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研究了真空度对钢液脱氮动力学的影响。结果表明 ,真空度为 67Pa及 1 1 0 Pa时 ,脱氮的限制性环节为氮在钢液液相边界层中的传质 ,真空度为 2 0 0 0 Pa时 ,脱氮的限制性环节为氮在气液界面的化学反应。真空下的碳氧反应对脱氮效果有明显的影响 ,当有碳氧反应时 ,钢液脱氮速度常数增大 ,同时钢液内生或外来固态颗粒会作为气泡形核核心 ,加速脱氮过程。
The effect of vacuum degree on the kinetics of the liquid nitrogen denitrification was studied. The results show that when the degree of vacuum is 67 Pa and 110 Pa, the limiting part of denitrification is the mass transfer of nitrogen in the liquid-liquid boundary layer of the molten steel. When the degree of vacuum is 2000 Pa, the limiting part of denitrification For the nitrogen in the gas-liquid interface chemical reaction. The reaction of carbon and oxygen under vacuum has a significant effect on the denitrification effect. When there is a carbon and oxygen reaction, the constant rate of denitrification of the molten steel increases. At the same time, the solid or foreign particles in the molten steel act as the nucleus of bubble nucleation and accelerate the denitrification process.