板坯电磁加热中间包钢液流动特性和结构优化

电磁加热中间包技术能有效补偿浇注钢液温降,实现恒温和低温浇注。为使电磁加热中间包技术能合理应用于双流板坯连铸,建立了相应的数学模型,研究了感应加热技术对中间包内流动和温度特性的影响。考察了挡墙-挡坝和通道角度等因素对钢液温度场和流动行为的影响。结果表明,通道式感应加热技术不能直接应用于双流板坯连铸,有必要优化中间包结构。电磁加热能显著提高中间包分配室内的钢液温度,但会产生短路流。挡墙-挡坝可有效减少短路流和均匀钢液温度。挡墙-挡坝与水口出口距离为0.5 m时,钢液流动状态较好,温度分布较均匀;增大通道展开角度不适用于双流板坯感应加热中间包。合理的加热功率模式可将浇注温度波动控制在5 K以内。

Steel flow characteristics and structure optimization for slab electromagnetic induction heating tundish

The use of electromagnetic induction heating technology on the tundish can effectively compensate for the temperature drop of the molten steel, realize constant temperature and low temperature pouring. In order to make the electromagnetic induction heating tundish technology suitable for continuous slab casting, a mathematical model for the double-strand slab induction heating tundish was established, and the influence of the induction heating technology on the flow and temperature characteristics in the double-strand slab tundish was studied. The effects of dam structure and channel angle on temperature field and flow behavior of molten steel were investigated. The results show that the channel induction heating technology cannot be directly applied to double-strand slab casting, and it is necessary to optimize the tundish structure. Electromagnetic induction heating can significantly increase the temperature of molten steel in the distribution room of the tundish, but a short-circuit flow will occur. Retaining walls and dam structures are very effective in reducing short-circuit flow and uniformizing the molten steel temperature. When the distance between the dam and the nozzle is 0.5 m, the flow state of the molten steel is the best, and the temperature distribution of molten steel is relatively uniform. From the point of view of the flow behavior of molten steel, adjusting channel expansion angle is not suitable for the double-strand slab induction heating tundish. Through a reasonable heating power mode, the pouring temperature fluctuation can be controlled within 5 K.