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Numerical Simulation of Innovative Operation of Blast Furnace Based on Multi-Fluid Model

Journal of Iron and Steel Research International 2006年第6期13卷 8-15页

作者： CHU man-sheng YANG Xue-feng shen feng-man YAGI jun-ichiro NOGAMI Hiroshi Institute of Ferrous Metallurgy Northeastern University Shenyang 110004 Liaoning China School ofResource Processing and Bio-Engineering Central South University Changsha 410083 Hunan China Institute of Multidiseiplinary Research for Advanced Materials Tohoku University Sendal 980-8577 Japan

A multi-fluid blast furnace model was simply introduced and was used to simulate several innovative ironmaking operations. The simulation results show that injecting hydrogen bearing materials, especially injecting natural gas and plastics, the hydrogen reduction is enhanced, and the furnace performance is improved simultaneously. Total heat input shows obvious decrease due to the decrease of heat consumption in direct reduction, solution loss and silicon transfer reactions. If carbon composite agglomerates are charged into the furnace, the temperature of thermal reserve zone will obviously decrease, and the reduction of iron-bearing burden materials will be retarded. However, the efficiency of blast furnace is improved just due to the decrease in heat requirements for solution loss, sinter reduction, and silicon transfer reactions, and less heat loss through top gas and furnace wall. Finally, the model is used to investigate the performance of blast furnace under the condition of top gas recycling together with plastics injection, cold oxygen blasting and carbon composite agglomerate charging. The lower furnace temperature, extremely accelerated reduction rate, drastically decreased CO2 emission and remarkably enhanced heat efficiency were obtained by using the innovative operations, and the blast furnace operation with superhigh efficiency can be realized.

关键词： blast furnace innovative ironmaking technology multi-fluid blast furnace model

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Multi-Objective Optimization and Analysis Model of Sintering Process Based on BP Neural Network

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Journal of Iron and Steel Research International 2007年第2期14卷 1-5页

作者： ZHANG Jun-hong XIE An-guo shen feng-man Anshan University of Science and Technology Anshan 114044 Liaoning Chinas Institute of Ferrous Metallurgy Northeastern University Shenyang 110004 Liaoning China

A multi-objective optimization and analysis model of the sintering process based on BP neural network is presented. Genetic algorithms are combined to simplify the BP neural network, which can reduce the learning time and increase the forecasting accuracy of the network model. This model has been experimented in the sintering process, and the production cost, the energy consumption, the quality （revolving intensity）, and the output are considered at the same time. Moreover, the relation between some factors and the multi-objectives has been analyzed, and the results are consistent with the process. Different objectives are emphasized at different practical periods, and this can provide a theoretical basis for the manager.

关键词： BP neural network multi-objective optimization sinter

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Granule Size Distribution and Porosity of Granule Packing

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Journal of Iron and Steel Research International 2008年第5期15卷 1-5页

作者： DAI Shu-hua shen feng-man YU Ai-bing School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China School of Raw Material Science and Engineering University of New Southern Wales Sydney NSW2052 Australia

The granule size distribution and the porosity of the granule packing process were researched. For realizing the optimizing control of the whole sintering production process, researchers must know the factors influencing the granule size distribution and the porosity. Therefore, tests were carried out in the laboratory with regard to the influences of the size and size distribution of raw materials and the total moisture content on the size and size distribution of granule. Moreover, tests for finding out the influences of the moisture content and the granule volume fraction on the porosity were also carried out. The results show that （1） the raw material has little influence on granulation when its size is in the range of 0. 51 mm to 1.0 mm; （2） the influence of the material size on granule size plays a dominant role, and in contrast, the moisture content creates a minor effect on granule size; （3） in binary packing system, with the increase in the constituent volume fraction, the porosity initially increases and then decreases, and there is a minimum value on the porosity curve of the binary mixture system; （4） the minimum value of the porosity in binary packing system occurs at different locations for different moisture contents, and this value shifts from right to left on the porosity curve with increasing the moisture content; （5） the addition of small granules to the same size component cannot create a significant influence on the porosity, whereas the addition of large granules to the same system can greatly change the porosity.

关键词： granule raw material size distribution granulation granule packing porosity

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Numerical Analysis of Blast Furnace Performance Under Charging Iron-Bearing Burdens With High Reducibility

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Journal of Iron and Steel Research International 2007年第2期14卷 13-19页

作者： CHU man-sheng GUO Xian-zhen shen feng-man YAGI Jun-ichiro NOGAMI Hiroshi Institute of Ferrous Metallurgy Northeastern University Shenyang 110004 Liaoning China Ironmaking Plant Anyang Steel Company Limited Anyang 455004 Henan China Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai 980-8577 Japan

The reducibility of iron-bearing burdens was emphasized for improving the operation efficiency of blast furnace. The blast furnace operation of charging the burdens with high reducibility has been numerically evaluated using a multi-fluid blast furnace model. The effects of reaction rate constants and diffusion coefficients were investigated separately or simultaneously for clarifying the variations of furnace state. According to the model simulation results, in the upper zone, the indirect reduction of the burdens proceeds at a faster rate and the shaft efficiency is enhanced with the improvement under the conditions of interface reaction and intra-particle diffusion. In the lower zone, direct reduction in molten slag is restrained. As a consequence, CO utilization of top gas is enhanced and the ratio of direct reduction is decreased. It is possible to achieve higher energy efficiency of the blast furnace, and this is represented by the improvement in productivity and the decrease in consumption of reducing agent. The use of high-reducibility burdens contributes to a better performance of blast furnace. More efforts are necessary to develop and apply highreducibility sinter and carbon composite agglomerates for practical application at a blast furnace.

关键词： blast furnace iron-bearing burden reducibility multi-fluid model 3-interface shrinking core model

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General Temperature Computational Method of Linear Heat Conduction Multilayer Cylinder

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Journal of Iron and Steel Research International 2010年第1期17卷 33-37页

作者： CHEN Liang-yu LI Yu shen feng-man XUE Ran School of Mechanical Engineering and Automation Northeastern University Shenyang 110004 Liaoning China School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

According to the axisymmetric heat conduction of monolayer cylinder, a general method was deduced to calculate the axisymmetric temperature of linear heat conduction multilayer cylinder. Four types of boundary conditions were summarized and formulas for each type were derived. Then, a general calculating program was developed. Four temperature formulas could be expressed by a uniform equation, and the intermediate interface temperatures of axisymmetrical linear conduction multilayer cylinder satisfied tridiagonal linear and nonlinear systems of equations, which could be solved with the pursuit method and the Newton＇s method, respectively. With the calculating program, the temperature at any point of linear heat conduction multilayer cylinder could be obtained.

关键词： multilayer cylinder axisymmetric heat conduction temperature linear heat conduction

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Melting Characteristics and Wettability of Binding Phase in Sinter

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Journal of Iron and Steel Research International 2009年第3期16卷 1-5页

作者： shen feng-man LI Guang-sen DING Zhi-min MU Lin School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

The melting characteristics and wettability of the binding phase in high basicity sinter were studied. By changing nCaO∶nFe2O3 （molar ratio of CaO to Fe2O3） as well as the percentage of MgO,SiO2,and Al2O3,the melting characteristics and wettability of the binding phase were discussed. The results indicated that the characteristic melting temperature was the lowest and wettability was the best at nCaO∶nFe2O3=1∶1 （without addition）; the addition of MgO increased the characteristic melting temperature and contact angles; when the percentage of SiO2 or Al2O3 was 3%,the characteristic melting temperature was the lowest,whereas the contact angles increased with an increase in SiO2 and Al2O3 contents.

关键词： sinter binding phase characteristic melting temperature contact angle

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Effect of Hydrogen Addition on Low Temperature Metallurgical Property of Sinter

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Journal of Iron and Steel Research International 2012年第4期19卷 6-10页

作者： MU Lin JIANG Xin GAO Qiang-jian WEI Guo shen feng-man School of Materials and Metallurgy Northeastern University Shenyang 110004 Liaoning China

Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases ***,the effect of hydrogen addition on the low temperature metallurgical property of sinter is still unclear.A detailed investigation was performed on the above *** results are as *** CO is partially replaced by H2,the RDI〈3.15（RDI〈2.8） of sinter decreases with the increase of the H2 content;when the content of H2 increases,the CO,CO2 and N2 decrease proportionally,in this case,RDI〈3.15（RDI〈2.8） of sinter increases with the increase of H2 content;the value of RDI〈3.15（RDI〈2.8） basically depends on the reduction index（Ri）.The experimental data of RDI〈2.8 based on Japanese industrial standard（JIS） are a little higher than the data of RDI〈3.15 based on Chinese industrial standard（CIS） in the same *** addition,for part of CO is replaced by H2：RDI〈2.8=3.38394＋1.1585 RDI〈3.15;for other gases,except H2,are decreased proportionally：RDI〈2.8=17.39678＋0.42922 RDI〈3.15

关键词： sinter hydrogen reduction disintegration index (RDI) metallurgical property

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Effects of MgO Containing Additive on Low-Temperature Metallurgical Properties of Oxidized Pellet

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Journal of Iron and Steel Research International 2013年第7期20卷 25-28页

作者： GAO Qiang-jian shen feng-man WEI Guo JIANG Xin ZHENG Hai-yan School of Materials and Metallurgy Northeastern University

As a main charging form of BF （blast furnace）, pellets play an important role in blast furnace process. However, comparing with sinters, pellets have many disadvantages, such as reduction swelling, low softening and melting temperature and so on. Therefore, the flux pellets have been applied in blast furnace widely, especially MgO containing pellets. The light burned magnesite is applied as MgO containing additive in pellet production. The char- acters of light burned magnesite are explored. Meanwhile, the effects of it on low-temperature metallurgical proper-ties are investigated such as low-temperature reduction degradation index （RDI）, compressive strength （CS） and the reduction swelling index （RSI）. The light burned magnesite calcined at 850 ℃ manifests better grindability, larger specific surface area, and higher hydration activity. It is found that the addition of light burned magnesite can im- prove low-temperature metallurgical properties （RDI, RSI） of the pellets. With the increase of light burned magne-site in pellets, the RSI and RDI decrease gradually; when the proportion of light burned magnesite does not exceed 2.0% in pellets, the CS decreases slightly, but it still surnasses 2689 N. which can still meet the demand of BF.

关键词： MgO containing additive pellet RSI RDI

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Influence and mechanism of Indonesia vanadium titano-magnetite on metallurgical properties of iron ore sinter

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Journal of Central South University 2017年第12期24卷 2805-2812页

作者： GAO Qiang-jian WEI Guo shen Yan-song JIANG Xin ZHENG Hai-yan shen feng-man LIU Chang-sheng School of Metallurgy Northeastern University Shenyang 110819 China School of Chemical Engineering University of New South Wales Sydney 2052 Australia

In order to provide a reliable reference for utilizing Indonesia vanadium titano-magnetite(VTM) in blast furnace(BF) economically, metallurgical properties of iron ore sinter with addition of Indonesia VTM in mixed sintering materials were investigated, including low-temperature reduction degradation index(RDI), reducibility index(RI), and softening/melting properties. Additionally, influenced mechanism of Indonesia VTM on metallurgical properties of sinter was studied. It is found that adding Indonesia VTM in sintering process quickly increases the RDI of sinters, and decreases the RI from 78.02% to 68.43%. Moreover, both beginning temperature(T_4) and final temperature(TD) of softening/melting increase gradually, and cohesive zone temperature range(T_D–T_4) enlarges from 219 oC to 315 oC. As a result, the permeability of cohesive zone gets worse, which is proven by the higher maximum pressure drop(δPmax) in softening/melting experiments. It is concluded that, after comprehensively considering all metallurgical properties mentioned above, the proper proportion of Indonesia VTM in sintering process is proposed in the new raw materials conditions.

关键词： Indonesia vanadium titano-magnetite sinter reduction degradation index reducibility index softening and melting properties

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Rational design of F,N-rich artificial interphase via chemical prelithiation initiation strategy enabling high coulombic efficiency and stable micro-sized SiO anodes

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Journal of Energy Chemistry 2024年第5期92卷 224-232页

作者： Quanyan man Hengtao shen Chuanliang Wei Baojuan Xi shenglin Xiong Jinkui feng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061ShandongChina School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100ShandongChina

Silicon monoxide(SiO)is regarded as a potential candidate for anode materials of lithium-ion batteries(LIBs).Unfortunately,the application of SiO is limited by poor initial Coulombic efficiency(ICE)and unsteady solid electrolyte interface(SEI),which induce low energy,short cycling life,and poor rate *** address these drawbacks of SiO,we achieve in-situ construction of robust and fast-ion conducting F,N-rich SEI layer on prelithiated micro-sized SiO(P-μSiO)via the simple and continuous treatment ofμSiO in mild lithium 4,4′-dimethylbiphenyl solution and nonflammable hexafluorocyclotriphosphazene *** prelithiation eliminates irreversible capacity through pre-forming inactive lithium ***,the symbiotic F,N-rich SEI with good mechanical stability and fast Li^(+)permeability is conductive to relieve volume expansion ofμSiO and boost the Li+diffusion ***,the P-μSiO realizes an impressive electrochemical performance with an elevated ICE of 99.57%and a capacity retention of 90.67%after 350 ***,the full cell with P-μSiO anode and commercial LiFePO_(4) cathode displays an ICE of 92.03%and a high reversible capacity of 144.97 mA h g^(-1).This work offers a general construction strategy of robust and ionically conductive SEI for advanced LIBs.

关键词： Chemical prelithiation Silicon monoxide SEI Lithium-ion batteries Interphase engineering

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