连铸FC结晶器电磁参数的优化

Optimization of Magnetic Parameters in a Continuous Casting FC-Mold

为了优化国内某钢厂FC(Flow Control)结晶器电磁制动参数以适应生产需要,研究了不同电磁参数下的磁场对结晶器内钢液流动形态的影响.结果表明,FC结晶器内最大磁场强度与电流成正比;电流在一定范围内(I<665 A)变化可控制表面流速大小,超过该范围则主要影响钢液表面流速大小的位置分布;流股撞击深度随电流增加而减小,窄面撞击压强在电流为665 A时达到最大值1890 Pa;下部磁场位置变化与表面流速最大值成正比,且比上部磁场位置变化对钢液表面流速的影响更大,钢液表面流速随上衔铁位置变化的最大波动值为0.010 m/s,而随下衔铁位置变化的最大波动值为0.025 m/s;FC结晶器内流场形态是上、下磁场大小及位置共同作用的结果.

In order to optimize the operational parameters of flow control mold （FC-mold）, the effects of magnetic parameters including electric current and location of the two rules on the flow pattern in a continuous casting mold were studied by numerical simulation. The results indicated that higher electric current value resulted in bigger maximum intensity of the magnetic field. When the current was approximately below 665 A, the surface velocity in the mold decreased with the increase of the current. When the current was over 665 A, the maximum surface velocity fluctuated with the increase of the current. The pressure on the narrow face by the jet from the nozzle outport reached the maximum value 1 890 Pa at 665 A. And the impingement depth of the jet decreased with the increase of the current. The maximum meniscus velocity was more affected by the location of lower magnetic field rather than that of upper one. Both intensity and location of the magnetic field had great influence on the flow pattern in the continuous casting strand.