VD過程鋼渣混卷行為的水模型

吳華杰; 蔣芳杰; 李巧琦; 張漓; 張永超

doi:10.13374/j.issn2095-9389.2018.s1.021

VD過程鋼渣混卷行為的水模型

doi: 10.13374/j.issn2095-9389.2018.s1.021

1. 北京科技大學鋼鐵共性技術協同創新中心;
2. 北京科技大學工程技術研究院

基金項目:

國家自然科學基金資助項目 (U1660113)

詳細信息

通訊作者:
吳華杰, E-mail:whjyeah@163.com

中圖分類號: TF769.4
計量
- 文章訪問數: 21
- HTML全文瀏覽量: 6
- PDF下載量: 0
- 被引次數: 0
出版歷程
- 收稿日期: 2018-01-10
- 網絡出版日期: 2023-07-18

Physical modeling on the mixing behavior of molten steel and slag in VD process

1. School of Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing;
2. School of Engineering Research Institute,University of Science and Technology Beijing

摘要

摘要: 通過水模型研究了VD精煉過程的鋼渣混卷行為, 定義了鋼渣臨界半混和臨界全混狀態, 并對不同底吹氣量、真空度、底吹位置下的混合狀態進行了研究;分析了臨界攪拌功率和流場穩定性對混卷行為的影響.結果表明:在實驗條件下, 臨界半混和臨界全混氣量隨著真空度的增大而減小;2/3R雙孔底吹位置的臨界氣量大于2/3R+中心孔底吹位置的;并基于導出的真空度與底吹氣量擬合公式, 外推出真空度為67 Pa時實際生產過程中的臨界氣量;VD過程鋼包流場特性主要受底吹位置影響, 并進一步影響混卷行為, 在穩定性流場中當鋼渣混合達到同一狀態時, 攪拌功率幾乎是定值.
- 真空脫氣 /
- 鋼渣混卷 /
- 攪拌功率 /
- 水模型 /
- 吹氬
Abstract: The mixing behavior of molten steel and slag has an important impact on refining effect in vacuum degassing (VD) process.In the VD refining process, the vacuum condition makes the bottom argon gas agitate the molten steel vigorously, and increase the exposed molten steel area, which not only aggravates the degree of steel slag mixing in the ladle, but also promotes the degassing reaction in molten steel.Moreover, it has an important influence on the desulfurization effect of molten steel.In the actual melting process, the exposed situation of the molten steel can be observed over the slag, but the steel and slag mixing situation in the ladle cannot be observed.Therefore, it has a great practical significance to study the slag mixing behavior in VD refining process under the different process conditions.In the water model experiment, the critical condition of half-mixing and complete-mixing was first defined.And then the impacts of the total blowing flow rate, vacuum degree, and the bottom blowing positions on half-mixing and complete-mixing were discussed.Besides, the effects of critical stirring energy density and stability of flow field on mixing behavior were also analyzed.The results indicate that half-mixing and complete-mixing critical gas flow rate decreases with the increase of vacuum degree in the laboratory condition.And the critical gas flow rate in 2/3R+2/3R is greater than that in 2/3R+center hole.In addition, the fitting formulas of vacuum degree and critical gas flow rate were given.Based on fitting formulas, critical gas flow rate in actual VD process was obtained when vacuum degree was 67 Pa.According to the results, the critical stirring energy density is nearly a constant when the steel-slag mixing reaches the same condition in steady flow field, which indicates that flow character can further influence mixing effect and it is affected by the bottom blowing positions.
- vacuum degassing ladle /
- mixing of molten steel and slag /
- stirring energy density /
- water model /
- argon blowing

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參考文獻(16)

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