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Gao J.-T.,University of Science and Technology Beijing | Zhou C.-F.,Beijing Metallurgical Equipment Research and Design Corporation Ltd. | Zhu R.,University of Science and Technology Beijing | Liu R.-Z.,University of Science and Technology Beijing
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

To solve the urgent problems in the thermal system at the initial stage of producing direct reduced iron (DRI) in a rotary hearth furnace (RHF) in China, thermal parameters in different sections of RHF were analyzed by systematic analysis, thermal simulation experiments, and numerical simulation. The RHF mathematical model and heat supply model were established with 83 variables and 20 parameters. The result of numerical simulation indicates that producing every 1 t metalized pellet needs 1213 kg iron ore fines, 283 kg pulverized coal, and 615 kg coal gas. Based on the systematic analysis on different sections of the rotary hearth furnace, thermal simulation experiments on preheating, heating, and reducing sections were studied separately. Under different conditions (nC:nO=0.8~1.2), the real-time reduction progresses of carbon-bearing pellets in these sections were confirmed. According to the matching of the self-reduction decalescence of carbon-bearing pellets and thermal parameters, the fuel supply parameters of each section were determined. Fluent simulation software was used to verify the thermal parameters of the three sections. And the results show that the designed parameters are reasonable, and can effectively implement the functions of all the sections of a rotary hearth furnace, which provide the theoretical basis for the optimization design of the rotary hearth furnace.


Yang X.-M.,CAS Institute of Process Engineering | Zhao W.-J.,University of Science and Technology Beijing | Zhao W.-J.,Beijing Metallurgical Equipment Research and Design Corporation Ltd. | Guo H.-J.,University of Science and Technology Beijing | And 2 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2010

A thermodynamic model of calculating mass action concentrations for structural units or ion couples in NaClO4-H2O and NaF-H2O binary solutions and NaClO4-NaF-H2O ternary strong electrolyte aqueous solutions was developed based on the ion and molecule coexistence theory (IMCT). A transformation coefficient was needed to compare the calculated mass action concentration and the reported activity, because they were usually obtained at different standard states and concentration units. The results show that transformation coefficients between the calculated mass action concentrations and the reported activities of the same components change in a very narrow range. The transformed mass action concentrations of structural units or ion couples in NaClO4-H 2O and NaF-H2O binary solutions agree well with the reported activities. The transformed mass action concentrations of structural units or ion couples in NaClO4-NaF-H2O ternary solution are also in good agreement with the reported activities in a total ionic strength range from 0.1 to 0.9 mol/kg H2O by the 0.1 mol/kg step with different ionic strength fractions of 0, 0.2, 0.4, 0.5, 0.6, 0.8, and 1, respectively. The results indicate that the developed thermodynamic model can reveal the structural characteristics of binary and ternary strong electrolyte aqueous solutions, and the calculated mass action concentrations of structural units or ion couples also strictly follow the mass action law. © 2010 Journal Publishing Center of University of Science and Technology Beijing and Springer Berlin Heidelberg.


Dong K.,University of Science and Technology Beijing | Zhu R.,University of Science and Technology Beijing | Liu R.-Z.,University of Science and Technology Beijing | Wang H.,University of Science and Technology Beijing | Zhou C.-F.,Beijing Metallurgical Equipment Research and Design Corporation Ltd.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

In order to explore the metallurgical behavior of bottom blowing CO2 in ladle furnace, CO2 was used during the LF refining process, some thermodynamics calculation of bottom blowing CO2 was studied, and some exploratory experiments were conducted with different proportions of CO2 to Ar during the LF refining process in industry. The results show that it can cause the little oxidation of C in molten steel with the process of bottom blowing CO2, the average oxidation of C is from 0.3 to 0.8 kg. Compared with bottom blowing Ar, the types and composition of inclusions have less change and the equal yield density of inclusions decreases and the cleanness of steel is improved, it will not aggravate the erosion of ventilated bricks of LF. So it is possible to use CO2 in LF for refining.


Dong K.,University of Science and Technology Beijing | Liu R.-Z.,University of Science and Technology Beijing | Wang R.,University of Science and Technology Beijing | Liu W.-J.,University of Science and Technology Beijing | Zhou C.-F.,Beijing Metallurgical Equipment Research and Design Corporation Ltd.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

A water model was established by the ratio of 1:2 to simulate bottom blowing of N2 in a 2t EAF in the CISC's ferrovanadium plant, the influences of different blowing positions and different blowing quantities to the mixing time and flow pattern were mainly investigated through orthogonal analysis. The result shows that the various bottom-blowing patterns and blowing quantities have greatly influence on the molten pool mixing. With orthogonal analysis on the experimental data, it is found that the mixing effect of the blowing gas to the bath is the strongest, the mixing time is the shortest and distribution of flow is reasonable, when the blowing holes is e-b-d and blowing quantity is 1092 L·min-1.


Yang X.-M.,CAS Institute of Process Engineering | Zhao W.-J.,University of Science and Technology Beijing | Zhao W.-J.,Beijing Metallurgical Equipment Research and Design Corporation Ltd. | Chai G.-M.,University of Science and Technology Beijing | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011

A universal thermodynamic model of calculating mass action concentrations for structural units or ion couples in ternary and binary strong electrolyte aqueous solution was developed based on the ion and molecule coexistence theory and verified in four kinds of binary aqueous solutions and two kinds of ternary aqueous solutions. The calculated mass action concentrations of structural units or ion couples in four binary aqueous solutions and two ternary solutions at 298.15 K have good agreement with the reported activity data from literatures after shifting the standard state and concentration unit. Therefore, the calculated mass action concentrations of structural units or ion couples from the developed universal thermodynamic model for ternary and binary aqueous solutions can be applied to predict reaction ability of components in ternary and binary strong electrolyte aqueous solutions. It is also proved that the assumptions applied in the developed thermodynamic model are correct and reasonable, i.e., strong electrolyte aqueous solution is composed of cations and anions as simple ions, H2O as simple molecule and other hydrous salt compounds as complex molecules. The calculated mass action concentrations of structural units or ion couples in ternary and binary strong electrolyte aqueous solutions strictly follow the mass action law. © 2011 The Nonferrous Metals Society of China.

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