

针对165mm×165mm的Q235方坯连铸,提出了一种钢水内外复合冷却技术,即在"结晶器内设置内冷却器-U型管",起到提高传热效率的目的。采用CFD商用软件Fluent,就内外复合冷却结晶器内钢水在流场温度场耦合作用下的状况进行数值模拟。结果表明,内冷却器可以提高传热效率进而加快连铸坯的凝固速度,并且减少了注流的回流速度,使钢水的流动均匀,从而提高了连铸方坯的品质。

A inner-outer compound cooling method that set a U shape cooling pipe in mould was employed for improving heat transferring efficiency in continuous casting Q2351 slab with 165mm in size. The filling process of liquid steel in mould with inner-outer compound cooling water was simulated by CFD software based on flow field coupling with temperature field. The simulated results show that inner-cooler can promote the solidification speed of continuous casting billet and decrease the flow-back velocity of poured liquid steel as a result of improving heat transferring efficiency,and the flow of liquid steel was homogenized to improve the quality of billet.