Cold Model Study on Inclusion Removal from Liquid Steel Using Fine Gas Bubbles
Cold Model Study on Inclusion Removal from Liquid Steel Using Fine Gas Bubbles
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DOI：
10.2355/isijinternational.41.151
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发表时间：
2001-02
影响因子：
1.8
通讯作者：
JungWan Cho;Hae-geon Lee
中科院分区：
文献类型：
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作者：
JungWan Cho;Hae-geon Lee
采用水模型试验研究了在滑动水口下方的水口内注入空气产生的细小气泡去除钢液中夹杂物的效果。水流量在2.0- 3.2m3hr-1范围内变化，相当于带罩喷管出口线速度的1.77- 2.83ms-1。气体与液体流速的比率在0-12体积%的范围内变化。用聚乙烯、聚氯乙烯和ABS颗粒模拟夹杂物。气泡形成的特性随气体入口位置沿着护罩而变化：滑动门越近，气液两相之间的混合越好。这取决于滑动门的开口：开口越小，湍流越多，因此气体和液体的混合越好。相对去除效率与液体流速等变量相当无关，即，线速度、滑动门开度（按面积计高达58%）和夹杂物浓度。然而，这受到润湿性的极大影响，即，夹杂物与液体的接触角：接触角越大，效率越高。结果表明，钢液中夹杂物的润湿性是决定钢液中夹杂物去除效率的主要因素，本文提出的方法是生产纯净钢的有效手段。
A water model study was undertaken to investigate inclusion removal from liquid steel using fine gas bubbles, which were created by injecting air into a shroud nozzle just underneath the slide gate. The water flow rate was varied in the range of 2.0-3.2 m 3 hr -1 which is equivalent to 1.77-2.83 m s -1 of the linear velocity at the exit of the shroud nozzle. The ratio of gas to liquid flow rates was varied in the range of 0-12 % by volume. Polyethylene, PVC and ABS particles were used to imitate the inclusion. The characteristics of the bubble formation varied with the gas inlet position along the shroud: the closer the slide gate, the better the mixing between the gas and liquid phases. This was dependent on the slide gate opening: the smaller the opening, the more turbulence and hence the better mixing of the gas and the liquid. The relative removal efficiency was fairly independent of such variables as liquid flow rate, i.e., linear velocity, the slide gate opening (up to 58 % by area), and inclusion concentration. However, this was greatly affected by the wettability, i.e., contact angle of the inclusion with the liquid: the larger the contact angle, the higher the efficiency. It is concluded that the governing factor which determines the removal efficiency of the inclusion from liquid steel is the wettability of the inclusion with the steel, and the idea proposed in the present study should be an effective means for production of clean steels.