共查询到17条相似文献,搜索用时 187 毫秒
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敬业钢铁有限公司现场试验了单嘴浸渍管结构RH炉和弓形浸渍管结构RH炉真空精炼超低碳钢的应用效果,记录两种RH炉提升气体流量和真空度的变化,多次取样检测钢液中w([C])和w([Mn]),分析对比两种RH炉的脱碳效果和混匀时间。结果显示,在真空处理6 min内,两种RH炉的真空度都可降至100 Pa以下,10 min后稳定在50 Pa左右;在真空处理20 min内,前者钢中w([C])基本脱至0.001 0%~0.001 5%,而后者钢中w([C])可以脱至0.000 5%左右,后者的脱碳速率也明显快于前者;前者和后者的混匀时间分别在3和1 min左右。结果表明,后者的冶炼效果明显优于前者,弓形浸渍管比单嘴浸渍管更适用于小吨位RH真空精炼炉。 相似文献
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建立了钢厂250 t RH真空精炼装置1/4的水模型,研究浸渍管内径(520~750 mm)、驱动气体流量(1 000~3 000 L/min)、浸渍管浸入深度(525~800 mm)和真空室压力(0~25 kPa)等参数对RH循环流量的影响。结果表明,随驱动气体流量、浸渍管浸入深度增加、浸渍管内径增大以及真空室压力减少,RH钢水循环流量增加;为获得较大流量,浸渍管浸入深度应≥560 mm,真空室液面高度应≥200 mm。得出循环流量的回归方程,通过对钢厂250 t RH设备工艺参数作相应调整后,RH装置的生产效率明显提高。 相似文献
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分析中厚板卷厂RH炉浸渍管使用寿命低的原因,通过优化RH炉浸渍管耐材的理化指标、浸渍管喷补料及喷补工艺,改进顶渣设备及优化烘烤制度等措施的实施,浸渍管平均使用寿命由2007年投产初期的32炉提高到2009年的72炉,RH炉真空钢月生产量由2万吨提高到8.3万吨。 相似文献
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采用物理模拟方法对单管 RH 真空精炼过程流场的循环流动、混合特性等进行了研究,建立与 RH 真空精炼装置原型相似比为1∶5的水模型,研究了不同工艺参数对单管 RH 装置内钢液循环流动的影响。对比实验测量数据发现,增大吹氩量和浸渍管插入深度以及浸渍管有效横截面有利于提高循环流量,减小均混时间;在相同的实验条件下,椭圆形浸渍管 RH 比传统浸渍管 RH 的循环流量要大15%以上,单管 RH 的均混时间比传统RH 可以缩短20%;单管 RH 钢包底部吹氩位置位于距钢包中心0.4R(R 是钢包半径)处时,均混时间最短。 相似文献
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A mathematical model was developed to investigate the effect of snorkel shape on the recirculation rate and the erosion of the lining refractory during RH degassing process. A particle image velocimetry technique was used to measure the velocity distribution in a water modelling experiment. The calculated results were well validated with the measured ones. In the mathematical model, the interfaces between the molten steel and the gas phase, and the motion of argon bubbles were simulated and tracked using VOF?+?DPM model by which the argon bubbles were treated as the discrete phase in the molten steel and the top gas phase, and the top gas phase was treated as a second continuous phase. It was found that the recirculation rate of the molten steel with oval snorkels was significantly larger than that with round snorkels. For round snorkels, the optimum gas flow rate was 1800?L?min?1 and it was 2800?L?min?1 for oval snorkels. Furthermore, the volume distribution of the argon in the radial direction of the up-snorkel with oval snorkels was much more homogeneous than that with round snorkels. Meanwhile, the predicted maximum wall shear stress showed that the bottom and the sidewall of the ladle with round snorkels were more seriously eroded than that with oval snorkels. Therefore, the oval snorkel was beneficial to improve the service life of the RH degasser. 相似文献
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利用CFX数值计算软件建立的数值耦合模型对马钢RH KTB的流场进行了分析,得出了包括钢包、真空室、上升管、下降管的RH全系统的流场状态及其在精炼过程中的变化规律。在RH吹氩气液两相区的处理上,应用了非均相多相流模型。模拟结果表明RH真空室内流场中存在小环流现象。 相似文献
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马钢RH KTB流场的数值模拟 总被引:1,自引:0,他引:1
利用CFX数值计算软件建立的数值耦合模型对马钢RH KTB的流场进行了分析,得出了包括钢包、真空室、上升管、下降管的RH全系统的流场状态及其在精炼过程中的变化规律。在RH吹氩气液两相区的处理上,应用了非均相多相流模型。模拟结果表明RH真空室内流场中存在小环流现象。 相似文献
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A three‐dimensional mathematical model for the molten steel flow during the RH refining process has been applied to the circulatory flow processes in both a practical RH degasser and its water model unit. The model was presented earlier [1] and one of its characteristics is that ladle, snorkels and vacuum vessel are regarded as a whole. Using this model, the fluid flow field and the gas holdups of liquid phases and others have been computed respectively for a 90 t RH degasser and its water model unit with a 1/5 linear scale. The results show that the mathematical model can properly describe the flow pattern of molten steel during the refining process in an RH degasser. Except in the area close to the liquid's free surface and in the zone between the two snorkels in the ladle, a strong mixing of the molten steel occurs, especially in the vacuum vessel. However, there is a boundary layer between the descending liquid stream from the down‐snorkel and its surrounding liquid, which is a typical liquid‐liquid two‐phase flow, and the molten steel in the ladle is not in a perfect mixing state. The lifting gas blown is ascending mostly near the up‐snorkel wall, which is more obvious under the conditions of a practical RH degasser, and the flow pattern of the bubbles and molten steel in the up‐snorkel is closer to an annular flow. The calculated circulation rates for the water model unit at different lifting gas rates are in good agreement with experimentally determined values. 相似文献
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《钢铁冶炼》2013,40(5):427-434
AbstractA three-dimensional mathematical model for molten steel flow in a whole degasser during the RH (Ruhrstahl–Heraeus) refining process is proposed. The model has been developed considering the physical characteristics of the process, particularly the behaviour of gas–liquid two phase flow in the up snorkel and the momentum exchange between the two phases. The fluid flow fields and gas holdups of liquid phases, among other parameters, in a 90 t RH degasser and a water model unit of one-fifth linear scale have been computed using this mathematical model. The results show that the flow pattern of molten steel in a whole RH degasser can be well represented by the mathematical model. Apart from the area close to the free surface and the zone between the two snorkels in the ladle, the molten steel in an RH degasser, especially in the vacuum vessel, is reasonably fully mixed during the refining process. However, there is a boundary layer between the descending liquid stream from the down snorkel and the surrounding liquid, which is typical liquid–liquid two phase flow, and the molten steel in the ladle is not perfectly mixed. The blown lifting gas ascends mostly near the up snorkel wall, which is more obvious under the conditions of an actual RH degasser, and the flow pattern of bubbles and molten steel in the up snorkel is closer to annular flow. Calculated circulation rates for the water model unit at various lifting gas rates are in good agreement with values determined by means of water modelling experiments. 相似文献