(1. 昆明理工大学 省部共建复杂有色金属资源清洁利用国家重点实验室,昆明 650093;
2. 昆明理工大学 冶金与能源工程学院,昆明 650093;
3. 中国瑞林工程技术有限公司,南昌 330002)
摘 要: 为阐明底吹熔池气体射流振荡强化搅拌机制,提出了基于 Betti数来定量表征底吹气体振荡射流强化搅拌效果的新途径,并以此为评价标准提出底吹炉氧枪排布的优化方案。首先,基于正交试验理论,设计了多水平因子水模型实验方案;其次,运用摄像设备捕捉了19 组底吹水模型容器内气液流态演化过程的连续图片,通过图像处理技术得到连续流态图片的Betti数;最后,通过Betti数的分布规律来实现不同工况下气体射流振荡搅拌效果的差异化表征。结果表明:在单排氧枪排布方式下,在 0°~14°范围枪倾角越大,射流产生气泡数量越多,分布更为均匀;在双排氧枪排布方式下,非对称喷吹的射流振荡搅拌效果明显更好,且采用 0°与 7°倾角的特征数值更为理想。
关键字: 底吹熔池;射流振荡;强化搅拌;图像处理;氧枪排布
(1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China;
2. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
3. China Nerin Engineering Co., Ltd., Nanchang 330002, China)
Abstract:In order to clarify the enhanced stirring mechanism of oscillatory gas jet in bottom-blown bath, a new way based on Betti numbers to quantitatively characterize the enhanced stirring effect was proposed. The optimization scheme of oxygen lance arrangement in bottom blowing furnace was confirmed by the evaluation standard of Betti numbers. Firstly, based on the orthogonal experiment theory, the multi-level factor water model experiment was designed. Secondly, the continuous images of the evolution process of the gas-water flow state in 19 sets of water model vessels were captured by camera equipment, and Betti numbers of continuous flow images were obtained by image processing technique. Finally, the differential characterization of the stirring effect of the oscillatory gas jet under different working conditions was realized through the distribution regularities of Betti numbers. The results show that, in the single row oxygen lance arrangement mode, from the range of 0 ° to 14 °, the larger the angle of oxygen lance is, the more bubbles the jet produces, and the bubble distribution is also more uniform. Under the arrangement mode of double row oxygen lance, the stirring effect of oscillatory gas jet with asymmetric injection is obviously better, and the characteristic values of 0 ° and 7 ° inclination angle are more ideal.
Key words: bottom-blowing bath; jet oscillation; reinforce stirring; image processing; lance arrangement