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Study on Absorption Rate by Eccentric Mechanical Stirring in Gas Injection Refining for Iron and Steel Making

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Journal of Iron and Steel Research International 2011年第S2期18卷 166-171页

作者： masamichi sano Nagoya University

In gas injection refining processes, a great amount of gas is injected into molten metal in short time, so that very large bubbles are inevitably formed. Wide dispersion of small bubbles in the bath is indispensable for high refining efficiency. Eccentric mechanical stirring with unidirectional impeller rotation was tested using a water model for pursuing better bubble disintegration and dispersion. Absorption rate are used to research on the influence law of the bubble dispersion and disintegration and gas-liquid absorption by the influence of, rotation mode, rotation speed and gas flow rate. Compared to the experimental results of absorption rate under eccentric stirring and centric stirring ,provide the scientific experimental and theoretical guidance for high-temperature experiment of hot metal desulfurization .According to experimental and theoretical analysis, this paper has studied various factors effecting on gas absorption process and volumetric mass transfer coefficient using the system of *** results show that:the volumetric mass transfer coefficient and absorption efficiency of CO2 can be increased under eccentric stirring mode, Because bubble disperse quickly with eccentric mechanical stirring, which results in promoting complete reaction between CO2 and NaOH, and improving the mass transfer coefficient and absorption. Volumetric mass transfer coefficient and efficiency of CO2 increase with the increasing rotation speed under the condition of eccentric stirring .But volumetric mass transfer coefficient and efficiency of CO2 decrease with the increasing rotation speed under the condition of centric stirring.

关键词： eccentric stirring bubble dispersion bubble disintegration volumetric mass transfer coefficient efficiency of CO2

Bubble behavior in cylindrical and square vessels under centric mechanical stirring

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Journal of Iron and Steel Research International 2021年第10期28卷 1243-1250页

作者： Kun Wang Yan Liu masamichi sano Ting-an Zhang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Department of Materials Processing Engineering Nagoya UniversityNagoya464-8601Japan

Water model experiments were carried out to investigate the bubble behavior in cylindrical and square vessels under centric mechanical *** bubble behavior in the square vessel was investigated in detail by using a high-speed camera to record the transient images of the *** image analysis software was used to obtain the bubble *** results showed that the centric mechanical stirring in the square vessel was suitable for breakage and dispersion of bubbles,but not suitable for that in the cylindrical *** the impeller blade length and impeller rotation speed was beneficial to disintegrate and disperse bubbles *** bubble diameter decreased with the increase in the Weber number and increased slightly with the increase in the modified Froude *** dimensionless correlation equation of bubble diameter was obtained by the dimensional analysis method.

关键词： Gas injection refining Mechanical stirring Mg desulfurization Bubble breakage Bubble dispersion Dimensional analysis

Improvement of Impeller Blade Structure for Gas Injection Refining under Mechanical Stirring

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Journal of Iron and Steel Research International 2014年第2期21卷 135-143页

作者： Yan LIU Zi-mu ZHANG sano masamichi Jun ZHANG Pin SHAO Ting-an ZHANG Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern University Nagoya University

Abstract： The impeller blade structure for gas injection refining under mechanical stirring has been explored by water model experiments. A sloped swept-back blade impeller is＇proposed for the purpose. The central part of the impeller is disk- or plate-shaped, and the blades are fitted to the side of the disk or plate. In addition, a disk is put on the top side of the impeller blades. The impeller can strengthen the radial and downward flow between the blades and weaken the swirl flow in the zone above the impeller. These effects on flow phenomena are favorable for disintegration and wide dispersion of bubbles which are injected from a nozzle attached to the center of the underside of the impeller. In addition, the sloped swept-back impeller requires less power consumption. The impeller shaft should be placed away from the vessel center so as to disperse the injected bubbles widely in the bath under mechanical stirring even with unidi- rectional impeller rotation and without installing baffles. The number of gas holes in the nozzle and the direction of gas injection have a little effect on the bubble disintegration and dispersion in the bath. Highly efficient gas injection refining can be established under the conditions of proper impeller size, larger nozzle immersion depth, larger eccen- tricity and rotation speed of the impeller. The sloped swept back blade impeller can decrease the power consumption and vet improve the bubble disintegration and wide dist^ersion in the bath.

关键词： gas injection refining cold model eccentric mechanical stirring impeller structure power consump-tion bubble disintegration bubble dispersion

Flow fields control for bubble refinement induced by electromagnetic fields

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Journal of Iron and Steel Research International 2022年第4期29卷 575-587页

作者： Lian-yu Wang Ze-yi Liu Ming He Xiao-ming Liu masamichi sano Li-jia Zhao Qiang Wang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

Large bubbles seriously reduce the efficiencies of the interactions between the bubbles and the molten steel,such as energy transfer,momentum transfer,mass transfer and chemical *** reduce the size of the bubbles and increase the gas–liquid interface area,a novel non-intrusive method of bubble refinement was proposed,which only depends on the molten steel flow field controlled by the rotating electromagnetic *** flow fields of the molten steel for bubble refinement were analyzed,and the corresponding bubble refinement was *** was found that the molten steel formed obvious rotating turbulent flow for bubble refinement under the unidirectional rotating electromagnetic ***,the large vortex in the center of the molten pool caused by the rotating flow made the bubbles aggregate and coalesce again,resulting in formation of larger bubbles and gas *** suppress the central vortex formation and enhance the bubble refinement,the forward-reverse rotating electromagnetic field for bubble refinement was *** irregular and chaotic flow occurred repeatedly because of alternating forward and reverse rotating in a short period,so that the turbulent kinetic energy and turbulent dissipation of the flow field always remained at a high level which favors bubble *** a result,the bubble diameter can decrease by more than 50%compared to that without electromagnetic ***,it is important that this non-intrusive kind of bubble refinement method completely avoids the introduction of non-metallic inclusions caused by intrusive configuration.

关键词： Bubble refinement Electromagnetic field Flow field Forward-reverse rotating Bubble Sauter

Cold Model Study on Mg Desulfurization of Hot Metal Under Mechanical Stirring

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Journal of Iron and Steel Research International 2013年第12期20卷 1-6页

作者： LIU Yan ZHANG Zi-mu LIU Jian-nan ZHANG Jun-hua masamichi sano ZHANG Jun Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern University Beijing Institute of Technology Dalian University of Technology Nagoya University

The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble＇s dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers.

关键词： gas injection refining eccentric mechanical stirring bubble disintegration bubble dispersion volumetric mass transfer coefficient Mg desulfurization hot metal

用氧化镁铝热还原原位产生的镁蒸气改善铁水脱氧效率

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钢铁 2003年第Z1期38卷 116-119页

作者： Jiayi SHAN Takashi ITOH Kuniyuki KITAGAWA masamichi sano 名古屋大学名古屋大学名古屋大学名古屋大学

提出了一种用氧化镁铝热还原原位产生的镁蒸气进行铁水脱氧的新方法.建立了反应模型来研究控速机理和镁蒸气的脱氧效率.模型计算结果显示,要获得高脱氧效率,必须控制喷吹气泡中的镁蒸气压力.

关键词：脱氧铁水镁蒸气铝热还原洁净钢

IMPROVEMENT ON DEOXIDATION EFFICIENCY OF MOLTEN IRON WITH MAGNESIUM VAPOR PRODUCED IN-SITU BY ALUMINOTHERMIC REDUCTION OF MAGNESIA

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IMPROVEMENT ON DEOXIDATION EFFICIENCY OF MOLTEN IRON WITH MA...

Enhancement of Absorption of Injected Gas in New Type Mechanical Stirring Injection Refine Equipment

International Symposium on Global Environment and Steel Industry(ISES’03)

作者： Jiayi SHAN Takashi ITOH Kuniyuki KITAGAWA masamichi sano Research Center for Advanced Energy Conversion Nagoya University Japan Research Center for Advanced Energy Conversion Nagoya University Japan Research Center for Advanced Energy Conversion Nagoya University Japan Professor Emeritus of Nagoya University Japan

＜正＞A novel method of the deoxidation of the molten iron has been proposed with in-situ production of the magnesium vapor by aluminothermic reduction of magnesia. A reaction model has been developed to examine the rate controlling mechanism and highly efficient deoxidation with the magnesium vapor. The model calculation results show that, in order to achieve the high efficiency, control of the magnesium vapor pressure in the injected bubble is essential.

关键词： deoxidation molten iron magnesium vapor aluminothermic reduction clean steel.

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Enhancement of Absorption of Injected Gas in New Type Mechan...

Mechanical stirring for highly efficient gas injection refining

2011 International Conference on Fuzzy Systems and Neural Computing(FSNC 2011)

作者： Zhang TingAn Liu Yan Wang qiang He JiCheng masamichi sano School of material and metallurgy Northeastern University Nogoya University

The bubble disintegration is of great scientific importance in metal refining, In order for further improvement, Research on bubble disintegration and dispersion becomes necessary, The intensification of bubble disintegration experiment that we have done in cold water model by study absorption rate,The purpose is to research bubble disintegration under difference experimental condition. In this paper, we use mass transfer coefficients stand for absorption rate, we also study utilization rate, we want to research the best experimental condition which can enhance mass transfer coefficients and utilization rate. On the basis of experimental result, Provided a scientific and experimental basis to high-temperature experiment of bubble dispersion and *** results show:the rate of absorption of CO2 injected in aqueous Na OH solution can be increased greatly by mechanical stirring when the positive-reverse rotation mode is adopted. Dispersion of small bubbles in the liquid is very effective for increasing the absorption rate.

关键词： bubble disintegration and dispersion absorption rate injection refine

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Transactions of Nonferrous Metals Society of China 2011年第8期21卷 1896-1904页

作者：刘燕张廷安佐野正道王强任晓冬赫冀成东北大学材料与冶金学院多金属共生矿生态化利用教育部重点实验室沈阳110006 日本名古屋大学

In gas injection refining processes,wide dispersion of small bubbles in the bath is indispensable for high refining *** mechanical stirring with unidirectional impeller rotation was tested using a water model for pursuing better bubble disintegration and *** of various factors on bubble disintegration and dispersion were *** factors were stirring mode,eccentricity and rotation speed,nozzle structure,nozzle immersion depth,and gas flow *** injection from a nozzle at the end of the impeller shaft and from an immersed lance was *** eccentric stirring,a vortex was formed away from the *** bubbles were produced in the strong turbulence or high shear stress field near the rotating impeller and moved in the direction to the vortex keeping up with the macroscopic flow induced by the mechanical *** small bubbles could disperse widely in the bath under eccentric stirring with unidirectional rotation.

关键词： gas injection refining eccentric mechanical stirring unidirectional impeller rotation bubble dispersion bubble disintegration macroscopic flow