底吹气中间包内流动与夹杂物控制

Flow Control and Inclusion Removal in Continuous Casting Tundish with Bottom Gas Blowing

以宝钢集团梅山钢厂1台连铸中间包为原型,采用水模型的方法对底吹气中间包内的流动和夹杂物控制进行研究。结果表明,采用自行设计的装置进行底吹气,能够在中间包内形成均匀、稳定而又细小的气泡;底吹气能够在中间包内形成微气泡形式的“气幕挡墙,”“气幕挡墙”的形成能有效地破坏中间包内"层流"结构的流动形式,避免形成短路流动,提高平均停留时间,缩小死区体积分率;在吹气位置的选择上,采用中部位置(B2)进行吹气,效果较好;采用底吹气的方式可以实现对中间包内流动的控制,且不需要大的气体流量;底吹气有利于中间包内夹杂物的去除。

Flow control and inclusion removal in continuous casting tundish with bottom gas blowing has been studied in detail with water model, prototype of which is the one in Meishan Iron and Steel Cooperation. Air is blown into the tundish at the bottom with newly designed air-supply equipment, with which tiny, steady and uniformly distributed bubbles can be produced. Results show that, the ＂gas baffle＂ with tiny gas bubbles can form in tundish, which destroy the laminar-like flow and eliminate the short circuit flow, hence the average residence time has been prolonged and volume fraction of dead zone has been reduced; among the three gas blowing positions, best results can be obtained with gas blowing at position B2; flow control with gas blowing technology can be achieved with a relatiye small amount of gas flow rate; bottom gas blowing in tundish is in favor of inclusion removal.