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Mika Pylvänäinen Juhani Nissilä Ville-Valtteri Visuri Jouni Laurila Antti H. Niemi Sakari Tuomikoski Timo Paananen Toni Liedes 《国际钢铁研究》2023,94(9):2300072
Hot metal desulfurization is the main process step for removing sulfur in blast furnace-based steelmaking. A desulfurization reagent is pneumatically injected into the hot metal through a submerged lance causing it to vibrate. The aim of this study is to develop a mechanical vibration measurement-based method that can detect changes in the gas-forming properties of the reagent. The detection is performed using Elastic Net regression and eXtreme Gradient Boosting-based classification models the classification performance of which is compared. The lance aging causes changes in its dynamic characteristics, and the disturbing effect of this is removed from the measured data of the lance vibration prior to classification by means of a developed cleaning algorithm. The best classification performance in detecting changes in the gas-forming properties, with an area under the receiver operating characteristic curve of 0.916 and Matthews correlation coefficient of 0.699, is achieved using an Elastic Net regression-based classification model. The results of this work serve as a basis for developing industrial applications in which the effective utilization of the excitation, such as vibrations generated by the gas formation can be utilized for process monitoring and as a soft sensor for predicting the reagent-induced process variance. 相似文献
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K. Wichterle 《国际钢铁研究》2010,81(5):356-361
A theory on the breakup of rising bubbles is developed on the basis of long‐term experiments with bubbles rising in different liquids. The probability of bubble breakup is expressed in terms of half‐life as a dimensionless function of the bubble volume and liquid properties. The results are applied to develop a mathematical model of bubbles rising in a column of high density liquid under a low external pressure. The model predicts that in typical steelmaking equipment the size of bubbles approaching the liquid level depends mostly on the external pressure and it is quite independent of the original size of the bubbles. 相似文献
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通过水模型研究了VD精炼过程的钢渣混卷行为, 定义了钢渣临界半混和临界全混状态, 并对不同底吹气量、真空度、底吹位置下的混合状态进行了研究;分析了临界搅拌功率和流场稳定性对混卷行为的影响.结果表明:在实验条件下, 临界半混和临界全混气量随着真空度的增大而减小;2/3R双孔底吹位置的临界气量大于2/3R+中心孔底吹位置的;并基于导出的真空度与底吹气量拟合公式, 外推出真空度为67 Pa时实际生产过程中的临界气量;VD过程钢包流场特性主要受底吹位置影响, 并进一步影响混卷行为, 在稳定性流场中当钢渣混合达到同一状态时, 搅拌功率几乎是定值. 相似文献
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结合生产实际数据,分析了RH真空脱气工艺过程。如要求[H]≤1.8×10-6,需真空处理9min;当要求[H]≤1.5×10-6时,冬、春季节RH处理时间为≥11min,夏季则为≥12min,秋季应为≥13min;RH脱氮率约为23%,且在脱气超过8min时RH脱氮出现拐点,延长真空处理时间对脱氮影响不大。 相似文献
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威金斯干式煤气柜是广泛应用于冶金工厂的中间储存设备,活塞倾斜度是确保煤气柜安全运行的重要参数。通过对活塞倾斜度在线监测系统的设计,实现了活塞倾斜度的实时跟踪、记录和监测,保障了气柜的安全运行,并提高了现场工厂的自动化作业水平。 相似文献
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炼钢真空脱气系统泄漏的控制 总被引：1，自引：0，他引：1
阐述了炼钢真空脱气系统由于联接环节多,工作环境恶劣等种种原因导致泄漏激境,并指出应从设计、制造、安装调试和投产使用各个环节控制和减少泄漏的产生。 相似文献
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运用Fluent软件,采取多重参考系法(MRF)和标准k-ε紊流模型对搅拌槽在水中产生的流场进行数值模拟,分析了桨叶高度和转速对三维流场的影响,并对其宏观流动特性和时均速度分布进行详细对比分析。结果表明,当上桨叶高度为1 200mm、转速为1 909r/min(200rad/s)时,搅拌效果最佳。 相似文献
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介绍国内外洁净钢生产技术工艺,结合包钢现有生产工艺就开发洁净钢生产技术的可行性进行粗略分析,提出了生产洁净钢所应采取的技术措施。 相似文献
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The inclusion characteristics were studied during vacuum degassing by interrupting the operation at five different times after the start of operation. Slag and steel samples were collected and thereafter assessed with respect to steel and slag composition, total oxygen content, size distribution of inclusions and chemical composition of inclusions. The main conclusion is that the number of inclusions in the different size classes as well as the total oxygen content seem to reach a minimum value after around ten minutes of vacuum degassing. Furthermore, it seems to be a consistent trend that, during vacuum degassing, the top slag influences the inclusion composition. 相似文献
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介绍了高炉软水密闭冷却循环系统的主要设施进行了设计、生产运行等诸多方面的研究,重点阐述了脱气罐和膨胀罐的作用及系统换热设备的设计与使用,提出了有效调试方法。 相似文献
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胡洵璞 《湖南冶金职业技术学院学报》2006,6(4):550-552
总结了衡阳钢管厂40tVD的精炼生产实践和精炼效果,从理论上分析了真空处理时间、氩气搅拌流量、钢中氧和硫的含量等对真空脱气、脱氮的影响.同时分析了真空精炼对钢液脱氧及夹杂物控制的影响.结果表明,衡管40tVD炉精炼具有良好的冶金效果. 相似文献
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