透气砖对底吹中间包钢液流动特性影响的水力学模拟

Water Modeling of Effect on Steel Liquid Flow in the Bottom Gas Blowing Tundish of Different Porous Materials

采用不同性能参数的多孔透气砖进行中间包底部吹气水模实验,研究透气砖的气孔率、透气度、平均孔径对所形成的气泡大小和能形成有效气幕所需条件的影响,并分析使用不同透气砖时的RTD曲线,对使用不同透气砖时的吹气参数进行了优化。研究结果表明,透气砖的气孔率、透气度越小,形成的气泡越小,能形成有效气幕所要求的吹气量越大。采用中间包底部吹气技术,当控制的吹气参数合理时,可以有效地延长钢液的平均停留时间,降低死区体积;在中间包底部同一位置吹气时,气体通过的透气砖不同,要求的吹气参数不同。

Effect on steel liquid flow in the bottom gas blowing tundish of different porous materials was studied using water modeling. It is found that the parameters of porosity, permeability and average diameter have great influence on bubble size and gas flow rate which can form effective gas curtains. When gas is blowing through different porous materials, the relevant RTD curves are analysed and the gas blowing parameters optimized. The results show that higher gas flow rate is needed to form effective gas curtains and the bubbles are smaller as the porosity and permeability of porous materials are smaller. With bottom gas blowing at the tundish, the average residence time of steel liquid flow in the tundish can be prolonged effectively ; the dead volume fraction can be reduced. Different gas blowing parameters are needed when gas is blowing through different porous materials at the same position of the tundish.