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为提高在低碳范围内的真空脱碳速度,进行了基本原理试验。试验结果表明,扩大界面面积显然比增大总传质系数更有效。而扩大界面面积的最适用的方法之一是吹氩到钢液中。在150kg VIF(Vacuum Induction Furnace——真空感应炉)中试验研究了吹氩对脱碳速度的影响。结果表明,吹氩对提高脱碳速度是有效的,而且用双孔喷嘴的表观脱碳速度常数比用单孔喷嘴的速度常数大。此后,用水力模型试验研究了吹氩到真空室中的效果。为模拟脱碳速度,测定了CO_2的析出速度。喷嘴安装在真空室侧墙的最低部位。喷嘴数目为1个、8个或16个。同时,还进行了不吹气的试验,以作比较。把气体吹到真空室内对提高CO_2的析出速度是有效的。特别是在一定的气体总流量下,增加喷嘴数日更为有效。最后,进行了工业性试验。喷嘴的布置与水力模型中使用8个喷嘴时的情况相同。为使钢液循环而喷入插入管的气体流量为2500N1/min,吹入真空室内的气体流量为800Nl/min,喷嘴内径为2mm。结果表明,在10min内,可以将碳含量从200ppm降至10ppm。同时,计算出吹氩时的脱碳反应界面面积比不吹氩时脱碳反应界面面积大1.6倍。
In order to increase the rate of vacuum decarburization in the low-carbon range, a basic principle test was carried out. The experimental results show that it is obviously more effective to enlarge the interface area than to increase the total mass transfer coefficient. One of the most suitable ways to expand the interface area is to blow argon into the molten steel. The effect of argon blowing on the decarburization rate was experimentally investigated in a 150 kg VIF (Vacuum Induction Furnace). The results show that argon blowing is effective in increasing the decarburization rate, and the apparent decarburization rate constant of a two-hole nozzle is larger than that of a single-hole nozzle. Thereafter, the effect of argon blowing into the vacuum chamber was investigated using a hydraulic model test. In order to simulate the decarburization rate, the precipitation rate of CO 2 was measured. The nozzle is mounted on the lowest part of the sidewall of the vacuum chamber. The number of nozzles is 1, 8 or 16. In the meantime, a non-air-blowing test was also conducted for comparison. Blowing gas into the vacuum chamber is effective in increasing the rate of CO 2 evolution. Especially in a certain total gas flow, increase the number of nozzles more effective days. Finally, an industrial test was conducted. The arrangement of the nozzles is the same as when using 8 nozzles in the hydraulic model. In order to circulate the molten steel into the insertion tube gas flow 2500N1 / min, blowing into the vacuum chamber gas flow 800Nl / min, the nozzle diameter of 2mm. The results show that the carbon content can be reduced from 200 ppm to 10 ppm in 10 min. At the same time, the area of decarburization reaction interface when blowing argon is calculated to be 1.6 times larger than the area of decarburization reaction interface without blowing argon.