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Water modeling of molten steel flow in a multi-strand tundish with gas blowing

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 143-148页

作者： Jing Jiang Jing-she Li Hua-jie Wu Shu-feng Yang Tao Li Hai-yan Tang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Engineering Research Institute University of Science and Technology Beijing Beijing 100083 China

Fluid flow characteristics in a four-strand tundish with gas blowing were studied by water modeling *** is found that gas blowing can greatly improve the flow characteristics in the tundish with a turbulence *** dramatically increases the peak concentration time,and greatly decreases the dead volume,and reduces the minimum residence *** gas blowing location,gas flow rate,and porous plug area greatly influence the flow characteristics in the tundish; the gas blowing location near the baffle,smaller gas flow rate,and smaller porous plug area are better for improving the fluid flow *** gas blowing can reduce the difference of flows at the middle outlets and side outlets for the multi-strand *** produced by gas blowing can absorb small inclusions and provide the condition for inclusion collision and ***,introducing gas blowing into a tundish and combining the turbulence inhibitor can improve inclusion floating and removal,and the cleanness of molten steel can be advanced.

关键词： continuous casting tundish water modeling gas blowing porous plug

Effect of gas blowing on the head of thermal ablation vehicle

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Advances in Aerodynamics 2022年第1期4卷 188-202页

作者： Qing Li Xianxu Yuan Jianqiang Chen Lin Bi State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang621000China Computational Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang621000China

The reentry vehicle will encounter thermal ablation,especially at the stagnation point regime.A theoretical work has been done to analyze the thermal effect of gas blowing due to thermal ablation of surface material on the head of a general hypersonic *** deriving the formulation,research takes into account the effect of gas blowing on the thermal dynamics balance,and then solves them by numerical *** is found that gas blowing will increase the temperature and heat flux at the surface of stagnation point regime.

关键词： Stagnation point flow Viscous compression of fluid parcel gas blowing

Mechanism of boron removal from Si-Al melt by Ar-H_2 gas mixtures

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Transactions of Nonferrous Metals Society of China 2016年第11期26卷 3046-3051页

作者：李京伟白枭龙班伯源何秋湘陈健中国科学院应用技术研究所新型薄膜太阳能电池重点实验室合肥230031

A new method about purification of metallurgical grade silicon （MG-Si） by a combination of Si-Al solvent refining andgas blowing treatment was proposed. The morphologies and transformation of impurity phases, especially for boron and iron in Si-Al melt were investigated during Ar-H2 gas blowing treatment. The mechanism of boron removal was discussed. The resultsindicate that gas blowing can refine grain size and increase nucleation of the primary Si. Boron can be effectively removed fromMG-Si using the Ar-H2 gas blowing technique during the Si-Al solvent refining. Compared with the sample without gas blowing,the removal efficiency of boron increases from 45.83% to 74.73% after 2.5 h gas blowing. The main impurity phases containingboron are in the form of TiB2, AlB2 and VB compounds and iron-containing one is in the form of β-Al5FeSi intermetallic *** of boron combines [H] to transform into gas BxHy （BH, BH2） and diffuses towards the surface of the melt and is volatilized byAr-H2 gas blowing treatment under electromagnetic stirring.

关键词： metallurgical grade silicon Si-Al melt gas blowing boron removal

Removal of phosphorus from metallurgical grade silicon by Ar-H_2O gas mixtures

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Transactions of Nonferrous Metals Society of China 2013年第11期23卷 3470-3475页

作者：李峰邢鹏飞李大纲庄艳歆涂赣峰东北大学材料与冶金学院沈阳110004

The removal of phosphorus in metallurgical grade silicon （MG-Si） by water vapor carried with high purity argon was examined. The effect of the nozzle types, refining time, refining temperature, refining gas temperature and refining gas flow rate on the phosphorus removed was investigated by the self-designed gas blowing device. The optimal refining conditions are nozzle type of holes at bottom and side, refining time of 3 h, refining temperature of 1793 K, refining gas temperature of 373 K, refining gas flow rate of 2 L/min. Under these optimal conditions, the phosphorus content in MG-Si is reduced from 94×10^-6 initially to 11×10-6 （mass fraction）, which indicates that gas blowing refining is very effective to remove phosphorus in MG-Si.

关键词： metallurgical grade silicon gas blowing phosphorus thermodynamics